Study on phenol oxidation with H_2O_2 catalyzed by Schiff base manganese complexes as mimetic peroxidase

摘要

Two new ligands, 1-hydroxy-5-[4-(2-hydroxybenzylideneamino)pheno -xy]-3-oxapentane (HL~1) and 1-methoxy-5-[4-(2-hydroxybenzylideneamino)pheno -xy]-3-oxapentane (HL~2), and their Mn(Ⅲ) complexes were synthesized and characterized. The two new Schiff base Mn(Ⅲ) complexes were used to mimic peroxidase in the oxidation of phenol by hydrogen peroxide. The effect of the mole ratio of H_2O_2 to the complex, pH and temperature on the reaction rate was investigated. The mechanism of the catalytic oxidation is discussed. A kinetic mathematic model for the oxidation of phenol catalyzed by Schiff base Mn(Ⅲ) complexes has been constructed.