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

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

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...

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Veröffentlicht in:The Journal of chemical physics 2005-07, Vol.123 (4), p.044514-044514
Hauptverfasser: Ikeuchi, Satoaki, Miyazaki, Yuji, Takeda, Sadamu, Akutagawa, Tomoyuki, Nishihara, Sadafumi, Nakamura, Takayoshi, Saito, Kazuya
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container_issue 4
container_start_page 044514
container_title The Journal of chemical physics
container_volume 123
creator Ikeuchi, Satoaki
Miyazaki, Yuji
Takeda, Sadamu
Akutagawa, Tomoyuki
Nishihara, Sadafumi
Nakamura, Takayoshi
Saito, Kazuya
description 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.
doi_str_mv 10.1063/1.1979481
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title Cooperativity of dynamics of 18-crown-6 molecule forming one-dimensional chain in Cs2(18-crown-6)3[Ni(dmit)2]2
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