Dioxomolybdenum(VI) chelates of bioinorganic, catalytic, and medicinal relevance: Studies on some cis-dioxomolybdenum(VI) complexes involving O, N-donor 4-oximino-2-pyrazoline-5-one derivatives

A new series of five mixed-ligand complexes of dioxomolybdenum(VI) of the general composition [MoO2(L)(2)(H2O)(2)], where LH=4-acetyloxime-3-methyl-1-phenyl-2-pyrazolin-5-one (aomppH), 3-methyl-1-phenyl-4-propionyloxime-2-pyrazolin-5-one (mppopH), 4-butyryloxime-3-methyl-1-phenyl-2-pyrazolin-5-one (buomppH), 4-iso-butyryloxime-3-methyl-1-phenyl-2-pyrazolin-5-one (ibuomppH) or 4-benzoyloxime-3-methyl-1-phenyl-2-pyrazolin-5-one (bomppH) has been synthesized by the interaction of [MoO2(acac)(2)] with the said ligands in ethanol medium. The complexes so obtained were characterized by elemental analyses, molar conductance, decomposition temperature and magnetic measurements, thermogravimetric analyses, H-1 NMR, IR, mass, and electronic spectral studies. The 3D molecular modeling and analysis for bond lengths and bond angles have also been carried out for one of the representative compound, [MoO2(aomppH)(2)(H2O)(2)] (1) to substantiate the proposed structure. (C) 2011 Production and hosting by Elsevier B.V. on behalf of King Saud University.