Kinetics and Mechanism of 1,10-Phenanthroline Catalysed Chromium(VI) Oxidation of D-Glucose in Aqueous Micellar Media

Abstract

The kinetics and mechanism of Cr^VI oxidation of D-glucose in the presence and absence of 1,10-phenanthroline (phen) in aqueous acid media have been studied under the conditions, [sugar]_T ≥ [Cr^VI]_T at different temperatures. The monomeric species of Cr^VI has been found to be kinetically active in the absence of phen whereas in the phen-catalysed path, the Cr^VI - phen complexes have been found to be the active oxidants. Both the paths show a first order dependence on [sugar]_T and [Cr^VI]_T. The uncatalysed path shows a second order dependence on [H⁺], while the catalysed path shows a first order dependence on [H⁺]. The phen-catalysed path is first-order in [phen]_T. These observations remain unaltered in the presence of externally added surfactants. CPC inhibits both pathways while SDS catalyses the reactions.

Keywords

kinetics catalysis D-glucose chromium(VI)1,10-phenanthroline surfactants

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