A Kinetic Study of Oxidation of New [Co(L)2(H2O)2] Complex by N-bromosuccinimide (NBS)

Abstract

The kinetics of the oxidation of the [Co(L)2(H2O)2] complex by N-bromosuccinimide (NBS) in aqueous media (L = bidentate ligand mono deprotonated anion derived from methyl salicylaldehyde and sulfacetamide) were investigated over a pH range of 4.2–5.4, temperatures ranging from 25°C to 40°C, and an ionic strength of 0.1 mol/l–0.4 mol/l for both NBS and complex concentrations. The reaction rate over the studied pH ranges was predicted to be first order NBS and complex dependent and to rise with decreasing [H+]. It was compatible with the experimental rate law to say that a process in which the complex’s dehydrogenated form is greater reactivity compared to its conjugate acid. Acrylonitrile polymerisation was tested for its abundance of free radicals in the reaction admixture. It was supposed that transfer of electrons and formation of initial cobalt(III) products, which were eventually were tardily transformed into the final cobalt(III) products, occurred by an inner-sphere mechanism.