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Manganese(II) metal ion and sulfathiazole (Hstz) react with pyrrolidine (pyrro), piperidine (pipe) and ethylenediamine (en) to form the following mixed ligand complexes : [Mn(stz) 2 (pyrro) 2 ], [Mn(stz) 2 (pipe) 2 ] and [Mn(stz) 2 (en) 2 ] which were characterized by physicochemical and spectroscopic methods. Their spectra indicated that the sulfathiazole is probably acting as a monoanionic unidentate chelating agent. The superoxide dismutase mimetic activity of the complexes was investigated using the indirect xanthine-xanthine oxidase-nitroblue tetrazolium method and compared to that of the native enzyme.e-mail: juananacona@hotmail.com INTRODUCTION Superoxide dismutase (SOD) is an enzyme that has attracted the interest of researchers with different approaches and goals. It catalyses the dismutation of the superoxide radical very efciently through a redox reaction of its copper centre 1,2 . The mechanism believed to be operating in the metalloproteins involves one-electron reduction of a metal ion by superoxide followed by re-oxidation of the reduced metal ion by a second superoxide anion

SYNTHESIS, CHARACTERIZATION AND SUPEROXIDE DISMUTASE ACTWITY OF THE MANGANESE(II) MIXED LIGAND COMPLEXES CONTAINING SULFATHIAZOLE