Catalytic decomposition of hydrogen peroxide in the presence ofN, N′-bis(salicylidene)-o-phenylenediamineiron(III) sorbed on to Dowex-50W resin

The tetradentate Schiff-base ligandN, N′-bis(salicylidene)-o-phenylenediamine (salph) is very strongly sorbed by cation exchange materials with transition metal counter ions, forming stable complexes. The kinetics of catalytic decomposition of H2O2 in the presence of (salph)-FeIII sorbed on Dowex-50W resin has been studied in aqueous medium. The reaction is first order with respect to [H2O2]. The rate constant, k (per g of dry resin) decreased with increasing degree of resin cross-linkage due to a salting out effect. The activation parameters were calculated and a reaction mechanism is proposed.