Syntheses and Characterization of Some Tetradentate Schiff‐Base Complexes and Their Heteroleptic Analogues

VO(IV), Ni(II) and Cu(II) complexes of the asymmetric Schiff base ((HOC 6H3(OCH 3)C(C 6H5):N(CH 2CH 2)N:C(CH 3)CH:C(C 6H5)OH)), and their heteroleptic analogues with triphenyl phosphine and 2,2'-bipyridine have been synthesized and characterized by elemental analyses, conductance, magnetic, infrared and electronic spectral measurements. The ligand is tetradentate coordinating via the imine N and enolic O atoms. The Ni(II) and Cu(II) complexes adopt a four coordinate square planar geometry, the VO(IV) complex is five coordinate square-pyramidal and the heteroleptic complexes are 6-coordinate, octahedral. The assignment of geometry is collaborated by magnetic moments and electronic spectra measurements. The compounds are non-electrolyte in nitromethane and are magnetically dilute.