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Kinetics of aquation of trans-dichlorobis(ethylenediamine)chromium(III) cation

1961; Pergamon Press; Volume: 18; Linguagem: Inglês

10.1016/0022-1902(61)80391-6

1878-1225

David MacDonald, Clifford S. Garner,

Analytical Chemistry and Chromatography

The pseudo first-order rate constant for the production of ionic chloride by aquation of trans-dichlorobis(ethylenediamine)chromium(III) cation in 0·1 F HNO3 at 25·0°C was found to be (2·25±0·03) × 10−5 sec−1. The rate is independent of initial concentration of the complex over the range 1·6–11·3 mF, of pH from 0·14 to 2·9, and of ionic strength from 0·016 to 1·0. Added sulphate ion accelerates the aquation, as does light. The Arrhenius activation energy is 23·23±0·17 kcal/mole over the temperature range 15·35°C, slightly less than for the trans-cobalt(III) analogue as predicted by crystal-field theory.