Taqui Khan, M. M. ; Shukla, R. S. (1991) Kinetic and spectroscopic study of the formation of an intermediate ruthenium(III) ascorbate complex in the oxidation of L-ascorbic acid Polyhedron, 10 (23-24). pp. 2711-2715. ISSN 0277-5387
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/S0277-5387(00)86171-9
Abstract
The formation of an intermediate ruthenium(III) ascorbate complex (1) by the interaction of L-ascorbic acid and dichlorotetraaquoruthenium(III) is reported in the temperature range 25-40°C. The kinetics and mechanism of the formation of 1 were studied as a function of [RuIIICl2(H2O)4]+, [ascorbic acid], pH, ionic strength and temperature. The rate of formation of 1 was found to be first order in [RuIIICl2(H2O)4]+ and [ascorbic acid]. The rate has an inverse dependence on hydrogen ion concentration. Ionic strength dependence indicated the formation of 1 by monoanionic and cationic species in solution. Decomposition of 1 takes place slowly and gives the products dehydroascorbic acid and [RuIICl2(H2O)4]. A detailed discussion of the kinetic data and a comparison of rate and equilibrium constants are presented with activation and thermodynamic parameters.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 57831 |
| Deposited On: | 30 Aug 2011 10:30 |
| Last Modified: | 30 Aug 2011 10:30 |
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