Synthesis and Characterization of Molybdenum and Tungsten Complexes of N-Nicotinoyl-N'-2-ThiophenetMocarbohydrazide

摘要

Molybdenum and tungsten complexes of the type M2O4L2(H2O)2, where M = Mo(V), W(V), LH = N-nicotinoyl-N'-2-thiophenethiocarbohydrazide (H2NTTH), have been synthesized and characterized by using elemental analysis, magnetic susceptibility measurements, infrared spectra, ~1HNMR, ~(13)CNMR,ESR.and X-ray spectroscopic studies. Molar conductance measurements in DMF show non-ionic behaviour of all the complexes. Magnetic susceptibility measurements indicate diamagnetic nature of the complexes. Although the complexes are ESR inactive, +V oxidation state of metal ions in octahedral geometry has been suggested on the basis of electronic spectral studies. IR and electronic spectral studies indicate dinuclear - type of complexes with M2O4~(2+) moiety. IR spectral data suggest monoanionic bidentate mode of bonding for the ligand. The ~1H NMR and ~(13)C NMR spectra are foimd to be in good agreement with the proposed stoichiometry. X-ray powder diffraction of the complexes exhibit amorphous nature of the complexes.