Calorimetric, infrared and ESR studies of the plastically crystalline state of organic compounds

Ganguly, Somnath ; Fernandes, J. R. ; Rao, C. N. R. (1981) Calorimetric, infrared and ESR studies of the plastically crystalline state of organic compounds Advances in Molecular Relaxation and Interaction Processes, 20 (3). pp. 149-163. ISSN 0378-4487

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0378-4487(81)80011-8

Abstract

Enthalpy changes of the crystal-plastic and plastic-liquid transitions are related to the temperature range of stability of the plastic phase. Thermodynamics of the plastic state of binary mixtures have been examined. Infrared correlation times, τc, and activation energies have been measured for a few molecules in the plastic state. Molecular tumbling times, τt, have also been measured employing ESR spectra of a spin-probe. Plots of log τct) versus 1/T are continuous through the plastic-liquid transition. Activation energies for molecular motion seem to vary in the same direction as the ΔH of the plastic-crystal transition. Infrared correlation times of solute molecules in binary solutions in the plastic and the liquid states show interesting variations with solute concentration.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:42432
Deposited On:02 Jun 2011 13:54
Last Modified:02 Jun 2011 13:54

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