Magnetic and Thermal Properties of Crystals Including Isolated Clusters. II. Heat Capacity of Co<SUB>3</SUB>(C<SUB>5</SUB>H<SUB>5</SUB>)<SUB>3</SUB>S<SUB>2</SUB> from 15 to 270 K and Mechanism of Phase Transition

スポンサーリンク

概要

• 論文の詳細を見る

• Heat capacity of Co<SUB>3</SUB>(C<SUB>5</SUB>H<SUB>5</SUB>)<SUB>3</SUB>S<SUB>2</SUB> was measured between 15 and 270 K. A phase transition was discovered at 192.5±0.1 K with the transition enthalpy and the entropy of 5253.4 J mol<SUP>−1</SUP> and 28.894 J K<SUP>−1</SUP> mol<SUP>−1</SUP>, respectively. The transition entropy is well described as the sum of the configurational entropy of <B>R</B>ln8 due to cyclopentadienyl rings and the magnetic contribution of <B>R</B>ln4. The transition behavior is satisfactorily accounted for in the whole temperature region investigated in terms of the cooperative coupling between the orientational motion of the rings and the electronic states of a molecule on the basis of the Chesnut exciton model modified by the present authors. The model proposed here is to take both the temperature dependences of the energy parameters and the inversion of the spin state at higher temperatures into account. The measurements of infrared spectra and proton magnetic resonance were made as a function of temperature. These results are favorable to the present model. The electron spin resonance experiment also confirmed the present model.

• 公益社団法人 日本化学会の論文

著者

• Seki Syuzo

  Department Of Chemistry Faculity Of Science Osaka University

• Sorai Michio

  Department Of Chemistry Faculty Of Science Osaka University

• Yoshida Toshikatsu

  Department Of Chemistry Faculty Of Integrated Arts And Sciences University Of Osaka Prefecture

• Suga Hiroshi

  Department Of Chemistry Faculty Of Science Osaka University

• SUGA Hiroshi

  Department of Chemistry, Faculty of Science, Osaka University

• Otsuka Sei

  Department of Chemistry, Faculty of Engineering Science, and Department of Polymer Science, Faculty of Science, Osaka University

• Kosaki Akio

  Department of Chemistry, Faculty of Science, Osaka University

• Yoshida Toshikatsu

  Department of Chemistry, Faculty of Engineering Science, Osaka University

• Suga Hiroshi

  Department of Chemistry and Chemical Thermodynamics Laboratory, Faculty of Science, Osaka University

関連論文

• Synthesis and Structure of Novel Thiolato-, Selenolato- or Tellurolato-Bridged 1,1'-Ferrocenediyldiplatinum Complexes
• C-H Bond Activation of the Ferrocenyl Group in the Reaction of σ-Ferrocenylplatinum Complex with Dimethyl or Diethyl Acetylenedicarboxylate
• Synthesis and Structure of Novel Metallacycle Complexes of Ruthenium Derived from 1,1'-Dialkynylferrocene
• Synthesis, Molecular Structure and Reactions of a Novel μ-σ,π-Cyclopentadienediyl Platinum-Manganese Complex
• Synthesis and Molecular Structure of 1,1'-Ferrocenediyl Bis(dimethylsilylene) Bridged Triruthenium Dihydrido Cluster, [Ru_3(μ-H)_2(μ-SiMe_2C_5H_4FeC_5H_4SiMe_)(CO)_]
• Ligand Exchange Reactions to Thienylene-Bridged Dinuclear Platinum Complex with Diphosphines. Synthesis and Molecular Structure of Diphosphine-Bridged μ-2,5-Thienylene Diplatinum Complex
• Reactions of 1-Ferrocenyl and 1,1'-Ferrocenediyl Platinum Complexes with Copper Acctylide. Synthesis and Molecular Structure of a Novel 1,1'-Ferrocenediyl Pt_2Cu_3 Acetylide Complex
• Estimation of the Surface Magnetic Structure of Materials by Scanning Electron Microscopy
• Observation Technique of Surface Magnetic Structure Using Type-I Magnetic Contrast in the Scanning Electron Microscope
• Stereoselective Alkylation of Terminal Sulphide in trans-{Mo(S)_2(syn-Me_8[16]aneS_4)} by Alky Halides. Preparation and Crystal Structure of trans-{Mo(SR)(S)(syn-Me8[16]aneS_4)}^+(R=Me, PhCH_2) Containing Three Distinctive Types of Sulfur Donors
• Phase Transitions in the Quinol Clathrate Compounds. I. : The Quinol Hydrogen Cyanide Clathrate Compound
• A Phase Transition in the Quinol Hydrogen Cyanide Clathrate Compound
• A Phase Transition and Dielectric Absorption in the Quinol Methanol Clathrate Compound
• Magnetic and Thermal Properties of Crystals Including Isolated Clusters. : I. Heat Capacity and Infrared Spectrum of [Cr_3O(CH_3COO)_6(H_2O)_3]Cl・6H_2O Crystal between 1.5 and 280 K
• Nuclear Magnetic Resonance Experiment on Solid Hexamethyldisilane
• Heat Capacities and Volume Thermal Expansion of NaNO_2 Crystal
• Magnetic Heat Capacity Due to Cooperative Low-Spin^1A_1⇌High-Spin ^5T_2 Transition in Fe(phen)_2(NCS)_2 Crystal
• Heat Capacity of [Cr_4(OH)_6(en)_6](SO_4)_3・10H_2O from 1.4 to 200 K and Spin Interaction
• Heat Capacity of CoCl_2・2H_2O between 7 and 120°K and its Anomaly Associated with Magnetic Transition
• An Anomaly in the Heat Capacity of CoCl_2 ・ 2H_2O at 17.20°K Associated with Antiferromagnetic Ordering
• Theoretical Evaluation of Compositional Contrast of Scanning Electron Microscope Images
• Theoretical Evaluation of a Topographic Contrast of Scanning Electron Microscope Images : Inspection and Testing
• Theoretical Evaluation of a Topographic Contrast of Scanning Electron Microscope Images
• A Simulation of Electron Scattering in Metals : Inspection and Testing
• A Simulation of the Topographic Contrast in the SEM
• A Simulation of Electron Scattering in Metals
• Analysis of Charging Effect During Observation of Trench Structures by Seanrting Electron Microscope
• Simulation of Scanning Electron Microscope Image for Trench Structures
• Thermal Properties of Alkali Halide Crystals with the CsCl-Type Structure. : II. Analysis of Experimental Results for CsBr and CsI
• A Calorimetric Study of Heavy Meromyosin ATPase
• Calorimetric Study of Glassy State. IX. Thermodynamic Properties of Stannous Chloride Dihydrate and Dideuterate Crystals : Appendix: High Temperature Entropy Calculation
• Energy of Hydrogen Bond in Tetragonal Pentaerythritol
• Heats of Transition of Hexachloroethane
• Syntheses and Infrared Absorption Spectra of Deuterated Polyvinyl Alcohols (Remark: Graphics omitted.)
• The Phase Transition of Crystalline Potassium Thiocyanate, KSCN. I. Thermal and Infrared Studies
• On the Orientational Order-Disorder Transition in Crystalline Aniline Hydrobromide
• Construction of an adiabatic calorimeter workable under constant high-pressure.
• Physico-chemical Studies of the Reversible and Irreversible Phase Transitions in Potassium Ferrocyanide Trihydrate and Its Deuterate Analogue
• Thermodynamic study of NH4Br and ND4Br crystals under constant high-pressures.
• Metal-assisted terpenoid synthesis. V. The catalytic trimerization of isoprene to trans-.BETA.-farnesene and its synthetic applications for terpenoids.
• UV photoelectron spectroscopic investigation and the DV-X.ALPHA. MO calculation of tetrakis(2-methyl-2-propanethiolato)molybdenum(IV).
• Construction of an adiabatic high-pressure calorimeter using helium gas for pressurization.
• Mechanism of the ferroelectric phase transition in K4[Fe(CN)6] 3H2O and K4[Fe(CN)6] 3D2O.
• Calorimetric study of the glassy state. XV. Thermodynamic study of pinacol hexahydrate and pinacol-d2 hexadeuterate.
• Long-lived triplet radical ion pair state of porphyrin-methylviologen combined systems as revealed by a large magnetic field effect on its lifetime.
• Phase Transition and Glass Transitions in Isocyanocyclohexane Studied by a Polaro-Calorimeter.
• Magnetic and Thermal Properties of Crystals Including Isolated Clusters. II. Heat Capacity of Co3(C5H5)3S2 from 15 to 270 K and Mechanism of Phase Transition
• Glassy Liquid Crystal of the Nematic Phase of N-(o-Hydroxy-p-methoxybenzylidene)-p-butylaniline
• Phase transition of SnCl2(H2O)x(D2O)2-x as studied by high resolution heat capacity measurement.
• Heat Capacity of Nematogenic N-p-Ethoxybenzylidene-p′-butylaniline between 14 and 375 K
• Calorimetric and Magnetic Studies of Crystalline and Glassy Bis[N-(3-methoxysalicylidene)isopropylamine]nickel(II)
• The Heat Capacity and the Phase Transition of the [(C6H5)3PCH3]+ (TCNQ)2− Crystal
• New Finding of Glassy Liquid Crystal – a Non-equilibrium State of Cholesteryl Hydrogen Phthalate
• Construction of a 3He calorimeter and heat capacity measurement of the 1965 calorimetry conference copper standard between 0.4 and 20K.
• Thermodynamic properties and phase transitions of methyltriphenylphosphonium and methyltriphenylarsonium bis(7,7,8,8-tetracyanoquinodimethanide)s and their solid solutions.
• Heat capacity of potassium p-chloranil anion radical salt between 13 and 330 K.
• Calorimetric Study of the Glassy State. VI. Phase Changes in Crystalline and Glassy-Crystalline 2,3-Dimethylbutane
• Thermochemical studies on double- and triple-layered [2.2]paracyclophanes. Estimation of molecular strain energies.
• Microscopic and dielectric studies of CH3NH3I crystal.
• Isocyanide-phosphine Complexes of Cobalt(I)
• The Glassy Crystalline State —A Non-Equilibrium State of Plastic Crystals
• Oxidative addition of .ALPHA.-bromo esters to tetrakis(isocyanide) rhodium(I) complexes. Evidence for a chain mechanism.
• Semiempirical molecular orbital considerations of the electronic structures of transition metal complexes. II. Acetylene- and azo-nickel complexes.
• An Adiabatic Calorimeter for High-resolution Heat Capacity Measurements in the Temperature Range from 12 to 300 K
• Calorimetric Study of the Glassy State. VIII. Heat Capacity and Relaxational Phenomena of Isopropylbenzene
• Some aspects on the mechanism of palladium-complex-catalyzed decomposition of and cyclopropanation with ethyl diazoacetate.

もっと見る 閉じる

スポンサーリンク