Kinetic and spectroscopic study of the formation of an intermediate ruthenium(III) ascorbate complex in the oxidation of L-ascorbic acid

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

Full text not available from this repository.

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

Repository Staff Only: item control page