Issue 0, 1968

Octahedral cobalt(III) complexes of the chloropentammine type. Part XIV. Base hydrolysis of some halogenopentamminecobalt(III) and halogenopentamminechromium(III) cations in aqueous alcohols

Abstract

The second-order rate constants for the base hydrolysis of chloro- and fluoro-pentamminecobalt(III) and the corresponding chromium(III) cations in mixed solvents have been determined over a range of temperatures and the Arrhenius parameters have been calculated. The reaction media used were mixtures of methanol (or ethanol) with water in the mole ratio 1 : 4·5. The higher rates in these solvents compared with those in water are apparently compatible with both the conjugate-base and the ion-pair mechanisms of octahedral base hydrolysis. Since, for the corresponding hexammine type of cations in alkaline solutions, spectroscopic evidence points to the presence of the ion-pair, and not the conjugate-base, the kinetic results are discussed in terms of the ion-pair mechanism.

Article information

Article type
Paper

J. Chem. Soc. A, 1968, 1741-1744

Octahedral cobalt(III) complexes of the chloropentammine type. Part XIV. Base hydrolysis of some halogenopentamminecobalt(III) and halogenopentamminechromium(III) cations in aqueous alcohols

S. C. Chan and K. Y. Hui, J. Chem. Soc. A, 1968, 1741 DOI: 10.1039/J19680001741

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