Calorimetric Study of MMX Chain Complexes Having Alkyl Groups, Ni2(EtCS2)4I and Ni2(n-PrCS2)4I

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概要

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• Heat capacities of halogen-bridged one-dimensional binuclear metal complexes (so-called MMX chain) having alkyl groups, Ni2(RCS2)4I ($\text{R} = \text{Et}$ and n-Pr), were measured by adiabatic and relaxation calorimetry. For each complex, a small broad thermal anomaly due to a spin-Peierls transition was observed around 40 K. For Ni2(n-PrCS2)4I, a first-order phase transition was observed at 205.6 K. The enthalpy and entropy of transition were estimated to be about 4.05 kJ mol-1 and 19.7 J K-1 mol-1, respectively. The magnitude of thermal anomaly shows that the effect of molecular dynamics of ligand on the electronic state in one-dimensional chain is small for Ni complexes having localized electrons in comparison with Pt complexes.

• 2009-09-15

著者

• Saito Kazuya

  Department Of Aeronautics And Astronautics Graduate School Kyoto University

• Toriumi Koshiro

  Department Of Material Science Himeji Institute Of Technology

• Mitsumi Minoru

  Department Of Chemistry Faculty Of Science Kyushu University

• Yoshida Yuji

  Department Of Applied Chemistry Graduate School Of Engineering Osaka City University

• Yamamura Yasuhisa

  Department Of Chemistry Faculty Of Pure And Applied Sciences University Of Tsukuba

• Ikeuchi Satoaki

  Research Center for Molecular Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043

• Mitsumi Minoru

  Department of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297

• Yamamura Yasuhisa

  Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571

• Toriumi Koshiro

  Department of Applied Molecular Science, Institute for Molecular Science

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