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

Ganguly, Somnath and Fernandes, JR and Rao, CNR (1981) Calorimetric, infrared and ESR studies of the plastically crystalline state of organic compounds. In: Advances in Molecular Relaxation and Interaction Processes, 20 (3). pp. 149-163.

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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 τc(τt) 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:	Journal Article
Publication:	Advances in Molecular Relaxation and Interaction Processes
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	01 Jul 2009 11:36
Last Modified:	19 Sep 2010 05:34
URI:	http://eprints.iisc.ac.in/id/eprint/20781

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