A kinetic approach for the homogeneous reaction between N,N′propylenebis (salicylideneiminato)manganese(III) complex and hydrogen peroxide in aqueous solution

Abstract

The kinetics of the homogeneous reaction between the [Mn III(saltm)Br] complex [saltm: N,N′-bis (salicylidene) propylenediamine] and hydrogen peroxide was studied in the pH range 5.05–7.29 in both aqueous and micellar sodium dodecyl sulphate solution. The reaction showed a first-order dependence in both the hydrogen peroxide and the complex. The rate of reaction was decreased with increasing acidity of the medium, as well as with increasing the concentration of the surfactant. The second-order rate constants and the activation parameters were evaluated. A mechanism involving manganese-(IV) and a peroxo-intermediate is proposed with the subsequent release of OH radicals as the rate-determining step.