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Cooperativity of dynamics of 18-crown-6 molecule forming one-dimensional chain in Cs2(18-crown-6)3[Ni(dmit)2]2.
- Source :
-
The Journal of chemical physics [J Chem Phys] 2005 Jul 22; Vol. 123 (4), pp. 044514. - Publication Year :
- 2005
-
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.
Details
- Language :
- English
- ISSN :
- 0021-9606
- Volume :
- 123
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- The Journal of chemical physics
- Publication Type :
- Academic Journal
- Accession number :
- 16095376
- Full Text :
- https://doi.org/10.1063/1.1979481