若狭雅信(理工学研究科物質科学部門)

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若狭　雅信（ワカサ　マサノブ）
理工学研究科物質科学部門教授
理学部基礎化学科学部長

研究者情報

■ 研究分野

自然科学一般, 生物物理、化学物理、ソフトマターの物理

業績情報

■ 論文

Anthropogenic CO₂ emission estimates in the Tokyo metropolitan area from ground-based CO₂ column observations
Hirofumi Ohyama; Matthias M. Frey; Isamu Morino; Kei Shiomi; Masahide Nishihashi; Tatsuya Miyauchi; Hiroko Yamada; Makoto Saito; Masanobu Wakasa; Thomas Blumenstock; Frank Hase
Atmospheric Chemistry and Physics, 巻：23, 号：23, 開始ページ：15097, 終了ページ：15119, 2023年12月, ［査読有り］
Abstract. Urban areas are responsible for more than 40 % of global energy-related carbon dioxide (CO2) emissions. The Tokyo metropolitan area (TMA), Japan, one of the most populated regions in the world, includes various emission sources, such as thermal power plants, automobile traffic, and residential facilities. In order to infer a top–down emission estimate, we conducted an intensive field campaign in the TMA from February to April 2016 to measure column-averaged dry-air mole fractions of CO2 (XCO2) with three ground-based Fourier transform spectrometers (one IFS 125HR and two EM27/SUN spectrometers). At two urban sites (Saitama and Sodegaura), measured XCO2 values were generally larger than those at a rural site (Tsukuba) by up to 9.5 ppm, and average diurnal variations increased toward evening. To simulate the XCO2 enhancement (ΔXCO2) resulting from emissions at each observation site, we used the Stochastic Time-Inverted Lagrangian Transport (STILT) model driven by meteorological fields at a horizontal resolution of ∼1 km from the Weather Research and Forecasting (WRF) model, which was coupled with anthropogenic (large point source and area source) CO2 emissions and biogenic fluxes. Although some of the diurnal variation of ΔXCO2 was not reproduced and plumes from nearby large point sources were not captured, primarily because of a transport modeling error, the WRF–STILT simulations using prior fluxes were generally in good agreement with the observations (mean bias, 0.30 ppm; standard deviation, 1.31 ppm). By combining observations with high-resolution modeling, we developed an urban-scale inversion system in which spatially resolved CO2 emission fluxes at >3 km resolution and a scaling factor of large point source emissions were estimated on a monthly basis by using Bayesian inference. The XCO2 simulation results from the posterior CO2 fluxes were improved (mean bias, −0.03 ppm; standard deviation, 1.21 ppm). The prior and posterior total CO2 emissions in the TMA are 1.026 ± 0.116 and 1.037 ± 0.054 Mt-CO2 d−1 at the 95 % confidence level, respectively. The posterior total CO2 emissions agreed with emission inventories within the posterior uncertainty, demonstrating that the EM27/SUN spectrometer data can constrain urban-scale monthly CO2 emissions.
Copernicus GmbH, 研究論文（学術雑誌）
DOI：https://doi.org/10.5194/acp-23-15097-2023
DOI ID：10.5194/acp-23-15097-2023, eISSN：1680-7324

Triplet–Triplet Annihilation via the Triplet Channel in Crystalline 9,10-Diphenylanthracene
Tomoaki Yago; Manami Tashiro; Kiichi Hasegawa; Masao Gohdo; Syuta Tsuchiya; Tadaaki Ikoma; Masanobu Wakasa
The Journal of Physical Chemistry Letters, 巻：13, 号：37, 開始ページ：8768, 終了ページ：8774, 2022年09月, ［査読有り］, ［最終著者, 責任著者］
American Chemical Society (ACS), 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/acs.jpclett.2c01839
DOI ID：10.1021/acs.jpclett.2c01839, ISSN：1948-7185, eISSN：1948-7185

Singlet Fission in Solid 1,6-Diphenyl-1,3,5-hexatriene Dicarboxylic Acids and Esters: Effects of Meta and Para Substitution　　　　　　　　　　　　　　　
Yoriko Sonoda; Ryuzi Katoh; Norimitsu Tohnai; Tomoaki Yago; Masanobu Wakasa
JOURNAL OF PHYSICAL CHEMISTRY C, 巻：126, 号：20, 開始ページ：8742, 終了ページ：8751, 2022年05月, ［査読有り］, ［最終著者］
As an exciton multiplication process, singlet fission (SF) can potentially increase the energy conversion efficiency of solar cells and other optoelectronic devices. (E,E,E)-1,6-Diphenyl-1,3,5-hexatriene (DPH) is an air-stable SF-active chromophore having a triplet state of higher energy and longer lifetime compared with those of tetracenes and pentacenes. However, functionalization of DPH molecule by the introduction of substituents has not been fully studied yet. In this work, DPH dicarboxylic acids and esters substituted in the meta and para positions of the phenyl rings were prepared to investigate the effects of position isomerism on energetics, molecular arrangements, and solid-state SF properties. We discovered that all four trienes were SF materials. For both the acid and ester, the meta isomers exhibit faster SF and more efficient triplet diffusion than the para isomers as shown by steady-state and time-resolved fluorescence measurements with and without a magnetic field. Crystallographic analysis reveals that molecules of meta ester are arranged to form slipped-parallel stacks, whereas those of the para ester are stacked in a herringbone fashion. The better SF properties, namely the faster SF and more efficient triplet diffusion, brought about by meta substitution can be attributed to more suitable energetics and more favorable molecular arrangements for SF to occur. We also found that propionic acid DPH (PA-DPH), a commercial fluorescence probe for biomembrane studies, underwent SF in the solid state.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/acs.jpcc.2c01474
DOI ID：10.1021/acs.jpcc.2c01474, ISSN：1932-7447, eISSN：1932-7455, Web of Science ID：WOS:000820430400001

Low magnetic field effects on a photoinduced electron transfer reaction in an ionic liquid　　　　　　　　　　　　　　　
Nanshi Harada; Taisuke Matsuo; Tomoaki Yago; Kiminori Maeda; Masanobu Wakasa
Chemical Physics Letters, 巻：773, 開始ページ：138569, 終了ページ：138569, 2021年03月, ［査読有り］, ［最終著者, 責任著者］
Elsevier {BV}, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/j.cplett.2021.138569
DOI ID：10.1016/j.cplett.2021.138569, ISSN：0009-2614, ORCID：106571386

Geminate Delayed Fluorescence by Anisotropic Diffusion-Mediated Reversible Singlet Fission and Triplet Fusion　　　　　　　　　　　　　　　
Kazuhiko Seki; Tomomi Yoshida; Tomoaki Yago; Masanobu Wakasa; Ryuzi Katoh
The Journal of Physical Chemistry C, 巻：125, 号：6, 開始ページ：3295, 終了ページ：3304, 2021年02月, ［査読有り］
American Chemical Society ({ACS}), 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/acs.jpcc.0c10582
DOI ID：10.1021/acs.jpcc.0c10582, ORCID：88196688

Diffusion of Radical Ions in Ionic Liquids Having Long Alkyl Chains　　　　　　　　　　　　　　　
Tsuchida, Hikaru; Takeda, Tomoya; Ishii, Yuya; Yago, Tomoaki; Wakasa, Masanobu
The Journal of Physical Chemistry B, 2019年09月, ［査読有り］, ［最終著者, 責任著者］
研究論文（学術雑誌）
DOI：https://doi.org/10.1021/ACS.JPCB.9B06007
DOI ID：10.1021/ACS.JPCB.9B06007, ORCID：89742478, Web of Science ID：WOS:000490354600011

Exploring the Structure of an Exchange-Coupled Triplet Pair Generated by Singlet Fission in Crystalline Diphenylhexatriene: Anisotropic Magnetic Field Effects on Fluorescence in High Fields　　　　　　　　　　　　　　　
Ishikawa Kei; Yago Tomoaki; Wakasa Masanobu
JOURNAL OF PHYSICAL CHEMISTRY C, 巻：122, 号：39, 開始ページ：22264, 終了ページ：22272, 2018年09月, ［査読有り］, ［最終著者, 責任著者］
DOI：https://doi.org/10.1021/acs.jpcc.8b06026
DOI ID：10.1021/acs.jpcc.8b06026, ISSN：1932-7447, Web of Science ID：WOS:000446926400005

Structure and dynamics of triplet-exciton pairs generated from singlet fission studied via magnetic field effects　　　　　　　　　　　　　　　
Masanobu Wakasa; Tomoaki Yago; Yoriko Sonoda; Ryuzi Katoh
Communications Chemistry, 巻：1, 開始ページ：1, 終了ページ：6, 2018年03月, ［査読有り］, ［筆頭著者, 責任著者］
英語, 研究論文（学術雑誌）

A spin exchange model for singlet fission　　　　　　　　　　　　　　　
Yago Tomoaki; Wakasa Masanobu
CHEMICAL PHYSICS LETTERS, 巻：695, 開始ページ：240, 終了ページ：244, 2018年02月, ［査読有り］, ［最終著者］
DOI：https://doi.org/10.1016/j.cplett.2018.02.025
DOI ID：10.1016/j.cplett.2018.02.025, ISSN：0009-2614, Web of Science ID：WOS:000427386500038

Singlet Fission in Fluorinated Diphenylhexatrienes　　　　　　　　　　　　　　　
Ryuzi Katoh; Masaaki Hashimoto; Akinori Takahashi; Yoriko Sonoda; Tomoaki Yago; Masanobu Wakasa
JOURNAL OF PHYSICAL CHEMISTRY C, 巻：121, 号：46, 開始ページ：25666, 終了ページ：25671, 2017年10月, ［査読有り］, ［最終著者, 責任著者］
Experimentally determined quantum yields, decay profiles, and magnetic field effects on fluorescence showed that fluorinated derivatives of diphenylhexatriene were singlet fission materials. The rate constant of singlet fission was estimated as a function of temperature from the initial rate of decay of the fluorescence profiles. The origin of the temperature dependence was discussed in relation to the molecular stacking structure of the crystals.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/acs.jpcc.7b06905
DOI ID：10.1021/acs.jpcc.7b06905, ISSN：1932-7447, Web of Science ID：WOS:000416496200007

Magnetic Field Effects on Triplet Pair Generated by Singlet Fission in an Organic Crystal: Application of Radical Pair Model to Triplet Pair　　　　　　　　　　　　　　　
Tomoaki Yago; Kei Ishikawa; Ryuzi Katoh; Masanobu Wakasa
JOURNAL OF PHYSICAL CHEMISTRY C, 巻：120, 号：49, 開始ページ：27858, 終了ページ：27870, 2016年11月, ［査読有り］, ［最終著者, 責任著者］
Magnetic field effects (MFEs) on triplet pairs generated by singlet fission (SF) in an organic crystal, 1,6diphenyl-1,3,5-hexatriene, were studied by steady-state fluorescence measurements under ultrahigh magnetic fields of up to 10 T and by time-resolved fluorescence measurements with subnanosecond time resolution in the presence of magnetic field of 0.5 T. The observed MFEs were analyzed by using the stochastic Liouville equation based on the radical pair model with a modification of the spin Hamiltonian. Excellent agreements between the observed and the simulated MFEs demonstrate that the radical pair model used in the present study can apply to analysis of MFEs on triplet pairs generated by SF in organic materials. Model calculations were performed generated in the triplet pairs. The magnitude of the exchange from the observation of the MFE generated in the triplet pairs. The magnitude of the exchange from the observation of the MFE caused by the level crossing mechanism. We also determined the structure of the correlated triplet pair generated by the SF in 1,6-diphenyl-1,3,5-hexatriene crystal.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/acs.jpcc.6b09570
DOI ID：10.1021/acs.jpcc.6b09570, ISSN：1932-7447, Web of Science ID：WOS:000390072100014

What Can Be Learned from Magnetic Field Effects on Singlet Fission:Role of Exchange Interaction in Excited Triplet Pairs　　　　　　　　　　　　　　　
Masanobu Wakasa; Mana Kaise; Tomoaki Yago; Ryuzi Katoh; Yusuke Wakikawa; Tadaaki Ikoma
J. Phys. Chem. C, 巻：119, 開始ページ：25840, 終了ページ：25844, 2015年10月, ［査読有り］, ［筆頭著者, 責任著者］
英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/acs.jpcc.5b10176
DOI ID：10.1021/acs.jpcc.5b10176

Photocyclization Reactions of Diarylethenes via the Excited Triplet State　　　　　　　　　　　　　　　
Murata Ryutaro; Yago Tomoaki; Wakasa Masanobu
JOURNAL OF PHYSICAL CHEMISTRY A, 巻：119, 号：45, 開始ページ：11138, 終了ページ：11145, 2015年10月, ［査読有り］, ［最終著者, 責任著者］
DOI：https://doi.org/10.1021/acs.jpca.5b08205
DOI ID：10.1021/acs.jpca.5b08205, ISSN：1089-5639, Web of Science ID：WOS:000364435300012

Time-Resolved Detection of Magnetic Field Effects on Radical Pairs in Micelles: Two-Step Two-Laser Fluorescence Spectroscopy of Transient Radicals　　　　　　　　　　　　　　　
Yago Tomoaki; Takashino Ayuto; Wakasa Masanobu
JOURNAL OF PHYSICAL CHEMISTRY C, 巻：119, 号：34, 開始ページ：20217, 終了ページ：20223, 2015年08月, ［査読有り］, ［最終著者, 責任著者］
DOI：https://doi.org/10.1021/acs.jpcc.5b07524
DOI ID：10.1021/acs.jpcc.5b07524, ISSN：1932-7447, Web of Science ID：WOS:000360415700078

Erratum: A practical approach to calculate the time evolutions of magnetic field effects on photochemical reactions in nano-structured materials(Phys. Chem. Chem. Phys. (2015) 10.1039/c5cp00595g)　　　　　　　　　　　　　　　
Tomoaki Yago; Masanobu Wakasa
Physical Chemistry Chemical Physics, 巻：17, 号：18, 開始ページ：12366, 2015年04月, ［査読有り］, ［責任著者］
Royal Society of Chemistry, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1039/c5cp90061a
DOI ID：10.1039/c5cp90061a, ISSN：1463-9076, SCOPUS ID：84928902428

A practical approach to calculate the time evolutions of magnetic field effects on photochemical reactions in nano-structured materials　　　　　　　　　　　　　　　
Yago Tomoaki; Wakasa Masanobu
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 巻：17, 号：15, 開始ページ：9737, 終了ページ：9747, 2015年03月, ［査読有り］, ［最終著者］
DOI：https://doi.org/10.1039/C5CP00595G
DOI ID：10.1039/C5CP00595G, ISSN：1463-9076, Web of Science ID：WOS:000352270700017

Diffusion and Solvation of Radical Ions in an Ionic Liquid Studied by the MFE Probe　　　　　　　　　　　　　　　
Tomoaki Yago; Yuya Ishii; Masanobu Wakasa
JOURNAL OF PHYSICAL CHEMISTRY C, 巻：118, 号：38, 開始ページ：22356, 終了ページ：22367, 2014年08月, ［査読有り］, ［最終著者, 責任著者］
Magnetic field effects (MFEs) on photoinduced electron transfer reaction between benzophenone (BP) and 1,4-diazabicyclo [2.2.2] octane in an ionic liquid (IL) of N,N,N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl) amide were studied by a nanosecond laser flash photolysis technique. The escape yield of the benzophenone radical anion (BP center dot-) was increased with increasing magnetic field strength (B) of 0 T < B <= 0.1 T and almost saturated at 0.1 T < B <= 1.7 T. The observed MFEs were explained by the hyperfine coupling mechanism (HFCM) and the relaxation mechanism (RM). The large MFEs indicate the nanometer-scaled cage effects on the diffusion of the radical ion pairs (RIP) generated by the photoinduced electron transfer reaction in TMPA TFSA. The cage lifetime for the RIP was estimated to be 170 ns, which is much longer than that previously reported for the neutral radical pairs (<20 ns) in the same IL. In addition to the large MFEs due to the HFCM and the RM, we also observed the MFE caused by the level crossing mechanism (LCM). These results suggest that compared with the neutral radicals, the radical ions are rigidly solvated in the IL and the nanometer-scaled charge-ordering structures are created around the radical ions.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp5069544
DOI ID：10.1021/jp5069544, ISSN：1932-7447, Web of Science ID：WOS:000342396300069

30T強磁場を用いたスピンダイナミクス測定とナノ反応場解析　　　　　　　　　　　　　　　
若狭雅信; 矢後友暁
応用物理, 巻：83, 号：3, 開始ページ：218, 終了ページ：221, 2014年03月, ［査読有り］, ［招待有り］, ［筆頭著者］
日本語, 研究論文（学術雑誌）
DOI：https://doi.org/10.11470/oubutsu.83.3_218
DOI ID：10.11470/oubutsu.83.3_218

Local structure of ionic liquids probed by self-quenching of thiobenzophenone　　　　　　　　　　　　　　　
Miyuki Tanaka; Tomoaki Yago; Masanobu Wakasa
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 巻：15, 号：3, 開始ページ：787, 終了ページ：794, 2012年12月, ［査読有り］, ［最終著者, 責任著者］
Self-quenching of the triplet excited state of thiobenzophenone ((TBP)-T-3*) in molecular solvents, a sodium dodecyl sulfate (SDS) micellar solution, and ionic liquids (ILs) was measured using nanosecond laser flash photolysis. In the molecular solvents and ILs, (TBP)-T-3* single-exponentially decayed, and the decay was accelerated with increasing TBP concentration. Self-quenching rate constants (k(SQ)) obtained in the ILs were smaller than those in the molecular solvents with similar solvent viscosities, indicating that molecular diffusion is inhibited in the ILs. In the SDS micellar solution, the decay of (TBP)-T-3* showed two components. The fast decay component was attributed to self-quenching of (TBP)-T-3* which presents inside micelles containing two or more TBP molecules, while the slow decay component was from deactivation of single (TBP)-T-3*. The decay of (TBP)-T-3* in an IL, N, N, N-trimethyl-N-propylammonium bis(trifluoromethylsulfonyl) amide (TMPA TFSA), had only one decay component, showing that unlike the micelles, the local structure of TMPA TFSA does not have a long lifetime. The cage lifetime of TMPA TFSA was estimated to be between 17 and 20 ns.
ROYAL SOC CHEMISTRY, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1039/c2cp42766d
DOI ID：10.1039/c2cp42766d, ISSN：1463-9076, Web of Science ID：WOS:000312217200008

Cage lifetimes of ionic liquids as studied by the magnetic field effect probe　　　　　　　　　　　　　　　
Tomohide Okada; Tomoaki Yago; Tadashi Takamasu; Masanobu Wakasa
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 巻：14, 号：10, 開始ページ：3490, 終了ページ：3497, 2012年01月, ［査読有り］, ［最終著者, 責任著者］
Magnetic field effects (MFEs) on the photoinduced hydrogen abstraction reaction of benzophenone with phenol were investigated in ionic liquids (ILs) with a short alkyl chain (N,N,N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl) amide (TMPA TFSA)) and long alkyl chains ((N, N, N-trimethyl-N-octylammonium bis(trifluoromethanesulfonyl) amide (TMOA TFSA) and N-decyl-N,N,N-trimethylammonium bis(trifluoromethanesulfonyl) amide (DTMA TFSA)) by a nanosecond laser flash photolysis technique. In each ionic liquid, escaped radical yield of a benzophenone ketyl radical rapidly increased with increasing magnetic field strength (B) of < T o B <= 0.01 T < At 0.01 T < B <= 0.4 T, the escaped radical yield almost saturated in TMPA TFSA or gradually increased in TMOA TFSA and DTMA TFSA. At much higher fields of 0.4 T < B <= 30 T, the yield gradually decreased, resulting in 10-15% decrease at 30 T. The observed MFEs can be explained by the hyperfine coupling and Dg mechanisms together with the relaxation mechanism. On the time profiles of the transient absorption observed for the benzophenone ketyl radical, MFEs were generated in the time range of 0 < t < 0.6 ms. The cage lifetimes of TMOA TFSA and DTMA TFSA were estimated to be at least 120 ns.
ROYAL SOC CHEMISTRY, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1039/c2cp23747d
DOI ID：10.1039/c2cp23747d, ISSN：1463-9076, eISSN：1463-9084, Web of Science ID：WOS:000300314100026

Cyclization Reaction of Diarylethene through the Triplet Excited State　　　　　　　　　　　　　　　
Ryutaro Murata; Tomoaki Yago; Masanobu Wakasa
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 巻：84, 号：12, 開始ページ：1336, 終了ページ：1338, 2011年12月, ［査読有り］, ［最終著者, 責任著者］
Photocyclization reaction of 1,2-bis(2-methyl-3-benzothienyl)perfluorocyclopentene (BT) in methanol was studied by using nanosecond laser flash photolysis at 296 K. When xanthone was used as a triplet sensitizer, the triplet energy transfer occurred efficiently and the closed-ring product of BT was observed.
CHEMICAL SOC JAPAN, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/bcsj.20110212
DOI ID：10.1246/bcsj.20110212, ISSN：0009-2673, eISSN：1348-0634, Web of Science ID：WOS:000298906900005

Photochemical primary process of photo-Fries rearrangement reaction of 1-naphthyl acetate as studied by MFE probe　　　　　　　　　　　　　　　
Masao Gohdo; Tadashi Takamasu; Masanobu Wakasa
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 巻：13, 号：2, 開始ページ：755, 終了ページ：761, 2011年11月, ［査読有り］, ［最終著者, 責任著者］
Photo-Fries rearrangement reactions of 1-naphthyl acetate (NA) in n-hexane and in cyclohexane were studied by the magnetic field effect probe (MFE probe) under magnetic fields (B) of 0 to 7 T. Transient absorptions of the 1-naphthoxyl radical, T-T absorption of NA, and a short-lifetime intermediate (tau = 24 ns) were observed by a nanosecond laser flash photolysis technique. In n-hexane, the yield of escaped 1-naphthoxyl radicals dropped dramatically upon application of a 3 mT field, but then the yield increased with increasing B for 3 mT < B <= 7 T. These observed MFEs can be explained by the hyperfine coupling and the Delta g mechanisms through the singlet radical pair. The fact that MFEs were observed for the present photo-Fries rearrangement reaction indicates the presence of a singlet radical pair intermediate with a lifetime as long as several tens of nanoseconds.
ROYAL SOC CHEMISTRY, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1039/c0cp00077a
DOI ID：10.1039/c0cp00077a, ISSN：1463-9076, eISSN：1463-9084, Web of Science ID：WOS:000285390400048

Magnetic Field Effects on Photochemical Reactions in Ionic Liquids with Short Alkyl Chains　　　　　　　　　　　　　　　
Tomoaki Yago; Atom Hamasaki; Miyuki Tanaka; Tadashi Takamasu; Masanobu Wakasa
JOURNAL OF PHYSICAL CHEMISTRY C, 巻：115, 号：43, 開始ページ：21063, 終了ページ：21071, 2011年09月, ［査読有り］, ［最終著者, 責任著者］
Magnetic field effects (MFEs) on the photoinduced hydrogen abstraction reactions of benzophenone and thiobenzophenone from thiophenol were investigated in several ionic liquids with short alkyl chains by a nanosecond laser flash photolysis technique. In each ionic liquid, escaped radical yields of benzophenone and thiobenzophenone ketyl radicals gradually decreased with increasing magnetic field strength. The observed results were analyzed by using the stochastic Liouville equation (SLE), employing a solvent separated radical pair (SSRP) model where the SSRP with a specific radical-radical distance is stable and has a long lifetime. The SLE analysis revealed that the lifetime of the SSRP and the radical rotation in the SSRP states are strongly correlated with the macroviscosity of the ionic liquids.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp207816t
DOI ID：10.1021/jp207816t, ISSN：1932-7447, Web of Science ID：WOS:000296172800033

Magnetic Field Effects on Hydrogen Abstraction of Thiobenzophenone as a Probe of Microviscosity　　　　　　　　　　　　　　　
Miyuki Tanaka; Tomoaki Yago; Yoshio Sakaguchi; Tadashi Takamasu; Masanobu Wakasa
JOURNAL OF PHYSICAL CHEMISTRY B, 巻：115, 号：9, 開始ページ：1936, 終了ページ：1943, 2011年02月, ［査読有り］, ［最終著者, 責任著者］
Hydrogen abstraction reactions of thiobenzophenone with thiophenol in solutions of varying viscosities (eta = 0.29-42.0 cP) were studied by a nanosecond laser flash photolysis under magnetic fields of 0-15.5 T. In alcoholic solutions, the escaped radical yield (Y) of thiobenzophenone ketyl radical showed appreciable magnetic field effects (MFEs). The observed MFEs can be interpreted with the Delta g mechanism through the triplet radical pair. The relative escaped radical yield (R(1.7T) = Y(1.7T)/Y(0T)) decreased with increasing eta at 0 < eta <= 3.33 cP, but then the yield increased with increasing eta at 3.33 cP <eta <= 2.22 cP. At much higher viscosity, 22.2 cP < eta <= 42 cP, R(1.7T) values become 1.0 within experimental errors. Such quenching of MFE was explained by the spin- orbit coupling recombination of close radical pairs associated with high viscosity. The MFEs on the present reaction is extremely sensitive to the solvent viscosity in the vicinity of the radical pairs. Using this probe reaction, microviscosities of sodium dodecyl sulfate (SDS) and Brij35 micellar solutions were estimated.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp108898a
DOI ID：10.1021/jp108898a, ISSN：1520-6106, Web of Science ID：WOS:000287833000002

Nanoscale Structure of Ionic Liquid and Diffusion Process as Studied by the MFE Probe　　　　　　　　　　　　　　　
Tomoaki Yago; Masanobu Wakasa
JOURNAL OF PHYSICAL CHEMISTRY C, 巻：115, 号：6, 開始ページ：2673, 終了ページ：2678, 2011年01月, ［査読有り］, ［最終著者, 責任著者］
Magnetic field effects (MFEs) observed for photoinduced hydrogen abstract reaction between benzophenone and thiophenol, generating phenylthiyl and benzophenone ketyl radicals, in an ionic liquid of N,N,N,-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl)amide (TMPA TFSA) were analyzed by using the stochastic Liouville equation (SLE) with the cage model and the solvent separated radical pair model, respectively. The MFEs observed on the yield of escaped benzophenone ketyl radical in the range of 0 < B <= 2.0 T were explained by the transverse spin relaxation in the radical pair caused by the large anisotropy of the g-value and the slow rotation of phenylthiyl radical in the IL. The calculated MFE was dependent on a rotational correlation time of the radical as well as the mutual diffusion coefficient for the translational diffusion of the radicals. The SLE analysis revealed that the IL has at least two different viscosity regions, causing the nanoscale cage effect on the radical diffusion in the IL.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp1108762
DOI ID：10.1021/jp1108762, ISSN：1932-7447, Web of Science ID：WOS:000287065700010

Magnetic Field Effects on Photochemical Reaction in Mesoporous Silicates of MCM-41 under High Magnetic Fields up to 5 T　　　　　　　　　　　　　　　
Tomoaki Maeyama; Hiroki Matsui; Tomoaki Yago; Masanobu Wakasa
JOURNAL OF PHYSICAL CHEMISTRY C, 巻：114, 号：50, 開始ページ：22190, 終了ページ：22196, 2010年11月, ［査読有り］, ［最終著者, 責任著者］
Magnetic field effects (MFEs) on photoinduced hydrogen abstraction reaction of xanthone with xanthene were investigated in 2-propanol confined in mesoporous silicates of MCM-41 under high magnetic fields up to 5 T. The observed MFEs were explained by the spin relaxation mechanism associated with the cage effects on diffusion of the radical pairs in nanopores of MCM-41. The qualitative analysis using the stochastic Liouville equation revealed that the motions of the radical pairs are not restricted in the one dimension, although the MCM-41 used in the present study has the one-dimensional pore with the diameter of 1.7 or 2.7 nm. The effective viscosities for rotation of the solute molecule in the pores were estimated to be 5-10 cP.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp107729s
DOI ID：10.1021/jp107729s, ISSN：1932-7447, Web of Science ID：WOS:000285236800042

Fluorescent Spherical Particle Formation from Solid Polysilanes by the Aid of Laser Ablation and Photochemical Reaction
Hiroshi Morita; Yu Aoki; Shigeru Takahara; Masanobu Wakasa
Journal of Photopolymer Science and Technology, 巻：23, 号：3, 開始ページ：371, 終了ページ：378, 2010年06月, ［査読有り］, ［最終著者］
Technical Association of Photopolymers, Japan, 研究論文（学術雑誌）
DOI：https://doi.org/10.2494/photopolymer.23.371
DOI ID：10.2494/photopolymer.23.371, ISSN：0914-9244, eISSN：1349-6336

Photostability of Water-dispersible CdTe Quantum Dots: Capping Ligands and Oxygen　　　　　　　　　　　　　　　
Saim Emin; Alexandre Loukanov; Masanobu Wakasa; Seiichiro Nakabayashi; Yasuko Kaneko
CHEMISTRY LETTERS, 巻：39, 号：6, 開始ページ：654, 終了ページ：656, 2010年05月, ［査読有り］
Here we report the effect of various capping ligands on the optical properties and photostability of CdTe quantum dots in aqueous solutions. Ligand exchange procedure is used to prepare water dispersive CdTe nanocrystals capped with aminoethane-thiol, 3-mercaptopropionic and dihydrolipoic acids. The dynamics of photoexcited states is examined by transient photoluminescent spectroscopy. Our results demonstrate that the luminescence intensity of water-dispersible CdTe quantum dots is strongly influenced by molecular oxygen under light irradiation.
CHEMICAL SOC JAPAN, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/cl.2010.654
DOI ID：10.1246/cl.2010.654, ISSN：0366-7022, eISSN：1348-0715, Web of Science ID：WOS:000279446300050

Hydrogen Bonding Effects on the Reorganization Energy for Photoinduced Charge Separation Reaction between Porphyrin and Quinone Studied by Nanosecond Laser Flash Photolysis　　　　　　　　　　　　　　　
Tomoaki Yago; Masao Gohdo; Masanobu Wakasa
JOURNAL OF PHYSICAL CHEMISTRY B, 巻：114, 号：7, 開始ページ：2476, 終了ページ：2483, 2010年02月, ［査読有り］, ［最終著者］
Alcohol concentration dependences of photoinduced charge separation (CS) reaction of zinc tetraphenylporphyrin (ZnTPP) and duroquinone (DQ) were investigated in benzonitrile by a nanosecond laser flash photolysis technique. The photoinduced CS reaction was accelerated by the addition of alcohols, whereas the addition of acetonitrile caused little effect on the CS reactions. The simple theory was developed to calculate an increase in reorganization energies induced by the hydrogen bonding interactions between DQ and alcohols using the chemical equilibrium constants for the hydrogen bonding complexes through the concerted pathway and the stepwise one. The experimental results were analyzed by using the Marcus equation where we took into account the hydrogen bonding effects on the reorganization energy and the reaction free energy for the CS reaction. The observed alcohol concentration dependence of the CS reaction rates was well explained by the formation of the hydrogen bonding complexes through the concerted pathway, demonstrating the increase in the reorganization energy by the hydrogen bonding interactions.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp909927w
DOI ID：10.1021/jp909927w, ISSN：1520-6106, Web of Science ID：WOS:000274578500019

Reexamination of the Photochemical Primary Process of Photo-Fries Rearrangement Reaction as Studied by MFE Probe　　　　　　　　　　　　　　　
Masao Gohdo; Masanobu Wakasa
CHEMISTRY LETTERS, 巻：39, 号：2, 開始ページ：106, 終了ページ：107, 2010年01月, ［査読有り］, ［最終著者, 責任著者］
A photo-Fries rearrangement reaction of I-naphthyl acetate in n-hexane Was Studied by a nanosecond laser flash photolysis technique under magnetic fields of 0 to 1.65 T. The escaped yield of 1-naphthoxyl radical decreased with increasing magnetic field (B) at 0 < 8 <= 0.005 T, but inversely increased with increasing B at much higher fields of 0.005 T < B <= 1.65 T. Such inverted magnetic field effects (MFEs) can be interpreted with the hyperfine coupling and the Delta g mechanisms through the singlet radical pair. The fact that MFEs are observed for the present photo-Fries rearrangement reaction suggests a singlet radical pair intermediacy with a lifetime as long as several ns.
CHEMICAL SOC JAPAN, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/cl.2010.106
DOI ID：10.1246/cl.2010.106, ISSN：0366-7022, eISSN：1348-0715, Web of Science ID：WOS:000275524800014

Primary Photochemical Process of Thiobenzophenone as Studied by Laser Flash Photolysis　　　　　　　　　　　　　　　
Tanaka Miyuki; Yago Tomoaki; Wakasa Masanobu
CHEMISTRY LETTERS, 巻：38, 号：11, 開始ページ：1086, 終了ページ：1087, 2009年10月, ［査読有り］, ［最終著者, 責任著者］
DOI：https://doi.org/10.1246/cl.2009.1086
DOI ID：10.1246/cl.2009.1086, ISSN：0366-7022, Web of Science ID：WOS:000272854200037

Ethanol Concentration Dependence of Photoinduced Charge Separation Reaction between Zinc Tetraphenylporphyrin and Duroquinone Studied by Laser Flash Photolysis　　　　　　　　　　　　　　　
Tomoaki Yago; Masao Gohdo; Masanobu Wakasa
CHEMISTRY LETTERS, 巻：38, 号：9, 開始ページ：880, 終了ページ：881, 2009年08月, ［査読有り］, ［最終著者］
Ethanol concentration dependence of photoinduced charge separation between zinc tetraphenylporphyrin (ZnTPP) and duroquinone (DQ) in benzonitrile was studied by nanosecond laser flash photolysis. Acceleration of the photoinduced charge separation reaction rate by hydrogen bonding between DQ anion radical and ethanol was observed. A simple analysis in the framework of the Marcus theory indicated that the observed electron-transfer reaction rate was affected not only by the decrease of the reaction free energy but also an increase of the reorganization energy in the presence of hydrogen bonding.
CHEMICAL SOC JAPAN, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/cl.2009.880
DOI ID：10.1246/cl.2009.880, ISSN：0366-7022, eISSN：1348-0715, Web of Science ID：WOS:000270590500004

Nanoscale Heterogeneous Structure of Ionic Liquid as Revealed by Magnetic Field Effects
Masanobu Wakasa; Tomoaki Yago; Atom Hamasaki
The Journal of Physical Chemistry B, 巻：113, 号：31, 開始ページ：10559, 終了ページ：10561, 2009年07月, ［査読有り］, ［筆頭著者, 責任著者］
American Chemical Society (ACS), 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp905543k
DOI ID：10.1021/jp905543k, ISSN：1520-6106, eISSN：1520-5207

Magnetic Field Effect on a Radical Pair Reaction as a Probe of Microviscosity　　　　　　　　　　　　　　　
Atom Hamasaki; Tomoaki Yago; Masanobu Wakasa
The Journal of Physical Chemistry B, 巻：112, 号：45, 開始ページ：14185, 終了ページ：14192, 2008年10月, ［査読有り］, ［最終著者, 責任著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp804862w
DOI ID：10.1021/jp804862w, ISSN：1520-6106, eISSN：1520-5207, CiNii Articles ID：80019963904, PubMed ID：18939791, Web of Science ID：WOS:000260675800013

Magnetic field effects due to the relaxation mechanism observed for the photo-induced electron transfer reaction of zinc(II) tetraphenylporphyrin and 2-methyl-1,4-naphthoquinone　　　　　　　　　　　　　　　
Masao Gohdo; Yasutaka Kitahama; Yoshio Sakaguchi; Masanobu Wakasa
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 巻：199, 号：2-3, 開始ページ：130, 終了ページ：135, 2008年09月, ［最終著者, 責任著者］
The magnetic field effects (MFEs) on the photo-induced electron transfer (PET) reaction of zinc(II) tetraphenylporphyrin (ZnTPP) with 2-methyl-1,4-naphthoquinone (2MNQ) in a mixed solvent of cyclohexanol and 2-propanol were investigated at 293 K by a nanosecond laser flash photolysis technique. Upon irradiation of ZnTPP, the electron transfer from ZnTPP to 2MNQ occurred and the corresponding cation and anion radicals were generated. The relative yield of the escaped 2MNQ anion radical, R(B), showed appreciable MFEs. The R(B) values increased between 0 and 0.1 T, then decreased again between 0.1 and 1.65T. The observed MFEs can be explained in terms of the relaxation mechanism. (C) 2008 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE SA, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/j.jphotochem.2008.05.006
DOI ID：10.1016/j.jphotochem.2008.05.006, ISSN：1010-6030, CiNii Articles ID：80019818611, Web of Science ID：WOS:000259834000002

Anomalous magnetic field effects on photochemical reactions in ionic liquid under ultrahigh fields of up to 28 T　　　　　　　　　　　　　　　
Atom Hamasaki; Tomoaki Yago; Tadashi Takamasu; Giyuu Kido; Masanobu Wakasa
JOURNAL OF PHYSICAL CHEMISTRY B, 巻：112, 号：11, 開始ページ：3375, 終了ページ：3379, 2008年02月, ［査読有り］, ［最終著者, 責任著者］
The magnetic field effects (MFEs) on photoinduced hydrogen abstraction reactions between benzophenone and thiophenol in an ionic liquid, N,N,N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl) imide (TMPA TFSI), were studied by a nanosecond laser flash photolysis technique under ultrahigh fields of up to 28 T. Extremely large and anomalous stepwise MFEs were observed for the first time. The escape yield of benzophenone ketyl radical decreased with increasing magnetic field strength (B) at 0 T < B <= 2 T. The decrease was almost saturated at 2 T < B <= 10 T. At much higher fields (10 T < B <= 28 T), the yield decreased again with increasing B, producing a 25% decrease at 28 T.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp710047c
DOI ID：10.1021/jp710047c, ISSN：1520-6106, CiNii Articles ID：80019421159, PubMed ID：18298111, Web of Science ID：WOS:000253945900016

Studies of germanium-platinum bonds in bis(aryl-substituted germyl)platinum complexes by laser flash photolysis and chemical trapping experiments　　　　　　　　　　　　　　　
Kunio Mochida; Yusuke Masukawa; Atsuko Yamada; Mai Yanaga; Masato Nanjo; Hidekazu Arii; Masao Gohdo; Masanobu Wakasa
CHEMISTRY LETTERS, 巻：37, 号：1, 開始ページ：62, 終了ページ：+, 2007年12月, ［査読有り］, ［最終著者］
The UV photolysis of bis(triaryl-substituted germyl)platinum complexes, Pt(Ar3Ge)(2)(PMe2Ph)(2) (Ar = Ph, p-C6H4-SiMe3, and p-C6H4C(CH3)(3)) in THF at room temperature results in Ge-Pt bonds homolysis to give the corresponding germyl radicals.
CHEMICAL SOC JAPAN, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/cl.2008.62
DOI ID：10.1246/cl.2008.62, ISSN：0366-7022, eISSN：1348-0715, CiNii Articles ID：10020147828, Web of Science ID：WOS:000252882700029

The magnetic field effects on photochemical reactions in ionic liquids　　　　　　　　　　　　　　　
Masanobu Wakasa
JOURNAL OF PHYSICAL CHEMISTRY B, 巻：111, 号：32, 開始ページ：9434, 終了ページ：9436, 2007年07月, ［査読有り］, ［筆頭著者, 最終著者, 責任著者］
The magnetic field effects (MFEs) on photoinduced hydrogen abstraction reactions of benzophenone (BP) with thiophenol (PhSH) in the ionic liquids (ILs) N,N,N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl) imide (TMPA TFSI), N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl) imide (P13 TFSI), and N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl) imide (PP13 TFSI) were investigated at 296 K by using a nanosecond laser flash photolysis technique under magnetic fields of 0-1.7 T. Large MFEs were observed for the first time in the ILs. In TMPA TFSI, the yield of the benzophenone ketyl radical gradually decreased with increasing magnetic field strength from 0 to 1.7 T, producing a 20% decrease at 1.7 T.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp074331a
DOI ID：10.1021/jp074331a, ISSN：1520-6106, Web of Science ID：WOS:000248658200005

Re-examination of the photochemical reaction of octaisopropylcyclotetragermane　　　　　　　　　　　　　　　
Masanobu Wakasa; Yuya Takamori; Toshiyuki Takayanagi; Masayuki Orihara; Tsuyoshi Kugita
Journal of Organometallic Chemistry, 巻：692, 号：14, 開始ページ：2855, 終了ページ：2860, 2007年03月, ［査読有り］, ［筆頭著者, 責任著者］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/j.jorganchem.2007.03.017
DOI ID：10.1016/j.jorganchem.2007.03.017, ISSN：0022-328X

An Improved Electrochemical Synthesis of Network Polysilanes
Mitsutoshi OKANO; Keita NAKAMURA; Kazuhiro YAMADA; Nobutada HOSODA; Masanobu WAKASA
Electrochemistry, 巻：74, 号：12, 開始ページ：956, 終了ページ：958, 2006年12月, ［査読有り］, ［最終著者］
The Electrochemical Society of Japan, 研究論文（学術雑誌）
DOI：https://doi.org/10.5796/electrochemistry.74.956
DOI ID：10.5796/electrochemistry.74.956, ISSN：1344-3542, eISSN：2186-2451

半導体酸化チタン薄膜による光触媒反応に対する磁場効果　　　　　　　　　　　　　　　
若狭雅信; 小林佑輔; 岡野光俊
2006年08月, ［査読有り］, ［筆頭著者, 最終著者］
DOI：https://doi.org/10.11454/photogrst1964.69.271
DOI ID：10.11454/photogrst1964.69.271

Magnetic field effects on the reaction of a triplet-born radical pair consisting of two equivalent sulphur-centre radicals under ultrahigh fields of up to 28 T
A. Hamasaki; Y. Sakaguchi; K. Nishizawa; G. Kido; M. Wakasa
Molecular Physics, 巻：104, 号：10-11, 開始ページ：1765, 終了ページ：1771, 2006年05月, ［査読有り］, ［最終著者, 責任著者］
Informa UK Limited, 研究論文（学術雑誌）
DOI：https://doi.org/10.1080/00268970600566096
DOI ID：10.1080/00268970600566096, ISSN：0026-8976, eISSN：1362-3028

Anomalous Magnetic Field Effects Interpreted by the Relaxation Mechanism under Ultrahigh Fields of up to 28 T
Atom Hamasaki; Kiyoshi Nishizawa; Yoshio Sakaguchi; Toshiyuki Okada; Giyuu Kido; Masanobu Wakasa
Chemistry Letters, 巻：34, 号：12, 開始ページ：1692, 終了ページ：1693, 2005年11月, ［査読有り］, ［最終著者, 責任著者］
Abstract

Magnetic field effects on the triplet sensitization reaction of p-aminophenyl disulfide were studied in a sodium dodecylsulfate micellar solution by a nanosecond laser flash photolysis technique under ultrahigh magnetic fields of up to 28 T. The yield of the escaped p-aminophenyl thiyl radical decreased by 6 ± 2% at 28 T compared with that at 0 T.
Oxford University Press (OUP), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/cl.2005.1692
DOI ID：10.1246/cl.2005.1692, ISSN：0366-7022, eISSN：1348-0715

Magnetic field effect on photocatalytic decomposition reaction of tert-butanol with platinized TiO2 particles
Masanobu Wakasa; Nobuharu Ishii; Mitsutoshi Okano
Comptes Rendus. Chimie, 巻：9, 号：5-6, 開始ページ：836, 終了ページ：840, 2005年10月, ［査読有り］, ［筆頭著者, 責任著者］
Cellule MathDoc/Centre Mersenne, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/j.crci.2005.02.048
DOI ID：10.1016/j.crci.2005.02.048, eISSN：1878-1543

Magnetic Field Effect on the Photocatalytic Reaction with Ultrafine TiO₂ Particles
Masanobu Wakasa; Sachiko Suda; Hisaharu Hayashi; Nobuharu Ishii; Mitsutoshi Okano
The Journal of Physical Chemistry B, 巻：108, 号：32, 開始ページ：11882, 終了ページ：11885, 2004年07月, ［査読有り］, ［筆頭著者, 責任著者］
American Chemical Society (ACS), 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp037232f
DOI ID：10.1021/jp037232f, ISSN：1520-6106, eISSN：1520-5207

Viscosity Dependence of the Magnetic Field Effect Due to the ΔgMechanism　　　　　　　　　　　　　　　
Yasutaka Kitahama; Masanobu Wakasa; Yoshio Sakaguchi
The Journal of Physical Chemistry A, 巻：108, 号：5, 開始ページ：754, 終了ページ：757, 2004年01月, ［査読有り］, ［最終著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp030779+
DOI ID：10.1021/jp030779+, ISSN：1089-5639, eISSN：1520-5215, Web of Science ID：WOS:000188553000008

A quantitative analysis of recombination data in high magnetic fields
J. BOIDEN PEDERSEN; MARTIN J. HANSEN; ANATOLE A. NEUFELD; MASANOBU WAKASA; HISAHARU HAYASHI
Molecular Physics, 巻：100, 号：9, 開始ページ：1349, 終了ページ：1354, 2002年05月, ［査読有り］
Informa UK Limited, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1080/00268970110112390
DOI ID：10.1080/00268970110112390, ISSN：0026-8976, eISSN：1362-3028

Magnetic field effects on the hydrogen abstraction reaction of triplet 4-methoxybenzophenone with thiophenol as studied by a picosecond laser flash photolysis technique　　　　　　　　　　　　　　　
ISAMU MORINO; MASANOBU WAKASA; HISAHARU HAYASHI
Molecular Physics, 巻：100, 号：9, 開始ページ：1283, 終了ページ：1289, 2002年05月, ［査読有り］, ［責任著者］
Informa UK Limited, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1080/00268970110109745
DOI ID：10.1080/00268970110109745, ISSN：0026-8976, eISSN：1362-3028, Web of Science ID：WOS:000175511300001

Re-examination of the magnetic field effects on the thermal reactions of benzyl and pentafluorobenzyl halides with n-butyllithium in hexane　　　　　　　　　　　　　　　
MASANOBU WAKASA; HISAHARU HAYASHI
Molecular Physics, 巻：100, 号：8, 開始ページ：1099, 終了ページ：1105, 2002年04月, ［査読有り］, ［筆頭著者, 責任著者］
Informa UK Limited, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1080/00268970110109754
DOI ID：10.1080/00268970110109754, ISSN：0026-8976, eISSN：1362-3028, Web of Science ID：WOS:000174955900007

Novel Photocycloaddition of Aromatic Ketones to Cyclic Oligosilanes　　　　　　　　　　　　　　　
KAKO Masahiro; GU Mei; TAKENAKA Yohei; TAKAGI Kentaro; KONDO Kazuhiro; NAKADAIRA Yasuhiro; WAKASA Masanobu; HAYASHI Hisaharu
Chemistry letters, 巻：2001, 号：12, 開始ページ：1220, 終了ページ：1221, 2001年12月, ［査読有り］
英語, 研究論文（学術雑誌）
ISSN：0366-7022, CiNii Articles ID：10007540778, CiNii Books ID：AA00603318

Silylene-transfer reactions of cyclic organosilanes induced by phenanthraquinone triplet　　　　　　　　　　　　　　　
Masahiro Kako; Masumi Ninomiya; Mei Gu; Yasuhiro Nakadaira; Masanobu Wakasa; Hisaharu Hayashi; Takeshi Akasaka; Takatsugu Wakahara
Journal of Organometallic Chemistry, 巻：636, 号：1-2, 開始ページ：63, 終了ページ：68, 2001年11月, ［査読有り］
On irradiation cyclic organosilanes 1a-b, 7 and 8 react with phenanthraquinone (PQ) to afford corresponding dioxasilolenes 2a-b as silylene-transfer products. The quenching experiment by anthracene reveals that PQ should act as triplet (3PQ*) to undergo radical displacement at the silicon atom of 1a-b. In polar solvents, electron-transfer from 1a-b to 3PQ* would generate PQ radical anion and the coupling of the radical ion pair formed would cause the Si-Si bond cleavage followed by intramolecular O-Si bond formation to give silylene transfer product 2a-b. Since the photolysis of PQ with 1a-b in the presence of CCl4 gives dichlorooligosilanes, intermediacy of oligosilanyl radicals is highly probable. The quenching rate constant kq of 3PQ* by cyclic organosilane 1b has been determined by laser flash photolysis. In a mixed solvent of CH3CN and CH2Cl2, 3PQ* is readily quenched by the addition of 1b with the formation of PQ radical anion. On the other hand, since PQ radical anion has not been observed on the laser photolysis, the quenching of 3PQ* with 1b in benzene should be less efficient. © 2001 Elsevier Science B.V.
英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/S0022-328X(01)01070-1
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0347572482&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=0347572482&origin=inward
DOI ID：10.1016/S0022-328X(01)01070-1, ISSN：0022-328X, SCOPUS ID：0347572482

The electron transfer mechanism for the reaction of the tributylstannyl anion with butyl chlorides　　　　　　　　　　　　　　　
T Kugita; H Onoda; M Wakasa
MAIN GROUP METAL CHEMISTRY, 巻：24, 号：9, 開始ページ：613, 終了ページ：616, 2001年09月, ［査読有り］, ［最終著者］
FREUND PUBLISHING HOUSE LTD, 英語, 研究論文（学術雑誌）
ISSN：0334-7575, Web of Science ID：WOS:000171855000007

Time-resolved EPR and ODMR studies on the lowest excited triplet states of alpha-silyl and alpha-germyl ketones　　　　　　　　　　　　　　　
ISM Saiful; M Hanaya; M Iwaizumi; M Wakasa; K Mochida; M Mukai; N Hirota; S Yamauchi
MOLECULAR PHYSICS, 巻：99, 号：14, 開始ページ：1183, 終了ページ：1192, 2001年07月, ［査読有り］
Sublevel properties of the lowest excited triplet (T-1) n pi* states of alpha -silyl and alpha -germyl ketones were examined by means of ODMR, time-resolved EPR and optical spectroscopy. The EPR parameters, D, E and g, population ratios, and triplet lifetimes were obtained. The D value and the triplet lifetime varied among the molecules. In contrast the E value and population ratio remains nearly the same. These properties together with their solvent dependence and emission properties are interpreted in terms of spin-orbit couplings between T-1 (n pi*) and higher S-1 (n pi*), T-2 (pi pi*) and S-2 (pi pi*) states. An origin of the remarkable red-shifts of (1,3)(n pi*) are discussed based on a model of delocalized n, pi and pi* electrons over the Si and Ge atoms. This model is also consistent with all the triplet properties obtained.
TAYLOR & FRANCIS LTD, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1080/00268970110043982
DOI ID：10.1080/00268970110043982, ISSN：0026-8976, Web of Science ID：WOS:000169438700003

Can an external magnetic field affect the thermal reaction of pentafluorobenzyl chloride with n-butyllithium in hexane?　　　　　　　　　　　　　　　
Masanobu Wakasa; Hisaharu Hayashi
Chemical Physics Letters, 巻：340, 号：5-6, 開始ページ：493, 終了ページ：499, 2001年06月, ［筆頭著者］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/s0009-2614(01)00349-9
DOI ID：10.1016/s0009-2614(01)00349-9, ISSN：0009-2614, Web of Science ID：WOS:000169373800016

Magnetic field effects and spin dynamics of radical reactions in solution　　　　　　　　　　　　　　　
H Hayashi; Y Sakaguchi; M Wakasa
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 巻：74, 号：5, 開始ページ：773, 終了ページ：783, 2001年05月, ［査読有り］, ［最終著者］
A pulsed magnet which is useful for the research of chemical reactions has recently been constructed by our group. Here, the world record of the maximum magnetic field (30 T) has been attained in this research area. An optical detected X-band ESR apparatus has also been developed by our group. The world's best sensitivity and resolution have been realized in this apparatus. In this account, we review our recent results on new magnetic field effects and spin dynamics obtained with such novel methods as described above for radical reactions at room temperature in solution. In Section 1, typical mechanisms of MFEs on radical pairs such as the Deltag mechanism and the relaxation mechanism are explained as the introduction of this review. In Section 2, the saturation of MFEs due to the Deltag mechanism observed for radical pairs generated from the photoreduction of 4-methoxybenzophenone with benzenethiol in fluid solutions under ultrahigh fields are described. In Section 3, the saturation and reversion of MFEs due to the relaxation mechanism observed for radical pairs generated from the photoreduction of carbonyl and quinone compounds in micellar solutions under ultrahigh fields are reviewed. In Section 4, the first observation of MFEs on the reactions of three-spin systems generated photochemically in solution are introduced. In Section 5, we describe spin dynamics of radical pairs studied with our optically detected ESR apparatus for radical pairs generated from the photoreduction of carbonyl and quinone compounds in micellar solutions.
CHEMICAL SOC JAPAN, 英語
ISSN：0009-2673, eISSN：1348-0634, Web of Science ID：WOS:000169365200001

Photodissociation of Nitric Oxide from Nitrosyl Metalloporphyrins in Micellar Solutions
Haruna Adachi; Hirotaka Sonoki; Mikio Hoshino; Masanobu Wakasa; Hisaharu Hayashi; Yoshio Miyazaki
The Journal of Physical Chemistry A, 巻：105, 号：2, 開始ページ：392, 終了ページ：398, 2000年12月, ［査読有り］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp002515i
DOI ID：10.1021/jp002515i, ISSN：1089-5639, eISSN：1520-5215

Magnetic field effects on the dynamic behavior of a radical pair as studied by a sub-nanosecond laser flash photolysis technique　　　　　　　　　　　　　　　
Masanobu Wakasa; Hisaharu Hayashi
Chemical Physics Letters, 巻：327, 号：5-6, 開始ページ：343, 終了ページ：350, 2000年09月, ［査読有り］, ［筆頭著者］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/s0009-2614(00)00894-0
DOI ID：10.1016/s0009-2614(00)00894-0, ISSN：0009-2614, CiNii Articles ID：80011903699, Web of Science ID：WOS:000089301900013

Studies of photochemical reactions of 7,8-digermabicyclo[2.2.2]octadienes by steady-state and laser flash photolysis techniques　　　　　　　　　　　　　　　
K Mochida; T Kayamori; M Wakasa; H Hayashi; MP Egorov
ORGANOMETALLICS, 巻：19, 号：17, 開始ページ：3379, 終了ページ：3386, 2000年08月, ［査読有り］
The photochemistry of 1,4-diphenyl-2,3-benzo-7,7,8,8-tetraalkyl-7,8-digermabicyclo[2.2.2]octadienes in solution has been studied in detail by steady-state, nanosecond laser flash photolysis, and matrix isolation techniques. Photolysis of 7,8-digermabicyclo[2.2.2]octadienes in solution resulted mainly in the formation of tetraalkyldigermenes and 1,4-diphenylnaphthalene in the triplet excited state. The 7,8-digermabicyclo[2.2.2]octadiene also photochemically isomerized to 1,4-diphenyl-2,3-benzo-6,6,7,7-tetraalky-6,7-digermatricyclo[3.3.0.0]octane as minor product. The reactions of tetraalkyldigermenes with butadienes (2,3-dimethylbuta-1,3-diene and 2-methylbuta-1,3-diene), carbon tetrachloride, and methanol gave the corresponding digermene trapped products: 1,2-digennacyclohex-4-enes, 1,2-dichlorodigermanes together with hexachloroethane, and methoxydigermanes, respectively, in good yields. The transient bands of tetraalkyldigermenes using nanosecond laser flash photolysis appeared at ca. 380 nm. The rate constants for the quenching reactions of the digermene with oxygen, polyhalomethanes, alcohols, 2,3-dimethylbuta-1,3-diene, 1-hexyne, and triethylsilane were also measured under various conditions. The quenching reactions of digermenes with carbon tetrachloride and ethanol (k = similar to 10(7) M-1 s(-1)) are 100 times faster than that with 1,3-butadiene (h = similar to 10(5): M-1 s(-1)). The digermenes were very rapidly quenched with oxygen (h = similar to 10(8) M-1 s(-1)), but very slowly with 1-hexyne and triethylsilane (k < 10(4) M-1 s(-1)) under reaction conditions. The UV absorption bands of tetraalkyldigermenes generated from 7,8-digermabicyclo[2.2.2]octadienes in matrix at 77 K were also observed at 370-380 nm. The mechanism of digermene formation was also discussed.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/om000471u
DOI ID：10.1021/om000471u, ISSN：0276-7333, Web of Science ID：WOS:000088956200019

Magnetic Field Effects Due to the ΔgMechanism upon Chemical Reactions through Radical Pairs under Ultrahigh Fields of up to 30 T　　　　　　　　　　　　　　　
Masanobu Wakasa; Kiyoshi Nishizawa; Haruo Abe; Giyuu Kido; Hisaharu Hayashi
Journal of the American Chemical Society, 巻：121, 号：39, 開始ページ：9191, 終了ページ：9197, 1999年09月, ［査読有り］, ［筆頭著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/ja9912776
DOI ID：10.1021/ja9912776, ISSN：0002-7863, eISSN：1520-5126, CiNii Articles ID：80011394122, Web of Science ID：WOS:000083009700025

光化学反応に対する磁場効果と磁気同位体効果　　　　　　　　　　　　　　　
若狭雅信
放射線化学, 巻：68, 開始ページ：3, 終了ページ：11, 1999年09月, ［査読有り］, ［招待有り］, ［筆頭著者, 責任著者］
日本語, 研究論文（学術雑誌）

Mechanism of the Reaction of Tri-n-butylstannyl Anion with n-Butyl Bromide and Iodide As Studied by the ¹¹⁹Sn CIDNP Technique　　　　　　　　　　　　　　　
Masanobu Wakasa; Tsuyoshi Kugita
Organometallics, 巻：18, 号：16, 開始ページ：2941, 終了ページ：2943, 1999年07月, ［査読有り］, ［筆頭著者, 責任著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/om990094p
DOI ID：10.1021/om990094p, ISSN：0276-7333, eISSN：1520-6041, CiNii Articles ID：80011262185, Web of Science ID：WOS:000081997400006

Reactions of organogermylenes generated by photolysis of 7-germanorbornadienes and cyclohexagermanes with organic halides and trimethyltin chloride　　　　　　　　　　　　　　　
M Adachi; K Mochida; M Wakasa; H Hayashi
MAIN GROUP METAL CHEMISTRY, 巻：22, 号：4, 開始ページ：227, 終了ページ：230, 1999年04月, ［査読有り］
Reactions of organogermylenes, R2Ge: (R=Me and Pr-1), generated by photolysis of 7-germanorbornadienes and cyclohexagermanes with organic halides (R'X) were examined by chemical trapping experiments and CIDNP measurements. The organogermylenes reacted quantitatively with polyhalomethanes (XCCl3, X=Cl, Br) and benzyl bromide to give the corresponding abstraction products together with polyhaloethanes and bibenzyl, respectively. With trimethyltin chloride the organogermylenes afforded effectively the insertion products.
FREUND PUBLISHING HOUSE LTD, 英語, 研究論文（学術雑誌）
ISSN：0334-7575, Web of Science ID：WOS:000079944400004

Photoinduced electron-transfer reaction of 7,8-disilabicyclo[2.2.2]octa-2,5-dienes　　　　　　　　　　　　　　　
Masahiro Kako; Kaname Hatakenaka; Kakuma Seiji; Masumi Ninomiya; Yasuhiro Nakadaira; Masanori Yasui; Fujiko Iwasaki; Masanobu Wakasa; Hisaharu Hayashi
Tetrahedron Letters, 巻：40, 号：6, 開始ページ：1133, 終了ページ：1136, 1999年02月, ［査読有り］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/s0040-4039(98)02546-5
DOI ID：10.1016/s0040-4039(98)02546-5, ISSN：0040-4039

Temperature Effect on the Kinetics for the Reaction of Stannyl Anion with Primary Butyl Bromide　　　　　　　　　　　　　　　
Tsuyoshi Kugita; Masanobu Wakasa
Phosphorus, Sulfur, and Silicon and the Related Elements, 巻：150, 号：1, 開始ページ：271, 終了ページ：276, 1999年02月, ［査読有り］, ［最終著者］
Informa UK Limited, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1080/10426509908546393
DOI ID：10.1080/10426509908546393, ISSN：1042-6507, eISSN：1563-5325, Web of Science ID：WOS:000083740000026

Laser flash photolysis of phenyl-substituted cyclic oligogermanes　　　　　　　　　　　　　　　
K Mochida; M Adachi; M Wakasa; H Hayash
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS, 巻：151, 開始ページ：237, 終了ページ：243, 1999年, ［査読有り］
Photochemical reactions of phenyl-substituted cyclic oligogermanes, (Ph2Ge)(n) (n=4-6), were investigated by laser flash photolysis and chemical trapping experiments.
GORDON BREACH SCI PUBL LTD, 英語, 研究論文（学術雑誌）
ISSN：1042-6507, Web of Science ID：WOS:000083740000022

Synthesis and photochemical reactions of polystannanes
Kunio Mochida; Masamichi Hayakawa; Takuya Tsuchikawa; Yasuo Yokoyama; Masanobu Wakasa; Hisaharu Hayashi
Chemistry Letters, 開始ページ：91, 終了ページ：92, 1998年12月, ［査読有り］
Several polystannanes were synthesized by the reaction of dichlorostannanes with samarium (II) diiodide and alkali earth metal (Mg, Ca) vapor-solvent cocondensates. Laser flash photolysis of the polystannane involved Sn-Sn bond homolysis to yield mainly polystannyl radicals.
DOI：https://doi.org/10.1246/cl.1998.91
DOI ID：10.1246/cl.1998.91, ISSN：0366-7022, SCOPUS ID：0032382523

Kinetic studies of reactions of the stannyl anion with primary alkyl halides by a stopped-flow technique　　　　　　　　　　　　　　　
T Kugita; M Wakasa; J Tamura; H Hayashi
INORGANIC CHEMISTRY COMMUNICATIONS, 巻：1, 号：10, 開始ページ：386, 終了ページ：388, 1998年10月, ［査読有り］
The decay of thr tributylstannyl anion in the presence of primary butyl halides was measured directly with a modified stopped-how apparatus for the first time. The resulting rate constants of the stannyl anion were much larger than those calculated as an electron transfer reaction by the Hush-Marcus theory. It is suggested that the stannyl anion reacts with primary halides as a nucleophile rather than as an electron-donor. (C) 1998 Elsevier Science S.A. All rights reserved.
ELSEVIER SCIENCE BV, 英語, 研究論文（学術雑誌）
ISSN：1387-7003, Web of Science ID：WOS:000077404600007

Saturation of Magnetic Field Effects Due to the ΔgMechanism under Ultrahigh Fields of up to 28 T
Masanobu Wakasa; Kiyoshi Nishizawa; Haruo Abe; Giyuu Kido; Hisaharu Hayashi
Journal of the American Chemical Society, 巻：120, 号：40, 開始ページ：10565, 終了ページ：10566, 1998年09月, ［査読有り］, ［筆頭著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/ja980503t
DOI ID：10.1021/ja980503t, ISSN：0002-7863, eISSN：1520-5126

Direct Observation of a Stannyl Radical in the Reactions of the Tributylstannyl Anion with Alkyl Halides by a Stopped-Flow Technique　　　　　　　　　　　　　　　
Masanobu Wakasa; Tsuyoshi Kugita
Organometallics, 巻：17, 号：10, 開始ページ：1913, 終了ページ：1915, 1998年04月, ［筆頭著者, 責任著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/om980022i
DOI ID：10.1021/om980022i, ISSN：0276-7333, eISSN：1520-6041, Web of Science ID：WOS:000073789900003

Enrichment of Germanium-73 with the Magnetic Isotope Effect on the Hydrogen Abstraction Reaction of Triplet Benzophenone with Triethylgermane in an SDS Micellar Solution　　　　　　　　　　　　　　　
Masanobu Wakasa; Hisaharu Hayashi; Katuyoshi Ohara; Takeo Takada
Journal of the American Chemical Society, 巻：120, 号：13, 開始ページ：3227, 終了ページ：3230, 1998年03月, ［査読有り］, ［筆頭著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/ja9739493
DOI ID：10.1021/ja9739493, ISSN：0002-7863, eISSN：1520-5126, CiNii Articles ID：80010230264, Web of Science ID：WOS:000073072700027

Synthesis, photochemical and conducting properties of oligo(digermanylene-phenylene)s and related compounds　　　　　　　　　　　　　　　
K Mochida; S Maeyama; M Wakasa; H Hayashi
POLYHEDRON, 巻：17, 号：22, 開始ページ：3963, 終了ページ：3967, 1998年, ［査読有り］
Oligo(digermanylene-phenylene)s and related oligomers were prepared by treatment of di-Grignard reagents of the corresponding aryl dibromides with 1,2-dichlorotetramethyldigermane. Upon ultraviolet irradiation of films of oligo(digermanylene-phenylene) and related oligomer in air, the germanium-germanium bond in the oligomer films changed into a digermoxane chain probed by XPS. The laser flash photolysis of the oligo(digermanylene-phenylene) film showed the formation of an oligogermyl radical as a reactive intermediate during photodegradation. Iodine doping of the oligomers showed the conductivities of the order of 10(-4) S cm(-1) (C) 1998 Elsevier Science Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, 英語, 研究論文（学術雑誌）
ISSN：0277-5387, Web of Science ID：WOS:000077509300017

Photodegradation of thin films of polygermanes　　　　　　　　　　　　　　　
Kunio Mochida; Shu-saku Nagano; Hiroki Kawata; Masanobu Wakasa; Hisaharu Hayashi
Journal of Organometallic Chemistry, 巻：542, 号：1, 開始ページ：75, 終了ページ：79, 1997年09月, ［査読有り］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/s0022-328x(97)00287-8
DOI ID：10.1016/s0022-328x(97)00287-8, ISSN：0022-328X, Web of Science ID：WOS:A1997YB36200009

Micropattern of GeO2/GeC Lines Prepared by UV Irradiation and Heat Treatment of Polygermane Copolymers of Methylphenylgermylene/Phenylgermyne Units　　　　　　　　　　　　　　　
Kunio Mochida; Shuh-Saku Nagano; Hiroki Kawata; Masanobu Wakasa; Hisaharu Hayashi
Applied Organometallic Chemistry, 巻：11, 号：12, 開始ページ：949, 終了ページ：955, 1997年05月, ［査読有り］
Upon ultraviolet irradiation of polygermane copolymers of methylphenylgermylene/phenylgermyne units (PhMeGe)n(PhGe)m in air, the germanium-germanium bond in the copolymer film changed into a digermoxane chain. Laser flash photolysis of the copolymer film showed the intermediacy of polygermyl radicals generated by Ge-Ge bond homolysis. The XPS showed the formation of germanium carbide (GeC) and germanium dioxide (GeO2) upon heating the unirradiated and irradiated copolymer (PhMeGe)n(PhGe)m, films, respectively. A relatively high-resolution micropattern of GeC/GeO2 was obtained by combining the photochemical and thermal properties of the copolymers of methylphenylgermylene/phenylgermyne units. © 1997 John Wiley &
Sons, Ltd.
John Wiley and Sons Ltd, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1002/(sici)1099-0739(199712)11:12<949::aid-aoc653>3.0.co;2-%23
DOI ID：10.1002/(sici)1099-0739(199712)11:12<949::aid-aoc653>3.0.co;2-%23, ISSN：0268-2605, SCOPUS ID：2542567259

Magnetic Field Effects on the Hydrogen Abstraction Reactions of Triplet Benzophenone with Thiophenol in Nonviscous Homogeneous Solutions　　　　　　　　　　　　　　　
Masanobu Wakasa; Hisaharu Hayashi
The Journal of Physical Chemistry, 巻：100, 号：39, 開始ページ：15640, 終了ページ：15643, 1996年01月, ［査読有り］, ［筆頭著者］
American Chemical Society (ACS), ベンガル語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/jp961599l
DOI ID：10.1021/jp961599l, ISSN：0022-3654, eISSN：1541-5740, Web of Science ID：WOS:A1996VK04600004

Anomalous Magnetic Field Effects Observed in the Reaction of a Triplet Biradical Involving an O-Centered Radical　　　　　　　　　　　　　　　
Masanobu Wakasa; Hisaharu Hayashi
The Journal of Physical Chemistry, 巻：99, 号：47, 開始ページ：17074, 終了ページ：17077, 1995年11月, ［査読有り］, ［筆頭著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/j100047a004
DOI ID：10.1021/j100047a004, ISSN：0022-3654, eISSN：1541-5740, CiNii Articles ID：80008686803, Web of Science ID：WOS:A1995TF81100004

Reversion of Magnetic Field Effects Observed in the Reaction of a Triplet-Born Radical Pair Consisting of Two Equivalent Sulfur-Centered Radicals　　　　　　　　　　　　　　　
Masanobu Wakasa; Hisaharu Hayashi; Yayoi Mikami; Takeo Takada
The Journal of Physical Chemistry, 巻：99, 号：35, 開始ページ：13181, 終了ページ：13186, 1995年08月, ［査読有り］, ［筆頭著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/j100035a022
DOI ID：10.1021/j100035a022, ISSN：0022-3654, eISSN：1541-5740, Web of Science ID：WOS:A1995RR84600022

Magnetic Field and Magnetic Isotope Effects upon Reactions of Heavy Atom‐Centered Radicals　　　　　　　　　　　　　　　
Hisaharu Hayashi; Masanobu Wakasa; Yoshio Sakaguchi
Journal of the Chinese Chemical Society, 巻：42, 号：2, 開始ページ：343, 終了ページ：352, 1995年04月, ［査読有り］
Abstract

We present our recent studies on magnetic field effects (MFEs) observed in reactions of heavy atom‐centered radicals such as Si‐,P‐, Ge‐, and Sn‐radicals with a ns‐laser photolysis technique under magnetic fields of 0–10 T. Although the MFES of heavy atom‐centered radicals are much smaller than those of C‐radicals due to the spin‐orbit interaction of heavy atoms, we have found appreciable MFEs in many reactions of such heavy atom‐centered radicals. Comparing the MFES of C‐radicals with those of heavy atom‐centered ones, we have explained the MFEs of heavy atom‐centered radicals in terms of the Δg and relaxation mechanisms. We have found that the separation between the MFES due to the Δg mechanism and those due to the relaxation one is possible with the enhancement of spin relaxation by the addition of a paramagnetic ion.

We have also tried to enrich magnetic isotopes of heavy atoms with the magnetic isotope effect (MIE), using the reactions which show fairly large MFES. Recently, we have succeeded in enriching ⁷³Ge. This is the heaviest isotope which has so far been enriched with the MIE from samples of natural abundance.
Wiley, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1002/jccs.199500046
DOI ID：10.1002/jccs.199500046, ISSN：0009-4536, eISSN：2192-6549, Web of Science ID：WOS:A1995QW39200029

Separation of magnetic field effects on the photoreduction of xanthone withp-aminothiophenol into the effects due to the Δgand relaxation mechanisms　　　　　　　　　　　　　　　
Masanobu Wakasa; Yoshio Sakaguchi; Hisaharu Hayashi
Molecular Physics, 巻：83, 号：4, 開始ページ：613, 終了ページ：618, 1994年11月, ［査読有り］, ［筆頭著者］
Informa UK Limited, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1080/00268979400101481
DOI ID：10.1080/00268979400101481, ISSN：0026-8976, eISSN：1362-3028, Web of Science ID：WOS:A1994PW65000001

Paramagnetic Quenching of the Inverted Magnetic Field Effects Observed in the Photoreduction of Decafluorobenzophenone in a Brij35 Micellar Solution　　　　　　　　　　　　　　　
Masanobu Wakasa; Masatoshi Igarashi; Yoshio Sakaguchi; Hisaharu Hayashi
Chemistry Letters, 巻：23, 号：10, 開始ページ：1941, 終了ページ：1944, 1994年10月, ［査読有り］, ［筆頭著者］
Abstract

The inversion of magnetic field effects (MFEs) observed in the photoreduction of decafluorobenzophenone was studied in the absence and presence of a paramagnetic Gd3+ ion. The MFEs appearing at both low (B ≤ 2T) and high (2T < B ≤ 10T) fields were simultaneously quenched by the addition of Gd3+. For the present reaction, it is concluded that the inversion of the MFEs is due to the relaxation mechanism.
Oxford University Press (OUP), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/cl.1994.1941
DOI ID：10.1246/cl.1994.1941, ISSN：0366-7022, eISSN：1348-0715, CiNii Articles ID：10006894740, CiNii Books ID：AA00603318

Magnetic field effect on the dynamic behavior of a radical pair involving an Sn-centered radical　　　　　　　　　　　　　　　
Masanobu Wakasa; Hisaharu Hayashi
Chemical Physics Letters, 巻：229, 号：1-2, 開始ページ：122, 終了ページ：126, 1994年10月, ［査読有り］, ［筆頭著者］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/0009-2614(94)01014-5
DOI ID：10.1016/0009-2614(94)01014-5, ISSN：0009-2614, Web of Science ID：WOS:A1994PN34100021

Photochemical reactions of germoxanes: Generation of germyl and germoxy radicals　　　　　　　　　　　　　　　
Kunio Mochida; Saori Mori; Chie Yoshizawa; Satoshi Tokura; Masanobu Wakasa; Hisaharu Hayashi
Journal of Organometallic Chemistry, 巻：471, 号：1-2, 開始ページ：47, 終了ページ：52, 1994年05月, ［査読有り］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/0022-328x(94)88105-7
DOI ID：10.1016/0022-328x(94)88105-7, ISSN：0022-328X, Web of Science ID：WOS:A1994NN48700008

Magnetic Field Effects Observed upon Photolysis of Para-Substituted Diphenyl Disulfides in Micellar Solutions
Gunnar Jeschke; Masanobu Wakasa; Yoshio Sakaguchi; Hisaharu Hayashi
The Journal of Physical Chemistry, 巻：98, 号：15, 開始ページ：4069, 終了ページ：4075, 1994年04月, ［査読有り］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/j100066a027
DOI ID：10.1021/j100066a027, ISSN：0022-3654, eISSN：1541-5740

Laser flash photolysis of polygermanes. Generation of germylenes and polygermyl radicals　　　　　　　　　　　　　　　
Kunio Mochida; Kohichi Kimijima; Hiromi Chiba; Masanobu Wakasa; Hisaharu Hayashi
Organometallics, 巻：13, 号：2, 開始ページ：404, 終了ページ：406, 1994年02月, ［査読有り］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/om00014a002
DOI ID：10.1021/om00014a002, ISSN：0276-7333, eISSN：1520-6041, Web of Science ID：WOS:A1994MX33800002

Photochemical reactions of 2-(pentamethyldisilanyl)furan and 2-(pentamethyldigermanyl)furan. Formation of a radical pair　　　　　　　　　　　　　　　
Kunio Mochida; Kohichi Kimijima; Masanobu Wakasa; Hisaharu Hayashi
Journal of Organometallic Chemistry, 巻：465, 号：1-2, 開始ページ：101, 終了ページ：107, 1994年02月, ［査読有り］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/0022-328x(94)87043-8
DOI ID：10.1016/0022-328x(94)87043-8, ISSN：0022-328X, Web of Science ID：WOS:A1994MV56500008

ヘキサメチルジゲルマン・キノン間の光誘起電子移動反応
若狭雅信; 五十嵐正敏; 坂口喜生; 林久治
NIPPON KAGAKU KAISHI, 号：3, 開始ページ：267, 終了ページ：269, 1994年, ［査読有り］, ［招待有り］, ［筆頭著者］
The Chemical Society of Japan, 日本語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/nikkashi.1994.267
DOI ID：10.1246/nikkashi.1994.267, ISSN：0369-4577, eISSN：2185-0925

Magnetic Field Effects on Hydrogen Abstraction of Triplet Benzophenone with Thiophenol in an SDS Micellar Solution　　　　　　　　　　　　　　　
Masanobu Wakasa; Yoshio Sakaguchi; Hisaharu Hayashi
Chemistry Letters, 巻：23, 号：1, 開始ページ：49, 終了ページ：50, 1994年01月, ［査読有り］, ［筆頭著者］
Abstract

The photoreduction of benzophenone with thiophenol was studied by a laser flash photolysis under the magnetic fields of 0–10 T. The escape yields of the benzophenone ketyl and phenylthiyl radicals decreased with increasing magnetic field strength. The observed magnetic field effect can be interpreted by the Δg mechanism in the case of a triplet radical pair.
Oxford University Press (OUP), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/cl.1994.49
DOI ID：10.1246/cl.1994.49, ISSN：0366-7022, eISSN：1348-0715, Web of Science ID：WOS:A1994MV93200014

Magnetic field effects on hydrogen abstraction of triplet xanthone with p-aminothiophenol in an SDS micellar solution　　　　　　　　　　　　　　　
Masanobu Wasaka; Yosuke Nakamura; Yoshio Sakaguchi; Hisaharu Hayashi
Chemical Physics Letters, 巻：215, 号：6, 開始ページ：631, 終了ページ：635, 1993年12月, ［査読有り］, ［筆頭著者］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/0009-2614(93)89369-s
DOI ID：10.1016/0009-2614(93)89369-s, ISSN：0009-2614

Enrichment of germanium-73 with the magnetic isotope effect　　　　　　　　　　　　　　　
Masanobu Wakasa; Hisaharu Hayashi; Tomoaki Kobayashi; Takeo Takada
The Journal of Physical Chemistry, 巻：97, 号：51, 開始ページ：13444, 終了ページ：13446, 1993年12月, ［査読有り］, ［筆頭著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/j100153a006
DOI ID：10.1021/j100153a006, ISSN：0022-3654, eISSN：1541-5740, CiNii Articles ID：80007418768, Web of Science ID：WOS:A1993MP90500006

Magnetic field effect on the photodecomposition of p-aminophenyl disulfide in a micellar solution
Masanobu Wakasa; Yoshio Sakaguchi; Hisaharu Hayashi
The Journal of Physical Chemistry, 巻：97, 号：9, 開始ページ：1733, 終了ページ：1735, 1993年03月, ［査読有り］, ［筆頭著者］
American Chemical Society (ACS), 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/j100111a003
DOI ID：10.1021/j100111a003, ISSN：0022-3654, eISSN：1541-5740, SCOPUS ID：0011888422

Magnetic field effects on the photoinduced electron-transfer reactions between hexamethyldisilane and aromatic nitriles in Brij 35 micellar solutions
Masanobu Wakasa; Yoshio Sakaguchi; Junko Nakamura; Hisaharu Hayashi
The Journal of Physical Chemistry, 巻：96, 号：24, 開始ページ：9651, 終了ページ：9656, 1992年11月, ［査読有り］, ［筆頭著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/j100203a017
DOI ID：10.1021/j100203a017, ISSN：0022-3654, eISSN：1541-5740

The first direct observation of magnetic field effects on the dynamic behavior of radical pairs involving Group 14 silicon and germanium centered radicals　　　　　　　　　　　　　　　
Masanobu Wakasa; Yoshio Sakaguchi; Hisaharu Hayashi
Journal of the American Chemical Society, 巻：114, 号：21, 開始ページ：8171, 終了ページ：8176, 1992年10月, ［査読有り］, ［筆頭著者］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/ja00047a028
DOI ID：10.1021/ja00047a028, ISSN：0002-7863, eISSN：1520-5126, CiNii Articles ID：80006728632, Web of Science ID：WOS:A1992JR86300028

Photo-induced electron transfer reaction between hexamethyldisilane and quinones as studied by a CIDNP technique　　　　　　　　　　　　　　　
Masatoshi Igarashi; Toyotoshi Ueda; Masanobu Wakasa; Yoshio Sakaguchi
Journal of Organometallic Chemistry, 巻：421, 号：1, 開始ページ：9, 終了ページ：19, 1991年12月, ［査読有り］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/0022-328x(91)86427-r
DOI ID：10.1016/0022-328x(91)86427-r, ISSN：0022-328X

Photochemistry of phenyl-substituted digermanoxane. First direct observation of germoxy radicals probed by laser flash photolysis　　　　　　　　　　　　　　　
Kunio Mochida; Chie Yoshizawa; Satoshi Tokura; Masanobu Wakasa; Hisaharu Hayashi
Polyhedron, 巻：10, 号：19, 開始ページ：2347, 終了ページ：2349, 1991年12月, ［査読有り］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/s0277-5387(00)86160-4
DOI ID：10.1016/s0277-5387(00)86160-4, ISSN：0277-5387, Web of Science ID：WOS:A1991GQ39600016

Reactivity, absorption and emission of dimethylgermylene photo-generated from dodecamethylcyclohexagermane　　　　　　　　　　　　　　　
Kunio Mochida; Naoko Kanno; Ryuji Kato; Masahiro Kotani; Seigo Yamauchi; Masanobu Wakasa; Hisaharu Hayashi
Journal of Organometallic Chemistry, 巻：415, 号：2, 開始ページ：191, 終了ページ：201, 1991年09月, ［査読有り］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/0022-328x(91)80119-5
DOI ID：10.1016/0022-328x(91)80119-5, ISSN：0022-328X

Photochemical Reactions of Aryl-Substituted Digermanes through a Pair of Organogermyl Radicals　　　　　　　　　　　　　　　
Kunio Mochida; Masanobu Wakasa; Yoshio Sakaguchi; Hisaharu Hayashi
Bulletin of the Chemical Society of Japan, 巻：64, 号：6, 開始ページ：1889, 終了ページ：1895, 1991年06月
Abstract

The photochemical reactions of aryl-substituted digermanes were investigated by trapping experiments and a laser flash photolysis technique. The photolysis of phenylated digermanes resulted in germanium–germanium bond homolysis to give a pair of two germyl radicals. The germyl radicals abstracted a chlorine atom from carbon tetrachloride to give chlorogermanes. The pair of germyl radicals also underwent ipso-substitution, which was a precursor of the germylenes. The mechanism for the photochemistry of phenylated digermanes is discussed.
Oxford University Press (OUP), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/bcsj.64.1889
DOI ID：10.1246/bcsj.64.1889, ISSN：0009-2673, eISSN：1348-0634, Web of Science ID：WOS:A1991FT20500027

FLUORESCENCE OF SILYL AND GERMYL KETONES AND THEIR PRIMARY PHOTOCHEMICAL PROCESSES　　　　　　　　　　　　　　　
M WAKASA; K MOCHIDA; Y SAKAGUCHI; J NAKAMURA; H HAYASHI
JOURNAL OF PHYSICAL CHEMISTRY, 巻：95, 号：6, 開始ページ：2241, 終了ページ：2246, 1991年03月, ［査読有り］, ［筆頭著者］
Dual fluorescence was observed for several mono- and bis-silyl and -germyl ketones in solution at room temperature. From their fluorescence spectra, excitation spectra, quantum yields, and time profiles, the observed fluorescence was assigned to the S2 (the second lowest excited singlet state) --> S0 (the ground state) one and the S1 (the lowest excited singlet state) --> S0 one. For the employed mono-M ketones (Ph(n)Me3-nMCOPh, M = Si or Ge), their S2 lifetimes in cyclohexane were shorter than 160 ps and their S1 ones lay between 0.8 and 2.5 ns. For bis(triphenylsilyl) ketone in cyclohexane, its S2 lifetime was 160 ps and its S1 one as long as 460 ns. Norrish type I cleavage of these ketones in solution was also studied with time-resolved optical absorption and ESR techniques.
AMER CHEMICAL SOC, 英語, 研究論文（学術雑誌）
ISSN：0022-3654, Web of Science ID：WOS:A1991FD11200027

Magnetic field effects on the dynamic behavior of a radical pair involving a germyl radical　　　　　　　　　　　　　　　
Masanobu Wakasa; Yoshio Sakaguchi; Hisaharu Hayashi
Chemical Physics Letters, 巻：176, 号：6, 開始ページ：541, 終了ページ：545, 1991年02月, ［査読有り］, ［筆頭著者］
Photochemical primary process and magnetic field effect of methyltriphenyl germane in a micelle have been investigated with the aid of a nanosecond laser-flash-photolysis technique. The germyl radical generated through triplet state was directly observed. The lifetime of the generated radical pair and the yield of the escaping germyl radical were increased with increasing magnetic field strength from 0 to 1.35 T. The yield at 1.35 T became 1.16 ± 0.02 times that at 0 T. © 1991.
英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/0009-2614(91)90252-5
DOI ID：10.1016/0009-2614(91)90252-5, ISSN：0009-2614, SCOPUS ID：44949279481

Photochemistry of aryl-substituted trigermanes. Generation and mechanism of formation of germylenes　　　　　　　　　　　　　　　
Kunio Mochida; Isao Yoneda; Masanobu Wakasa
Journal of Organometallic Chemistry, 巻：399, 号：1-2, 開始ページ：53, 終了ページ：62, 1990年12月, ［査読有り］, ［最終著者］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/0022-328x(90)80083-c
DOI ID：10.1016/0022-328x(90)80083-c, ISSN：0022-328X, Web of Science ID：WOS:A1990EN04700005

トリフェニル置換４Ｂ族元素（ケイ素，ゲルマニウム，スズ）中心遊離基の低温マトリックス中でのＵＶおよびＥＳＲ研究　　　　　　　　　　　　　　　
若狭雅信; 堀内恭子; 持田邦夫
NIPPON KAGAKU KAISHI, 号：8, 開始ページ：1469, 終了ページ：1471, 1989年08月, ［査読有り］, ［招待有り］, ［筆頭著者］
The Chemical Society of Japan, 日本語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/nikkashi.1989.1469
DOI ID：10.1246/nikkashi.1989.1469, ISSN：0369-4577, eISSN：2185-0925, Web of Science ID：WOS:A1989AM53900047

Photochemistry of aryl-substituted trigermanes　　　　　　　　　　　　　　　
Masanobu Wakasa; Isao Yoneda; Kunio Mochida
Journal of Organometallic Chemistry, 巻：366, 号：1-2, 開始ページ：C1, 終了ページ：C5, 1989年04月, ［査読有り］, ［筆頭著者］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/0022-328x(89)87334-6
DOI ID：10.1016/0022-328x(89)87334-6, ISSN：0022-328X, Web of Science ID：WOS:A1989U388000025

Laser photolysis of aryl-substituted digermanes. Generation of germyl radicals and germylenes　　　　　　　　　　　　　　　
Kunio Mochida; Masanobu Wakasa; Yasuhiro Nakadaira; Yoshio Sakaguchi; Hisaharu Hayashi
Organometallics, 巻：7, 号：8, 開始ページ：1869, 終了ページ：1871, 1988年08月, ［査読有り］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/om00098a029
DOI ID：10.1021/om00098a029, ISSN：0276-7333, eISSN：1520-6041, Web of Science ID：WOS:A1988P775000029

Laser-photolysis study of primary photophysical and photochemical processes of bis(triphenylsilyl)ketone　　　　　　　　　　　　　　　
Masanobu Wakasa; Naoko Inoue; Kunio Mochida; Yoshio Sakaguchi; Hisaharu Hayashi
Chemical Physics Letters, 巻：143, 号：3, 開始ページ：230, 終了ページ：234, 1988年01月, ［査読有り］, ［筆頭著者］
Elsevier BV, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1016/0009-2614(88)87372-x
DOI ID：10.1016/0009-2614(88)87372-x, ISSN：0009-2614, Web of Science ID：WOS:A1988L800400005

Laser photolysis and CIDEP studies of the formation of phenyl-substituted Group IVA element (silicon, germanium, and tin)-centered radicals in direct photoejection of the Group IVA element-centered anions　　　　　　　　　　　　　　　
Kunio Mochida; Masanobu Wakasa; Yoshio Sakaguchi; Hisaharu Hayashi
Journal of the American Chemical Society, 巻：109, 号：26, 開始ページ：7942, 終了ページ：7947, 1987年12月, ［査読有り］
American Chemical Society (ACS), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1021/ja00260a002
DOI ID：10.1021/ja00260a002, ISSN：0002-7863, eISSN：1520-5126, Web of Science ID：WOS:A1987L587100002

４Ｂ族元素（ゲルマニウム，スズ）‐炭素結合を有する化合物のレーザー光分解反応　　　　　　　　　　　　　　　
持田邦夫; 若狭雅信; 坂口喜生; 林久治
NIPPON KAGAKU KAISHI, 号：7, 開始ページ：1171, 終了ページ：1176, 1987年07月, ［査読有り］, ［招待有り］
The Chemical Society of Japan, 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/nikkashi.1987.1171
DOI ID：10.1246/nikkashi.1987.1171, ISSN：0369-4577, eISSN：2185-0925, Web of Science ID：WOS:A1987J152500009

Direct Observation of Stannyl Radicals by Laser-Photolysis of Carbon–Tin and Tin–Tin Bonds　　　　　　　　　　　　　　　
Kunio Mochida; Masanobu Wakasa; Yoshio Sakaguchi; Hisaharu Hayashi
Chemistry Letters, 巻：15, 号：10, 開始ページ：1793, 終了ページ：1796, 1986年10月, ［査読有り］
Abstract

Photochemical primary processes of carbon–tin and tin–tin bonds were studied at room temperature. The stannyl radicals generated were observed directly by laser-photolysis.
Oxford University Press (OUP), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/cl.1986.1793
DOI ID：10.1246/cl.1986.1793, ISSN：0366-7022, eISSN：1348-0715, Web of Science ID：WOS:A1986E422200042

LASER-PHOTOLYSIS STUDY OF ARYL-SUBSTITUTED SILYL AND STANNYL ANIONS　　　　　　　　　　　　　　　
Kunio Mochida; Masanobu Wakasa; Yoshio Sakaguchi; Hisaharu Hayashi
Chemistry Letters, 巻：15, 号：5, 開始ページ：773, 終了ページ：776, 1986年05月, ［査読有り］
Abstract

Photochemical primary processes of aryl-substituted silyl and stannyl anions were studied at room temperature. The silyl and stannyl radicals generated were observed directly by laser-photolysis.
Oxford University Press (OUP), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/cl.1986.773
DOI ID：10.1246/cl.1986.773, ISSN：0366-7022, eISSN：1348-0715, Web of Science ID：WOS:A1986C525400036

CIDEP STUDY OF THE FORMATION OF ARYL-SUBSTITUTED GERMYL RADICALS IN DIRECT PHOTOEJECTION OF THE GERMYL ANIONS　　　　　　　　　　　　　　　
Kunio Mochida; Masanobu Wakasa; Hisao Murai; Yasumasa J I’haya; Yoshio Sakaguchi; Hisaharu Hayashi
Chemistry Letters, 巻：15, 号：4, 開始ページ：513, 終了ページ：514, 1986年04月, ［査読有り］
Abstract

Photolysis of aryl-substituted germyl anions was studied by CIDEP at 77 K. The emmision pattern of the spectra detected after pulsed excitation revealed a contribution of the triplet mechanism.
Oxford University Press (OUP), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/cl.1986.513
DOI ID：10.1246/cl.1986.513, ISSN：0366-7022, eISSN：1348-0715, Web of Science ID：WOS:A1986C049400022

LASER-PHOTOLYSIS STUDY OF ARYL-SUBSTITUTED GERMYL ANIONS　　　　　　　　　　　　　　　
Kunio Mochida; Masanobu Wakasa; Shin-ichi Ishizaka; Masahiro Kotani; Yoshio Sakaguchi; Hisaharu Hayashi
Chemistry Letters, 巻：14, 号：11, 開始ページ：1709, 終了ページ：1710, 1985年11月, ［査読有り］
Abstract

Photochemical primary processes of aryl-substituted germyl anions were studied at room temperature. The germyl radicals generated were observed directly by laser-photolysis.
Oxford University Press (OUP), 英語, 研究論文（学術雑誌）
DOI：https://doi.org/10.1246/cl.1985.1709
DOI ID：10.1246/cl.1985.1709, ISSN：0366-7022, eISSN：1348-0715, Web of Science ID：WOS:A1985AUX8000031

■ MISC

磁場による触媒反応の制御　　　　　　　　　　　　　　　
若狭雅信; 谷本能文
触媒, 巻：46, 号：3, 開始ページ：224, 終了ページ：229, 2016年12月01日, ［招待有り］, ［筆頭著者, 責任著者］
日本語, 記事・総説・解説・論説等（学術雑誌）

磁場とナノ細孔を用いた複合反応場での光化学反応制御　　　　　　　　　　　　　　　
若狭雅信
総合研究機構研究プロジェクト研究成果報告書, 巻：6(平成19年度), 2008年

磁場とナノ細孔を用いた複合反応場での光化学反応制御　　　　　　　　　　　　　　　
若狭雅信
巻：6(平成19年度), 2008年

イオン液体中での光化学反応と磁場効果　　　　　　　　　　　　　　　
若狭雅信
総合研究機構研究プロジェクト研究成果報告書, 号：5(18年度), 開始ページ：525, 終了ページ：526, 2007年

イオン液体中での光化学反応と磁場効果　　　　　　　　　　　　　　　
若狭雅信
号：5(18年度), 開始ページ：525, 終了ページ：526, 2007年

光触媒反応の磁場効果とメカニズム解明　　　　　　　　　　　　　　　
若狭雅信
総合研究機構研究プロジェクト研究成果報告書, 号：4(17年度), 2006年

光触媒反応の磁場効果とメカニズム解明　　　　　　　　　　　　　　　
若狭雅信
号：4(17年度), 2006年

New magnetic field effects observed in micellar and fluid solutions under ultrahigh fields of up to 30 T　　　　　　　　　　　　　　　
H. Hayashi; Y. Sakaguchi; M. Wakasa; Y. Mori; K. Nishizawa
巻：18, 号：3, 開始ページ：307, 終了ページ：319, 2000年03月, ［査読有り］, ［招待有り］

■ 書籍等出版物

化合物から理解する大学の有機化学 : 必要な機器分析とともに
若狭, 雅信, ［編者(編著者)］
丸善出版, 2023年10月
日本語, 総ページ数：viii, 252p
CiNii Books：http://ci.nii.ac.jp/ncid/BD04629958
ISBN：9784621308615, CiNii Books ID：BD04629958

大学の基礎化学 : 必要な物理・数学とともに
若狭, 雅信, ［編者(編著者)］
丸善出版, 2021年11月
日本語, 総ページ数：1 online resource (ix, 240p)
CiNii Books：http://ci.nii.ac.jp/ncid/BD07928875
ISBN：9784621306475, CiNii Books ID：BD07928875

Encyclopedia of Physical Organic Chemistry, 6 Volume Set　　　　　　　　　　　　　　　
Masanobu Wakasa; Tomoaki Yago; Atom Hamasaki; Masao Gohdo, ［分担執筆］
John Wiley & Sons, 2017年04月
ロシア語, 総ページ数：246 p.
CiNii Books：http://ci.nii.ac.jp/ncid/BD0444980X
ISBN：9781118468586, CiNii Books ID：BD0444980X

■ 共同研究・競争的資金等の研究課題

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競争的資金

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競争的資金

理工学研究科物質科学部門	教授
理学部基礎化学科	学部長

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若狭 雅信（ワカサ マサノブ）理工学研究科 物質科学部門教授理学部 基礎化学科学部長

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業績情報

若狭　雅信（ワカサ　マサノブ）
理工学研究科物質科学部門教授
理学部基礎化学科学部長