Complexes of some Platinum Group Metals with Hydrazone Ligands and their Catalytic Oxidative Properties

New complexes of ruthenium(I1), ruthenium(III), osmium(III) and palladium(II) have been prepared with a neutral bidendate hydrazone ligand derived from antipyrine-4-carboxaldehyde and benzoylhydrazine. Ruthenium(III) complexes have also been synthesized from monobasic bidendate ligands prepared from benzaldehyde and benzoyl or p-substituted (Me, C1) benzoyl hydrazine. The complexes were characterized by spectroscopic techniques and investigated by cyclic voltammetry. The efficient catalytic oxidation of alcohols and 3,5-di-_butyl catechol in the presence of N-methylmorpholine-N-oxide or m-chloroperbenzoic acid as co-oxidants is reported.