Abstract

UNCATALYSED OXIDATION OF ALLOPURINOL BY DIPERIODATOARGENTATE(III) COMPLEX IN AQUEOUS ALKALINE MEDIUM

*M. R. Kembhavi and S. D. Lamani

Abstract

The oxidation of allopurinol (ALO) by diperiodatoargentate(III) (DPA) has been investigated spectrophotometrically the absence in alkaline medium at a constant ionic strength of 0.10mol dm-3and Ag(I). The stoichiometry is i.e., [ALO]:[DPA] = 1:1. In the uncatalysed the order with respect to DPA concentration was unity while the order with respect to ALO concentration was < 1 over the concentration range studied. The rate increased with an increase in OH- concentration and decreased rate with an increase in IO4 - ion concentration. The mechanisms proposed and derived rate laws are consistent with the observed experimental kinetics. Kinetic experiments suggest that Ag(H2IO6) (H2O)2 is the reactive species of oxidant. The activation parameters were evaluated with respect to slow step of the mechanism.

Keywords: Allopurinol (ALO), Diperiodatoargentate(III), Oxidation, Kinetics.