Electrochemical synthesis of manganese(II)-Schiff base complexes and theirbehaviour towards H2O, H2O2 and SO2

Manganese(II) complexes with ONNO tetradentate Schiff bases have been prepa red by electrochemical synthesis and characterised by analytical and spectr oscopic techniques, magnetism and by studying their redox reversibility cha racter by cyclic and normal pulse voltammetry. The ability of these systems to catalyse the decomposition of water, to yield dioxygen, and their catal ase-like activity was checked. Reaction of the complexes with sulfur dioxid e was studied in the solid state and in toluene slurries at room temperatur e. The adducts formed underwent thermogravimetric desorption analyses that highlights the SO2-irreversible linkage present in all complexes.