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, 1H 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.