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Published Online: 03 August 2005
Accepted: June 2005

Cooperativity of dynamics of 18-crown-6 molecule forming one-dimensional chain in Cs2(18-crown-6)3[Ni(dmit)2]2

J. Chem. Phys. 123, 044514 (2005); https://doi.org/10.1063/1.1979481
Satoaki Ikeuchi and Yuji Miyazaki
  • Research Center for Molecular Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
    • Sadamu Takeda
  • Department of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
    • Tomoyuki Akutagawa, Sadafumi Nishihara, and Takayoshi Nakamura
  • Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0810, Japan
    • Kazuya Saitoa)
  • Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
    • more...View Affiliations
    ABSTRACT
    Heat capacity of Cs2(18-crown-6)3[Ni(dmit)2]2 was measured by adiabatic calorimetry. A broad thermal anomaly was observed around 225K. The entropy gain (about 52JK−1mol−1) is much larger than that expected for twofold disordering of 18-crown-6 assumed in the previous structure analysis. The shape of thermal anomaly was qualitatively explained by a linear Ising model developed for cooperative disordering in polymers. The 18-crown-6 molecules forming a one-dimensional chain in the crystal are orientationally disordered with moderate cooperativity.

    ACKNOWLEDGMENT

    One of the authors (S.I.) expresses his special thanks to the center of excellence (21COE) program “Creation of Integrated EcoChemistry of Osaka University” for supports. Contribution No. 94 from the Research Center for Molecular Thermodynamics.

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    1. © 2005 American Institute of Physics.

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