Synthesis and characterization of Mo(VI) complexes derived from ONO donor acylhydrazones

Four new dioxomolybdenum(VI) complexes were prepared using different acylhydrazones. Hydrazones used for complexation were derived from 2-hydroxy-4-methoxybenzaldehyde, 2-hydroxy-4-methoxyacetophenone, benzhydrazide and nicotinoyl hydrazide. The complexes were characterized by various spectroscopic techniques, thermal and elemental analyses. The 1H NMR and IR spectral data indicate tridentate nature of the ligands through enolization. IR spectra provide information about the dimeric nature of the complexes. The thermal analyses of the complexes showed the presence of lattice water in some of the complexes.

Four dimeric dioxomolybdenum(VI) complexes derived from different acylhydrazones are reported and their spectroscopic characterizations described. The thermal analyses of the complexes showed the presence of lattice water in some complexes.Figure optionsDownload as PowerPoint slideResearch highlights
► Four new dioxomolybdenum(VI) complexes were prepared using different acylhydrazones.
► In all the complexes acylhydrazones act as tridentate dianionic ONO donor ligands towards MoO22+centre.
► Spectral studies help to confirm that all complexes are dimeric in nature and in all cases ligands are in tridentate dideprotonated forms.
► Conductivity values showed the non-electrolytic nature of complexes, and magnetic studies revealed diamagnetic nature showing the existence of +6 oxidation state of Mo in these complexes.
► Thermal analyses of the complexes showed the presence of lattice water in some of the complexes.