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

Satoaki Ikeuchi, Yuji Miyazaki, Sadamu Takeda, Tomoyuki Akutagawa, Sadafumi Nishihara, Takayoshi Nakamura, Kazuya Saito

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13 Citations (Scopus)

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 225 K. The entropy gain (about 52 J K-1 mol-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.

Original languageEnglish
Article number044514
JournalJournal of Chemical Physics
Volume123
Issue number4
DOIs
Publication statusPublished - 2005 Aug 29
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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