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SAITOH　Hideki
Material Science DivisionLecturer
Chemistry

  • E-Mail：saitohchem.saitama-u.ac.jp

Researcher information

■ Degree
  • Dr.(Sci.), Tokyo Metropolitan University
    Mar. 1994
■ Research Keyword
  • X-ray structure determination
  • Molecular crystal
■ Field Of Study
  • Nanotechnology/Materials, Functional solid-state chemistry
  • Nanotechnology/Materials, Basic physical chemistry
■ Educational Background
  • Mar. 1994, Tokyo Metropolitan University, Graduate School of Science, Department of Chemistry, Japan
  • Mar. 1991, Tokyo Metropolitan University, Graduate School of Science, Department of Chemistry, Japan
  • Mar. 1989, Tokyo Metropolitan University, Faculty of Science, Department of Chemistry, Japan

Performance information

■ Paper
  • Ordering Phase Transition with Symmetry-Breaking from Disorder over Non-Equivalent Sites: Calorimetric and Crystallographic Study of Crystalline d-Sorbose
    Sakiko Iwagaki; Hiroki Kakuta; Yasuhisa Yamamura; Hideki Saitoh; MAFUMI HISHIDA; Kazuhiro Fukada; Kazuya SAITO
    Crystals, May 2020, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.3390/cryst10050361
    DOI ID：10.3390/cryst10050361, ORCID：73422127
  • Structure and molecular packing in smectic B Cr and A d phases of Schiff base liquid crystal compounds through the analyses of layer spacing, entropy and crystal structure　　　　　　　　　　　　　　　
    Hideki Saitoh
    Physical Chemistry Chemical Physics, 2017, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1039/C7CP03863A
    DOI ID：10.1039/C7CP03863A, ORCID：57774441, Web of Science ID：WOS:000406334300064
  • Cell-quintupling: Structural phase transition in a molecular crystal, bis(trans-4-butylcyclohexyl) methanol　　　　　　　　　　　　　　　
    Saito, Kazuya; Ikeda, Takaaki; Yamamura, Yasuhisa; Saitoh, Hideki; Hishida, Mafumi; Kobayashi, Yutaro; Fujita, Takeshi; Ichikawa, Junji
    Journal of Chemical Physics, Volume：146, Number：7, First page：74503, Last page：74503, 2017, [Reviewed]
    A structural phase transition at 151.6 K of the title compound [bis(trans-4–butylcyclohexyl)methanol] is examined by X-ray diffraction crystallography, Fourier-transform infrared spectroscopy, and adiabatic calorimetry. A general consideration on possible superstructures indicates that a single modulation wave is sufficient to drive this cell-quintupling transition. The entropy of transition determined calorimetrically indicates that two conformations are dominant in the room-temperature phase in contrast to the fivefold disorder expected from the structure of the low-temperature phase.
    English, Scientific journal
    DOI：https://doi.org/10.1063/1.4976318
    DOI ID：10.1063/1.4976318, ISSN：0021-9606, CiNii Articles ID：120006224115, CiNii Books ID：AA00694991, ORCID：34659311, Web of Science ID：WOS:000394579500016
  • Universality of Molten State of Alkyl Chain in Liquid-Crystalline Mesophases: Smectic E Phase of 6-Alkyl-2-phenylazulene　　　　　　　　　　　　　　　
    Adachi, Takuya; Saitoh, Hideki; Yamamura, Yasuhisa; Hishida, Mafumi; Ueda, Mao; Ito, Shunji; Saito, Kazuya
    Bulletin of the Chemical Society of Japan, Volume：86, Number：9, First page：1022, Last page：1027, 2013, [Reviewed]
    Through thermodynamic, spectroscopic, and structural studies, the molten state of the alkyl chain in SmE phase, which is the liquid-crystalline mesophase closest to an ordered crystalline phase, has been established in a calamitic mesogen nPA. Combining the same conclusion for the SmE phase of another calamitic mesogen nTCB, it is concluded that the alkyl chain attached at end(s) of a rod-like core is molten in any liquid-crystalline mesophase. The thermodynamic implications are briefly discussed.
    The Chemical Society of Japan, English, Scientific journal
    DOI：https://doi.org/10.1246/bcsj.20130122
    DOI ID：10.1246/bcsj.20130122, ISSN：0009-2673, CiNii Articles ID：10031194295, CiNii Books ID：AA00580132, ORCID：34658132, Web of Science ID：WOS:000326413100002
  • Reassessment of structure of smectic phases: Nano-segregation in smectic E phase in 4-n-alkyl-4 '-isothiocyanato-1,1 '-biphenyls　　　　　　　　　　　　　　　
    Saito, Kazuya; Miyazawa, Takahito; Fujiwara, Akio; Hishida, Mafumi; Saitoh, Hideki; Massalska-Arodz, Maria; Yamamura, Yasuhisa
    Journal of Chemical Physics, Volume：139, Number：11, First page：114902, Last page：114902, 2013, [Reviewed]
    Based on new diffraction data from aligned samples of smectic E (SmE) phase of 4-n-alkyl-4′-isothiocyanato-1,1′-biphenyls, systematics against the alkyl chain length n is analyzed. In order to perform the analysis, the molecular form factor approximated by a box-shaped distribution is calculated while taking the rounding of the distribution at corners into account. The analysis clearly shows the nano-segregated layered structure, which does not fit to the traditional structural view of SmE phase but does fit to the model the present authors proposed recently. Some implications of this conclusion are discussed in relation to the importance of the molten state of alkyl chains in most of real mesogens revealed previously through thermodynamic analyses.
    American Institute of Physics, English, Scientific journal
    DOI：https://doi.org/10.1063/1.4821162
    DOI ID：10.1063/1.4821162, ISSN：0021-9606, CiNii Articles ID：120005343966, CiNii Books ID：AA00694991, ORCID：34658131, Web of Science ID：WOS:000324827800037
  • Structure and properties of constituents in hexane extract of frankincense　　　　　　　　　　　　　　　
    Hasegawa, Toshio; Kikuchi, Akiko; Saitoh, Hideki; Yamada, Hideo
    Journal of Essential Oil Research, Volume：24, Number：6, 2012, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1080/10412905.2012.742468
    DOI ID：10.1080/10412905.2012.742468, ORCID：34658134, Web of Science ID：WOS:000311554000013
  • New Organic Ferroelectrics: Cocrystal of 5,5 '-Dimethyl-2,2 '-bipyridine and Bromanilic Acid　　　　　　　　　　　　　　　
    Yamamura, Yasuhisa; Saito, Erika; Saitoh, Hideki; Hoshino, Norie; Saito, Kazuya
    Chemistry Letters, Volume：41, Number：1, First page：119, Last page：121, 2012, [Reviewed]
    Cocrystal 55DMBPH2ba was synthesized and characterized. The crystal structure is isostructural to cocrystal 55DMBPH2ia with iodanilic acid. The heat capacity, dielectric permittivity, and polarizationelectric field hysteresis showed that the 55DMBPH2ba undergoes a paraelectricferroelectic phase transition at 253K on cooling. The transition mechanism is discussed through the analysis of isotropic temperature factors of atoms. © 2012 The Chemical Society of Japan.
    Scientific journal
    DOI：https://doi.org/10.1246/cl.2012.119
    Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84855324412&origin=inward
    Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84855324412&origin=inward
    DOI ID：10.1246/cl.2012.119, ISSN：0366-7022, eISSN：1348-0715, ORCID：34658133, SCOPUS ID：84855324412, Web of Science ID：WOS:000300480400041
  • Solid-State Thiotropolone: An Extremely Rapid Intramolecular Proton Transfer　　　　　　　　　　　　　　　
    Machiguchi, Takahisa; Hasegawa, Toshio; Saitoh, Hideki; Yamabe, Shinichi; Yamazaki, Shoko
    Journal of Organic Chemistry, Volume：76, Number：13, 2011, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1021/jo2005796
    DOI ID：10.1021/jo2005796, ORCID：34658136, Web of Science ID：WOS:000291920900032
  • Negative thermal expansion emerging upon structural phase transition in ZrV2O7 and HfV2O7　　　　　　　　　　　　　　　
    Yamamura, Yasuhisa; Horikoshi, Aruto; Yasuzuka, Syuma; Saitoh, Hideki; Saito, Kazuya
    Dalton Transactions, Volume：40, Number：10, First page：2242, Last page：2248, 2011, [Reviewed]
    ZrV2O7 and HfV2O7, which show negative thermal expansion (NTE) in the high-temperature phase, were investigated using X-ray diffraction and heat capacity calorimetry. Two sharp anomalies due to successive phase transitions were observed in the temperature dependence of heat capacity at 345.5 K and 373.4 K for ZrV2O7and 341.8 K and 370.3 K for HfV2O7. The smallness of their combined entropies of transition suggested that the phase transitions are of displacive type. Effective phonon densities of states (DOS) described by a simple model, and mode-Grüneisen parameters of the low-temperature phase were obtained through the spectrum analyses of heat capacities of ZrV2O7and HfV2O7. Their effective phonon DOS's show the three features common to NTE compounds: low-energy phonon mode, high-energy phonon mode, and a wide phonon gap in between. The mode-Grüneisen parameter of low-energy modes corresponding to translational and librational vibrations of the constituent polyhedra is negative but with a small absolute value due to the distortion of V2O7group in the low-temperature phase, resulting in positive thermal expansion. It is revealed that the release of the structural distortion upon the successive phase transitions with large volume increase leads to the NTE of ZrV2O7and HfV2O7in the high-temperature phase. © 2011 The Royal Society of Chemistry.
    Scientific journal
    DOI：https://doi.org/10.1039/c0dt01087a
    DOI ID：10.1039/c0dt01087a, ISSN：1477-9226, ORCID：34658135, SCOPUS ID：79951877720, Web of Science ID：WOS:000287665000024
  • Effects of Alkyl Length in Ligands in Mixed Valence MMX Complexes: Properties of Pt 2 ( n -HexCS 2 ) 4 I ( n -Hex = n -Hexyl Group)　　　　　　　　　　　　　　　
    Kazuya Saito; Tooru Atake; Hideki Saitoh; Koshiro Toriumi; Minoru Mitsumi; Yasuhisa Yamamura; Satoaki Ikeuchi
    Chemistry Letters, Volume：38, Number：12, First page：1190, Last page：1191, 2009, [Reviewed]
    English, Scientific journal
    DOI ID：10.1246/CL.2009.1190, ISSN：0366-7022, CiNii Articles ID：10027175973, CiNii Books ID：AA00603318, ORCID：57774457, Web of Science ID：WOS:000273859200032
  • One-dimensional correlation in the dipolar Ising crystal tricyclohexylmethanol: crystal structure revisited and heat capacity　　　　　　　　　　　　　　　
    Yasuhisa Yamamura; Hideki Saitoh; Masato Sumita; Kazuya Saito
    JOURNAL OF PHYSICS-CONDENSED MATTER, Volume：19, Number：17, First page：176219, May 2007
    The crystal structure of an organic weak-ferroelectrics, tricyclohexylmethanol (TCHM), was re-examined by single-crystal x-ray diffraction at room temperature. TCHM forms a dimer through hydrogen bonding at the centre of the dimer, where two hydroxyl groups are arranged in tandem and their direction is disordered in two possible orientations, which brings about a dipolar Ising nature. The heat capacity measured by adiabatic calorimetry from 6 to 400 K shows three anomalies including fusion at 368 K. The entropy of the ferroelectric transition is 1.9 J K-1 mol(-1), supporting the order - disorder mechanism of dimer dipoles. A broad anomaly at 348 K is related to the breakage of the intra-dimer hydrogen bond. Detailed analysis of the temperature dependence of heat capacity due to the phase transition showed the presence of a broad hump in the excess heat capacity around 160 K. The temperature dependences of the excess heat capacity and the existing dielectric constant can be analysed in terms of a highly anisotropic Ising model.
    IOP PUBLISHING LTD, English, Scientific journal
    DOI：https://doi.org/10.1088/0953-8984/19/17/176219
    DOI ID：10.1088/0953-8984/19/17/176219, ISSN：0953-8984, eISSN：1361-648X, Web of Science ID：WOS:000246556400031
  • Low-Temperature Heat Capacity of Tricyclohexylmethanol　　　　　　　　　　　　　　　
    Yamamura Yasuhisa; Amano Kenichi; Saitoh Hideki; Saito Kazuya
    Abstract book of Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, Volume：2006, First page：141, Last page：141, 2006
    Organizing Committee of Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, English
    DOI：https://doi.org/10.11533/rcbjsf.2006.0.141.0
    DOI ID：10.11533/rcbjsf.2006.0.141.0, CiNii Articles ID：130004661583
  • Successive phase transitions of p-methylbenzyl alcohol crystal studied by X-ray and adiabatic calorimetry - Structural disorder in room-temperature phase　　　　　　　　　　　　　　　
    H Saitoh; S Ikeuchi; K Saito
    JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, Volume：81, Number：3, First page：511, Last page：521, Aug. 2005
    Crystal structures of the room-temperature (RT) and low-temperature (LT) phases of p-methylbenzyl alcohol were reexamined by single-crystal X-ray diffraction method while paying special attention to detect structural disorder in the RT phase involved in successive structural phase transitions at 179 and 210 K. In the RT phase at 250 K, positional disorder of oxygen atoms was detected in contrast to the previous structure report. The structure of the LT phase coincided to the previous one. Heat capacities were measured by adiabatic calorimetry below 350 K, which covers the structural phase transitions and fusion at 331.87 K. The structural phase transitions were of first-order and required long time for completion. The combined magnitude of entropies of transition was ca. 5 J K-1 mol(-1), a part of which can be ascribed to the positional disorder observed in the structure analysis. Standard thermodynamic functions are tabulated below 350 K.
    SPRINGER, English, Scientific journal
    DOI：https://doi.org/10.1007/s10973-005-0814-3
    DOI ID：10.1007/s10973-005-0814-3, ISSN：1388-6150, Web of Science ID：WOS:000231760500003
  • Effect of intramolecular pi-pi and CH-pi interactions between ligands on structure, electrochemical and spectroscopic properties of fac-[Re(bpy)(CO)(3)(PR3)](+) (bpy=2,2 '-bipyridine; PR3 = trialkyl or triarylphosphines)　　　　　　　　　　　　　　　
    Tsubaki, H.; Tohyama, S.; Koike, K.; Saitoh, H.; Ishitani, O.
    Dalton Transactions, Number：2, 2005, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1039/b407947g
    DOI ID：10.1039/b407947g, ORCID：34658139, Web of Science ID：WOS:000225889400024
  • Spatially modulated refractive indices and optical filter characteristics in the light-induced metastable state of Na-2[Fe(CN)(5)NO]center dot 2H(2)O　　　　　　　　　　　　　　　
    Y Morioka; H Saitoh; H Machida
    JOURNAL OF PHYSICAL CHEMISTRY A, Volume：106, Number：14, First page：3517, Last page：3523, Apr. 2002
    The metastable state of Na-2[Fe(CN)(5)NO].2H(2)O crystals produced by irradiation with green or blue laser light was investigated using X-ray diffraction and spectroscopic methods. A thin crystalline plate in the metastable state placed between a pair of polarizers behaves like an optical filter. It works as the band-pass or band-reject filter, depending on the cross or parallel alignment of polarizers. A remarkable point of this effect is that the band center corresponds with the wavelength of the laser applied for producing the metastable state. This phenomenon is explained based on spatially modulated refractive indices produced by the photorefractive effect of laser irradiation. Numerical calculations using Berreman's 4x4 matrix method show that the spatially modulated population of the metastable anion exists even in the photostationary state, Similarity with the Solc birefringent filter is also discussed.
    AMER CHEMICAL SOC, English, Scientific journal
    DOI：https://doi.org/10.1021/jp0127667
    DOI ID：10.1021/jp0127667, ISSN：1089-5639, CiNii Articles ID：80015213760, Web of Science ID：WOS:000175021900033
  • Molecular Aggregation States and Polymerizability of Potassium and Calcium 10-Undecenoates in Aqueous Systems　　　　　　　　　　　　　　　
    Shibasaki, Yoshio; Saitoh, Hideki; Fujimori, Atsuhiro
    Studies in Surface Science and Catalysis, Volume：132, First page：181, Last page：184, 2001, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1016/S0167-2991(01)82064-4
    DOI ID：10.1016/S0167-2991(01)82064-4, ORCID：34658142
  • Synthesis and properties of [Ru(tpy)(4,4 '-X(2)bpy)H](+) (tpy=2,2 ': 6 ',2 ''-terpyridine, bpy=2,2 '-bipyridine, X = H and MeO), and their reactions with CO2　　　　　　　　　　　　　　　
    Konno, H.; Kobayashi, A.; Sakamoto, K.; Fagalde, F.; Katz, NE; Saitoh, H.; Ishitani, O.
    Inorganica Chimica Acta, Volume：299, Number：2, 2000, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1016/S0020-1693(99)00488-0
    DOI ID：10.1016/S0020-1693(99)00488-0, ORCID：34658147, Web of Science ID：WOS:000085930100005
  • Study on thermal degradation mechanisms of comb polyacrylates containing long fluorocarbon side chains by TG/FTIR　　　　　　　　　　　　　　　
    Shi, L.; Saitoh, H.; Shibasaki, Y.
    Journal of Polymer Science Part a-Polymer Chemistry, Volume：38, Number：15, 2000, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1002/1099-0518(20000801)38:15<2794::AID-POLA200>3.3.CO;2-0
    DOI ID：10.1002/1099-0518(20000801)38:15<2794::AID-POLA200>3.3.CO;2-0, ORCID：34658146, Web of Science ID：WOS:000088202300020
  • New synthetic routes to biscarbonylbipyridinerhenium(I) complexes cis,trans-[Re(X(2)bpy)(CO)(2)(PR3)(Y)](n+) (X(2)bpy=4,4 '-X-2-2,2 '-bipyridine) via photochemical ligand substitution reactions, and their photophysical and electrochemical properties　　　　　　　　　　　　　　　
    Koike, K.; Tanabe, J.; Toyama, S.; Tsubaki, H.; Sakamoto, K.; Westwell, JR; Johnson, FPA; Hori, H.; Saitoh, H.; Ishitani, O.
    Inorganic Chemistry, Volume：39, Number：13, 2000, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1021/ic991190l
    DOI ID：10.1021/ic991190l, ORCID：34658145, Web of Science ID：WOS:000087905000012
  • Investigation of the thermal degradation mechanisms of poly(styrene-co-methacrylonitrile)s by flash pyrolysis and TG-FTIR measurements　　　　　　　　　　　　　　　
    Yang, M.; Tsukame, T.; Saitoh, H.; Shibasaki, Y.
    Polymer Degradation and Stability, Volume：67, Number：3, 2000, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1016/S0141-3910(99)00148-2
    DOI ID：10.1016/S0141-3910(99)00148-2, ORCID：34658144, Web of Science ID：WOS:000084957000011
  • Characterization of poly(styrene-co-methacrylonitrile)s obtained by low-temperature radiation polymerization and thermal degradation behavior measured by Py-GC and CRTG　　　　　　　　　　　　　　　
    Yang, M.; Tsukame, T.; Saitoh, H.; Yoshida, H.; Shibasaki, Y.
    Journal of Polymer Science Part a-Polymer Chemistry, Volume：38, Number：19, 2000, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1002/1099-0518(20001001)38:19<3569::AID-POLA120>3.3.CO;2-F
    DOI ID：10.1002/1099-0518(20001001)38:19<3569::AID-POLA120>3.3.CO;2-F, ORCID：34658143, Web of Science ID：WOS:000089199800012
  • Polymorphism of acrylic and methacrylic acid esters containing long fluorocarbon chains and their polymerizability　　　　　　　　　　　　　　　
    A Fujimori; H Saitoh; Y Shibasaki
    JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, Volume：57, Number：3, First page：631, Last page：642, Sep. 1999, [Reviewed]
    The molecular aggregation of acrylic and methacrylic acid esters containing long-fluorocarbon chains: 2-(perfluoroalkyl)ethyl acrylate (FF(n)EA) and 2-(perfluoroalkyl)ethyl methacrylate (FF(n)EMA) (F(CF2)(n)CH2CH2OCOC(X)=CH2, where X=H, CH3 and n=6, 8, 10) was investigated by differential scanning calorimetry (DSC) and temperature controlled X-ray powder diffraction measurement. These compounds exhibited some characteristic polymorphic behaviors depending on the length of fluorocarbon chain and the alpha-position methyl group. The solid-state polymerization by gamma-ray irradiation was studied for these compounds in the various crystal forms. In the solid-state polymerization, highest polymerizability was observed in the crystal form that exists in the highest temperature region for each compound.
    SPRINGER, English, Scientific journal
    ISSN：1388-6150, eISSN：1572-8943, Web of Science ID：WOS:000083716900002
  • Identification of polyethylene by differential scanning calorimetry - Application to forensic science　　　　　　　　　　　　　　　
    Tsukame, T.; Kutsuzawa, M.; Sekine, H.; Saitoh, H.; Shibasaki, Y.
    Journal of Thermal Analysis and Calorimetry, Volume：57, Number：3, 1999, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1023/A:1010106612095
    DOI ID：10.1023/A:1010106612095, ORCID：34658148, Web of Science ID：WOS:000083716900024
  • Polymorphism of acrylic and methacrylic acid esters containing long fluorocarbon chains and their polymerizability　　　　　　　　　　　　　　　
    Fujimori, A.; Saitoh, H.; Shibasaki, Y.
    Journal of Thermal Analysis and Calorimetry, Volume：57, Number：3, First page：631, Last page：642, 1999, [Reviewed]
    English, Scientific journal
    DOI：https://doi.org/10.1023/A:1010113420330
    DOI ID：10.1023/A:1010113420330, ISSN：1418-2874, CiNii Articles ID：80010762575, ORCID：34658150, Web of Science ID：WOS:000083716900002
  • Radiation Polymerization of Functional Monomers in Oriented Molecular System (配向分子集合系における単量体分子の放射線重合(II))　　　　　　　　　　　　　　　
    Y. Shibasaki; H. Saitoh; I. Hattori; Y. Ming; A. Fujimori
    First page：17, Last page：22, 1999
  • Influence of molecular arrangement on the gamma-ray-irradiation solid-state polymerization of 1-octadecyl vinyl ether with a characteristic polymorphism　　　　　　　　　　　　　　　
    Fujimori, A; Saitoh, H; Shibasaki, Y
    Journal of Polymer Science Part a-Polymer Chemistry, Volume：37, Number：20, First page：3845, Last page：3853, 1999, [Reviewed]
    The polymorphic behavior of 1-octadecyl vinyl ether was investigated by DSC and X-ray diffraction measurements under various temperatures. In DSC measurement of 1-octadecyl vinyl ether in the temperature range of -30 to approximately 50 degrees C, four transition peaks were observed on heating, whereas three transition peaks appeared on cooling. The phase-transition behavior was investigated by the repeating scanning DSC measurements. It was concluded that this compound exhibited four crystalline modifications: alpha, sub alpha, beta(0), and beta(1). It was confirmed by the temperature-controlled X-ray diffraction measurement that these phase transitions are attributed to the change of crystal systems from hexagonal packing (alpha form) to a distorted orthorhombic (O perpendicular to') system (beta(1) form) via orthorhombic (O perpendicular to) (sub alpha form) and intermediate beta(0) form, although the beta(0) form has not yet been clarified. In the gamma-ray-irradiation solid-state polymerization for these crystal forms of this compound, the polymerizability of the sub alpha form is higher than that of other forms, and that of the a form is lowest. The polymerizability demonstrated an unusual increase at a temperature of -83.6 degrees C, probably because the cationic polymerization mechanism is dominant over that of the free radical. (C) 1999 John Wiley & Sons, Inc.
    JOHN WILEY & SONS INC, English, Scientific journal
    DOI：https://doi.org/10.1002/(SICI)1099-0518(19991015)37:20<3845::AID-POLA13>3.0.CO;2-P
    DOI ID：10.1002/(SICI)1099-0518(19991015)37:20<3845::AID-POLA13>3.0.CO;2-P, ISSN：0887-624X, CiNii Articles ID：80011348517, ORCID：34658149, Web of Science ID：WOS:000082937500013
  • Synthesis, structure and redox chemistry of 1,2-bis(ruthenocenyl)-ethylene derivatives: a novel structural rearrangement to a (mu-eta(6):eta(6)-pentafulvadiene)diruthenium complex upon two-electron oxidation　　　　　　　　　　　　　　　
    Sato, M.; Kawata, Y.; Kudo, A.; Iwai, A.; Saitoh, H.; Ochiai, S.
    Journal of the Chemical Society-Dalton Transactions, Number：13, 1998, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1039/a801941j
    DOI ID：10.1039/a801941j, ORCID：34658152, Web of Science ID：WOS:000074924300017
  • Effect of gamma-ray irradiation on polystyrene, poly(methyl methacrylate), and their copolymer prepared by cast polymerization　　　　　　　　　　　　　　　
    Tsukame, T; Kutsuzawa, M; Saitoh, H; Shibasaki, Y
    Kobunshi Ronbunshu, Volume：55, Number：8, First page：433, Last page：439, 1998, [Reviewed]
    Effect of γ-ray irradiation on polystyrene (PS), poly (methyl methacrylate) (PMMA), and their copolymer prepared by cast polymerization was studied using size exclusion chromatography. The main chemical reactions in irradiated polymers were crosslinking and scission. Conversion of all irradiated samples increased regardless of the concentration of initiator (AIBN) used for cast polymerization. On γ-ray irradiation, the molecular weight of PS increased and its distribution broadened, whereas the molecular weight of PMMA decreased. These phenomena should be attributable to the competitive occurrence of scission and crosslinking in PS by γ-ray irradiation, whereas scission occurred mainly in PMMA.
    The Society of Polymer Science, Japan, Japanese, Scientific journal
    DOI：https://doi.org/10.1295/koron.55.433
    DOI ID：10.1295/koron.55.433, ISSN：0386-2186, CiNii Articles ID：130003837618, ORCID：34658151, Web of Science ID：WOS:000075600000001
  • Characterization of microstructure of polyethylenes by differential scanning calorimetry　　　　　　　　　　　　　　　
    Tsukame, T.; Ehara, Y.; Shimizu, Y.; Kutsuzawa, M.; Saitoh, H.; Shibasaki, Y.
    Thermochimica Acta, Volume：299, Number：1-2, 1997, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1016/S0040-6031(97)00132-9
    DOI ID：10.1016/S0040-6031(97)00132-9, ORCID：34658153, Web of Science ID：WOS:A1997XY79300006
  • DSC and X-ray studies on side-chain crystallization of comb-like polymers - Fluorinated n-alkyl acrylate and methacrylate polymers　　　　　　　　　　　　　　　
    Shibasaki, Y.; Saitoh, H.; Chiba, K.
    Journal of Thermal Analysis, Volume：49, Number：1, First page：115, Last page：121, 1997, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1007/BF01987428
    DOI ID：10.1007/BF01987428, ISSN：0368-4466, CiNii Articles ID：80009657641, ORCID：34658154, Web of Science ID：WOS:A1997XD48000014
  • A structural rearrangement on the oxidation of 1,2-bis(ruthenocenyl)ethylene derivatives leads to unprecedented (mu-eta(6):eta(6)-pentafulvadiene)diruthenium complexes　　　　　　　　　　　　　　　
    Sato, M.; Kudo, A.; Kawata, Y.; Saitoh, H.
    Chemical Communications, Number：1, 1996
    Scientific journal
    DOI：https://doi.org/10.1039/cc9960000025
    DOI ID：10.1039/cc9960000025, ORCID：34658155, Web of Science ID：WOS:A1996UG03500010
  • ORGANIC METAL (DIMET)(2)BF4　　　　　　　　　　　　　　　
    H SAITOH; K SAITO; H ITOH; T MOCHIDUKI; K KIKUCHI; IKEMOTO, I
    ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, Volume：51, Number：8, First page：1656, Last page：1658, Aug. 1995
    The crystal structure of bis[2-(4,5-dimethyl-1,3-dithiol-2-ylidene)-5,6-dihydro-1,3-dithiolo[4,5-b][1,4]dithiin]ylium tetrafluoroborate, 2(C10H10S60.5+) BF4-, is constructed Of two types of column which consist of donor molecules stacked along two crystallographic axes.
    MUNKSGAARD INT PUBL LTD, English, Scientific journal
    DOI：https://doi.org/10.1107/S0108270195001806
    DOI ID：10.1107/S0108270195001806, ISSN：0108-2701, CiNii Articles ID：80008515175, Web of Science ID：WOS:A1995RW83000073
  • HEAT-CAPACITY MEASUREMENTS AND PHASE-TRANSITION OF CRYSTALLINE 4,4''-DIFLUORO-P-TERPHENYL　　　　　　　　　　　　　　　
    Y YAMAMURA; K SAITO; H SAITOH; H MATSUYAMA; K KIKUCHI; IKEMOTO, I
    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, Volume：56, Number：1, First page：107, Last page：115, Jan. 1995, [Reviewed]
    The heat capacity of 4,4''-difluoro-p-terphenyl was measured between 8 and 303 K by adiabatic calorimetry. A phase transition associated with molecular twisting was observed as a sharp peak at (127.05 +/- 0.05) K. The enthalpy and the entropy of transition were determined as (180 +/- 20) J mol(-1) and (1.41 +/- 0.15)J K-1 mol(-1), respectively. It is pointed out that this phase transition lies in the border region between an order-disorder and displacive-type transition under normal pressure. The apparatus used for calorimetry is described.
    PERGAMON-ELSEVIER SCIENCE LTD, English, Scientific journal
    ISSN：0022-3697, eISSN：1879-2553, Web of Science ID：WOS:A1995QL72900015
  • PHASE-TRANSITION IN CRYSTALLINE P-POLYPHENYLS - HEAT-CAPACITY OF 4,4'''-DIFLUORO-P-QUATERPHENYL　　　　　　　　　　　　　　　
    K SAITO; Y YAMAMURA; H SAITOH; H MATSUYAMA; K KIKUCHI; IKEMOTO, I
    SOLID STATE COMMUNICATIONS, Volume：92, Number：6, First page：495, Last page：499, Nov. 1994, [Reviewed]
    The heat capacity of crystalline 4,4'''-difluoro-p-quaterphenyl was measured from 8 K to 303 K by adiabatic calorimetry. A broad anomaly was detected between 140 and 50 K and attributed to a sinrctural phase transition associated with molecular twisting. The temperature, the enthalpy and the entropy of transition were detemined as (200.5 +/- 0.5) K, (322 +/- 20) J mol-1 and (1.65 +/- 0.10) J.K-1.mol(-1), respectiveIy. The properties of the transition are compared with those of unsubstituted and fluorine-substituted p-polyphenyls (of two to four benzene rings in a molecule) in the Light of a unified model of displacive and order-disorder types of structural phase transition.
    PERGAMON-ELSEVIER SCIENCE LTD, English, Scientific journal
    ISSN：0038-1098, Web of Science ID：WOS:A1994PM80100007
  • X-RAY STUDY ON STRUCTURAL PHASE-TRANSITIONS OF 4,4''-DIFLUORO-P-TERPHENYL AND 4,4'''-DIFLUORO-P-QUATERPHENYL　　　　　　　　　　　　　　　
    H SAITOH; K SAITO; Y YAMAMURA; H MATSUYAMA; K KIKUCHI; IKEMOTO, I
    SOLID STATE COMMUNICATIONS, Volume：91, Number：2, First page：89, Last page：92, Jul. 1994
    Low-temperature X-ray diffraction experiments were performed on 4,4''-difluoro-p-terphenyl (DFTP) and 4,4'''-difluoro-p-quaterphenyl (DFQP). The structure analyses were performed for the high-temperature phases and the librational motion of the benzene rings was analyzed. The super-lattice reflections were found in DFQP below about 200 K on the same positions as the low-temperature phase of p-quaterphenyl. In DFTP, the satellite reflections with small wavevector component delta(c) (about 1/6) along the c*-axis were found below the transition temperature.
    PERGAMON-ELSEVIER SCIENCE LTD, English, Scientific journal
    DOI：https://doi.org/10.1016/0038-1098(94)90259-3
    DOI ID：10.1016/0038-1098(94)90259-3, ISSN：0038-1098, CiNii Articles ID：80007675313, Web of Science ID：WOS:A1994NX94300002
  • PHASE-TRANSITION ASSOCIATED WITH MOLECULAR TWISTING IN CRYSTALLINE 4,4''-DIFLUORO-P-TERPHENYL DISPLACIVE OR ORDER-DISORDER TRANSITION　　　　　　　　　　　　　　　
    SAITO, K; YAMAMURA, Y; SAITOH, H; MATSUYAMA, H; KIKUCHI, K; IKEMOTO, I
    Solid State Communications, Volume：87, Number：10, First page：903, Last page：906, 1993, [Reviewed]
    The heat capacity of crystalline 4,4''-difluoro-p-terphenyl was measured from 8 K to 303 K by adiabatic calorimetry. The anomaly with a peak at (127.05 +/- 0.05) K due to a structural phase transition was detected between 100 and 160 K. The enthalpy and the entropy of transition were determined as (180 +/- 20) J.mol-1 and (1.41 +/- 0.15) J.K-1.mol-1, respectively. The properties of the transition are compared with those of p-terphenyl. The possibility is pointed out that an transition in the present compound lies in the ''transition'' region from order-disorder to a displacive type of structural phase transition.
    PERGAMON-ELSEVIER SCIENCE LTD, English, Scientific journal
    DOI：https://doi.org/10.1016/0038-1098(93)90726-4
    DOI ID：10.1016/0038-1098(93)90726-4, ISSN：0038-1098, CiNii Articles ID：80007257121, ORCID：34658161, Web of Science ID：WOS:A1993LZ00300007
  • CRYSTAL-STRUCTURES OF THE ROOM-TEMPERATURE PHASE OF 4,4''-DIFLUORO-P-TERPHENYL AND 4,4'''-DIFLUORO-P-QUATERPHENYL　　　　　　　　　　　　　　　
    SAITOH, H; SAITO, K; YAMAMURA, Y; MATSUYAMA, H; KIKUCHI, K; IYODA, M; IKEMOTO, I
    Bulletin of the Chemical Society of Japan, Volume：66, Number：10, First page：2847, Last page：2853, 1993, [Reviewed]
    4,4″-Difluoro-p-terphenyl and 4,4″′-difluoro-p-quaterphenyl were synthesized and their crystal structures were determined at room temperature. These are isostructural to p-terphenyl and p-quaterphenyl, respectively. Some "disorder" in the inner benzene ring orientation was detected and resolved by the split-atom method. A rigid-body librational analysis of each benzene ring around the long molecular axis was performed. A rough estimate of the barrier height of the planar conformation for 4,4″-difluoro-p-terphenyl was obtained as being about 1 kJ mol−1. The results are compared with the properties of p-terphenyl and p-quaterphenyl, and the effect of fluorine-substitution on the molecular properties is discussed in relation to the low-temperature phase transitions.
    The Chemical Society of Japan, English, Scientific journal
    DOI：https://doi.org/10.1246/bcsj.66.2847
    DOI ID：10.1246/bcsj.66.2847, ISSN：0009-2673, CiNii Articles ID：80007282810, ORCID：34658160, Web of Science ID：WOS:A1993ME01500010
  • CRYSTAL-STRUCTURES AND PHYSICAL-PROPERTIES OF DIMET TRIIODIDES　　　　　　　　　　　　　　　
    K SAITO; M ISHIBASHI; H YOSHINO; T MOCHIDUKI; H SAITOH; H ITOH; K KIKUCHI; IKEMOTO, I
    SYNTHETIC METALS, Volume：52, Number：1, First page：87, Last page：100, Sep. 1992, [Reviewed]
    Crystals of DIMET.I3 and (DIMET)2I3 are prepared and their crystal structures determined. The crystal of DIMET.I3, consists of DIMET dimers and I3 anions. (DIMET)2I3 is isostructural with (DMET)2I3, in which the donor molecules form columns. DIMET.I3 is an insulator. The resistivity under pressure and thermoelectric power are measured for (DIMET)2I3. A metal-insulator transition is detected at about 41 K under normal pressure. Physical properties are compared with those of (DMET)2I3.
    ELSEVIER SCIENCE SA LAUSANNE, English, Scientific journal
    ISSN：0379-6779, Web of Science ID：WOS:A1992JX38300008
■ MISC
  • 15p-J-9 Structural Phase Transitions in p-Polyphenyls and Their Difluoro-Derivatives　　　　　　　　　　　　　　　
    Saito K.; Yamamura Y.; Saitoh H.; Matsuyama H.; Kikuchi K.; Ikemoto I.
    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, Volume：1993, Number：2, First page：123, Last page：123, 20 Sep. 1993
    The Physical Society of Japan (JPS), Japanese
    CiNii Articles ID：110001995378, CiNii Books ID：AN10453836
  • CONDUCTING SALTS BASED ON SOME UNSYMMETRICAL DONORS　　　　　　　　　　　　　　　
    K KIKUCHI; MOCHIDUKI, I; A YAMADA; H SAITOH; K SAITO; IKEMOTO, I; K MURATA
    SYNTHETIC METALS, Volume：42, Number：1-2, First page：1921, Last page：1924, May 1991
    The physical properties and crystal structures of some radical salts based on unsymmetrical donors: DMPT, EDT-TTF and MET have been investigated. (DMPT)2PF6 and (DMPT)2ReO4 show semiconducting behavior at room temperature and have a columnar structure with large dimerization of donors. Au(CN)2 and Ag(CN)2 salts of DMPT show metallic behavior down to 130 and 170 K, respectively. New phase of (EDT-TTF)2IBr2 has been found. It has a sharp metal-insulator transition at 80 K and a columnar structure with weaker interaction within a column rather than between columns. (EDT-TTF)2I2Br shows a metallic behavior down to 2 K but does not show superconductivity. Absence of superconductivity in this salt is considered to be due to disorder of the orientation of anions. I3 and ClO4 salts of MET show semiconducting behavior and PF6 salt shows a metallic behavior at room temperature.
    ELSEVIER SCIENCE SA LAUSANNE, English
    DOI：https://doi.org/10.1016/0379-6779(91)91982-G
    DOI ID：10.1016/0379-6779(91)91982-G, ISSN：0379-6779, Web of Science ID：WOS:A1991FV27600115
■ Lectures, oral presentations, etc.
  • 分子結晶のＸ線構造解析における多極子法電子密度解析　　　　　　　　　　　　　　　
    2009
    Poster presentation
  • ナフタレンジオール類とフェナジンで形成される共結晶中の水素結合ネットワーク　　　　　　　　　　　　　　　
    2009
    Poster presentation
  • ナフタレンジオール類とピラジンで形成される共結晶中の水素結合ネットワーク構造　　　　　　　　　　　　　　　
    2008
    Poster presentation
  • Hydrogen-bonded network structures of cocrystals of some nophthalenediol with pyrazine　　　　　　　　　　　　　　　
    2008
    Poster presentation
  • trans-3,3€',5,5€'-テトラヒドロキシスチルベン水和物結晶の水素結合ネットワーク　　　　　　　　　　　　　　　
    2007
    Poster presentation
  • Heat Capacity of Tricyclohexylmethanol　　　　　　　　　　　　　　　
    2006
    Poster presentation
  • Low-temerature Heat Capacity of Tricyclohexylmethanol　　　　　　　　　　　　　　　
    2006
    Poster presentation
  • 3,6-ジフェニル-1,2,4,5-テトラジンのサーモクロミズム　　　　　　　　　　　　　　　
    2005
    Poster presentation
  • X-ray Study on Structural Disorder in the Room-temperature Phase of p-Methylbenzyl Alcohol　　　　　　　　　　　　　　　
    2004
    Poster presentation
■ Research projects
  • ナノ空間を利用したサーモクロミズムの機構解明　　　　　　　　　　　　　　　
    2005 - 2005
    Grant amount(Total)：1500000, Direct funding：1500000
    Grant number：17036004
  • Chemistry of Sulfur-containing Heterocycles : from Three-membered to Macrocycles　　　　　　　　　　　　　　　
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), 1997 - 1999
    NAKAYAMA Juzo; NAGASAWA Akira; SUGIHARA Yoshiaki; ISHII Akihiko; SAITO Hideki; KUMAKURA Shigekazu, Saitama University
    Grant amount(Total)：12900000, Direct funding：12900000
    The following are new results developed by the present project.
    1. Sulfuration of anti- and syn-9,9'-bibenzonorbornenylidenes by elemental sulfur produced episulfides in high yields with retention of the configuration of the original alkenes.
    2. Treatment of di-1-adamantylacetylene with disulfur dichloride furnished 2,3-di-1-adamantyl-thiirene 1-oxide, 3,4-di-1-adamantyl-1,2-dithiete, and 1,2-di-1-adamantyl-2-thioxoethanone.
    3. Oxidation of tetrathiolanes, carrying two bulky substituents at the 5-position, with dimethyldioxirane, produced the corresponding tetrathiolane 3,4-dioxides, the first vic-disulfoxide isolated in pure form. The 3,4-dioxides decomposed in solution at room temperature to give dithiirane 1-oxides and a reactive species "SィイD22ィエD2O". Deoxygenation of the dithiirane 1-oxides with Lawesson's reagent provided dithiiranes.
    4. Ring inversion energies of the trithiolane and pentathiepane rings were determined. A pair of conformational isomers was synthesized by making use of high inversion barrier of the pentathiepane ring.
    5. Monocyclic thiophene 1-oxides, 1-imides, and related species were synthesized, and their structures and reactivities were investigated.
    6. The parent thiophene 1,1-dioxide and monosubstitued derivatives were synthesized and isolated for the first time, and their spectroscopic properties and reactivities were fully characterized.
    7. A wide variety of sulfur-containing large-membered heterocycles, such as thiophenophanes and crown thioethers, were synthesized.
    Grant number：09440213
  • 分子結晶の構造研究　　　　　　　　　　　　　　　
    Competitive research funding
  • -　　　　　　　　　　　　　　　
    Competitive research funding
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