Oxovanadium (IV & V) Complexes of Some Tridentate Schiff Bases

Department of Chemistry, University of Kalyani, Kalyani, West Bengal Manuscript received 10 February 1972; accepted 30 January 1973 Preparation and properties of some oxovanadium-(iv & v) complexes of dibasic tridentate Schiff bases derived by the condensation of 3-aldehydosalicylic acid with glycine (=ASAG-H3) and anthranilic acid (= ASA-H3) are described. The structures of the complexes have been discussed on the basis of elemental analyses, magnetic moments, infrared and electronic spectral data. The compounds [VO(ASAG-H)(H2O)] and [VO(ASAA-H)(H2O)] are found to be paramagne­tic (\(µeff\) = 1.78 and 1.81 BM. respectivel) and a square-pyramidal structure is assigned to them. The electronic spectra of these complexes are interpreted using recently proposed ordering of vanadium d orbitals by Vanquickenborne and McGlynn : xy < xz, yz < x2— y2 < z2. The other two compounds, [VO(ASAA-H)(OH)(H2O)] and [VO(ASAG-H)(OH)]2 are diamagnetic [and con­sidered to be complexes of oxovanadium (V) species. These two compounds can easily be con­verted to the original oxovanadium (IV) complexes by grinding with sodium bisulphite in a little water. One broad but well defined absorption band is observed in the 10,000-25,000 cm-1 region, which is attributed to ligand—metal charge transfer transition