Oxoperoxomolybdenum(VI) complexes of catalytic and biomedical relevance: Synthesis, characterization, antibacterial activity and 3D-molecular modeling of some oxoperoxomolybdenum(VI) chelates in mixed (O,O) coordination environment involving maltol and β

A new series of four mixed-ligand complexes of oxoperoxomolybdenum(VI) of the general composition [MoO(O2)(ma)(L)]·H2O, where maH = 3-hydroxy-2-methyl-4-pyrone and LH = o-acetoacetanisidide (o-aansH), o-acetoacetotoluidide (o-aatdH), acetylacetone (acacH) or methylactoacetate (macacH), has been synthesized by the interaction of [MoO(O2)]2+ (obtained in situ during the interaction of MoO3 and 30% H2O2 on continuous stirring at 50 °C for 24 h) and the said ligands in aqueous-ethanol medium. The complexes so obtained have been characterized by elemental analyses, molybdenum determination, molar conductance, decomposition temperature and magnetic measurements, thermogravimetric studies, 1H NMR, IR, mass and electronic spectral studies. Antibacterial studies of one of the ligands maltol and the two representative metal complexes were also carried out and it has been observed that the complexes are more potent bactericides than the ligand. The 3D-molecular modeling and analysis for bond lengths and bond angles have also been carried out for one of the representative compound (1) to substantiate the proposed structure. Pseudopentagonal bipyramidal structures have been proposed for these complexes.