ESR studies of X-irradiated strontium mixed calcium tartrate crystals

Suryanarayanan, K and Dharmaprakash, SM and Ananda, A (2000) ESR studies of X-irradiated strontium mixed calcium tartrate crystals. In: European Polymer Journal, 61 (11). pp. 1821-1825.

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Abstract

The electron spin resonance spectra of X-ray irradiated single crystals of strontium doped calcium tartrate tetrahydrate (CST) with molecular formula Ca0.88Sr0.12C4H4O6.4H(2)O grown in gels has been investigated. Only one species of free radical but with two magnetically unequivalent sites was observed at room temperature. The free radical was found to be the result of the splitting of a C-II bond adjacent to both the hydroxyl and carboxyl groups. The a factor was found to be slightly anisotropic. Couplings with two H nuclei, believed to be the proton of the OH group attached directly to the unsaturated asymmetric carbon atom and the proton attached directly to the: other asymmetric carbon atom of the molecule were observed. The principal g-values were found to be 2.0030, 2.0017, 2.0027. The principal elements of the nuclear coupling are 7.45, 6.59, 4.28 and 8.56, 7.22, 18.71 G, respectively. The radical was found to be very stable. (C) 2000 Elsevier Science Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	European Polymer Journal
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	A.Inorganic compounds;D.Crystal structure.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	18 Aug 2010 11:09
Last Modified:	19 Sep 2010 06:14
URI:	http://eprints.iisc.ac.in/id/eprint/31414

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