Preparation and Isomerization of Isomers of the l- or d-Aspartato(l-histidinato)cobalt(III) Complex
- 1 January 1979
- journal article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 52 (1) , 61-64
- https://doi.org/10.1246/bcsj.52.61
Abstract
The six isomers of the [Co(l- or d-asp)(l-his)] complex (asp=aspartate ion and his=histidinate ion) have been prepared and the isomerization studied in the absence of any catalyst. The equilibrium mole fractions of these isomers in water has been found for l-transO5cisN5, l-cisO5transN5, l-fac, to be 0.53, 0.06, and 0.41, respectively, those for d-cisObcisN5, d-transO5transN5, and d-fac to be 0.48, 0.01, and 0.51 respectively. The indication is that the relative positions of the six coordinated atoms around a cobalt atom cause these unequal isomer concentration ratios. The isomerisms are dealt with by means of a network of first order reversible reactions and the absolute values of the rate constants at 80 °C have been determined.This publication has 4 references indexed in Scilit:
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