SYNTHETIC AND SPECTRAL STUDIES OF OXOVANADIUM-(IV) COMPLEXES WITH PYRAZOLINES AND ISOXAZOLINES

A few oxovanadium (IV) complexes of the type VOL2 [LH = -hydroxy-1-nap hthyl)-5-(4-X-phenyl)-2-isoxazoline; X = H, CI, OMe] have been prepare d and characterized. IR spectral studies indicate coordination of the ligand through phenolic oxygen and tertiary nitrogen to the metal, Ele ctronic spectral and magnetic susceptibility studies indicate the pres ence of a single unpaired electron while EPR studies confirm that the unpaired electron is present in the d(xy) orbital. EPR spectra recorde d in pyridine show that the V=O bond is weakened leading to stronger i n-plane bonds due to axial coordination of pyridine trans to the vanad yl oxygen.