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EPR and optical studies in pseudotetrahedral tetramethyl ammonium copper {II) bromide

De, Dilip Kumar (1983) EPR and optical studies in pseudotetrahedral tetramethyl ammonium copper {II) bromide. J. Chem. Phys., 79 (2). pp. 535-540.

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Abstract

EPR studies of single crystal copper tetramethyl ammonium bromide, T2CuBr4(T = (CH3~4N] in the temperature range 77-300 K indicate the largest covalency in this compound compared to similar halogenated pseudotetrahedral copper compounds. The angle cos _,r between the c axis and the ionic g 11 axis is 12' and 65' at 250 and 220 K, respectively. The change is continuous down to 200 K. The g shift between 300 and 200 K indicates an increase in the strength of the ligand field with lowering of temperature. The magnetic susceptibility ellipsoid and the g -tensor ellipsoid do not coincide in this material. Optical spectra in T2(Cu:Zn)Br4 have been assigned. The nonobservation of an EPR signal in T,(Cu:Zn)Br4 and Cs2CuBr4 indicates that ligand field properties in these pseudotetrahedral compounds are quite different from that of T2CuBr4•

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Medicine, Health and Life Sciences > School of Biological Sciences
Depositing User: Mrs Patricia Nwokealisi
Date Deposited: 24 Apr 2015 15:39
Last Modified: 12 Aug 2015 11:53
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/5109

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