OXIDATION OF KINETIN BY Cu(III) COMPLEX IN ALKALI MEDIA: A KINETIC AND MECHANISTIC APPROACH

The kinetics of oxidation of kinetin (KNT) by diperiodatocuprate(III) (DPC) in alkaline medium at a constant ionic strength of 0.02 mol dm(-3) was studied spectrophtometrically. The reaction between DPC and kinetin in alkaline medium exhibits 1:3 stoichiometry (KNT:DPC). Intervention of free radicals was observed in the reaction. Based on the observed orders and experimental evidences, a mechanism involving the monoperiodatocuprate (III) (MPC) as the reactive oxidant species has been proposed. The products were identified by spot test and characterised by spectral studies. The reaction constants involved in the different steps of mechanism were calculated. The activation parameters with respect to slow step of the mechanism were computed and discussed. The thermodynamic quantities were also determined for different equilibrium steps.