OXOVANADIUM(IV) AND OXOVANADIUM(V) COMPLEXES WITH TRIDENTATE ONO DONOR LIGANDS

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Abstract
A series of new coordination complexes of oxovanadium(IV) and oxovanadium(V) with tridentate ONO donor ligands are synthesized and characterized. The oxovanadium(IV) complexes are of the type: (i) VOL (H2O), (ii) VOL (py)2, (iii) VOL (ophen), (iv) VOL'·XH2O and (v) VOL' (ophen) (where LH2=2-hydroxynaphthylidene-amino acid, a tridentate dibasic ligand with ONO donor atoms; py=pyridine; ophen=orthopenanthroline; L'H2=2-hydroxynaphthylidene-orthoaminophenol). The oxovanadium(V) complexes are of the type: (i) VO(OCH3)L°CH3OH and (ii) [VO(OH)L]2. The VOL (H2O), VOL (py)2, VOL (ophen) and VOL' (ophen) complexes have normal magnetic moments (μ eff =1.70–1.74 BM) at room temperature. The VOL'·XH2O complexes exhibit subnormal magnetic moments at room temperature and at lower temperatures. Electron spin resonance data of VOL'·XH2O are reported. The oxovanadium(V) complexes are diamagnetic. Electrolytic conductance measurements indicate they are nonelectrolytes. Electronic spectra, infrared spectra and molecular weight data are reported.