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Oxovanadium(Ⅳ) complexes with salicylaldoxime, o-vanilline oxime, 2-hydroxy-4-methoxybenzaldoxime, 2-hydroxy-5-methoxybenzaldoxime and 2-hydroxy-5-nitrobenzaldoxime were synthesized. The complexes have been characterized by elemental analysis, electric conductivity measurement, infrared spectrometry, electronic spectrometry, mass spectrometry, and thermal analysis. The results of elemental analysis were well coincided with the theoretical values. The values of molar conductance of the complexes in DMF implicated that the complexes were non-electrolyte. The characteristic stretching frequency of V=O appeared strong band in the range of 980±20 cm-1. All the complexes showed two d-d transition in visible spectra and two charge transfer transitions in ultraviolet spectra. Results of mass spectrometry of VO(sal)2 and VO(van)2 indicated two peaks corresponding to vanadium containing ion(Ⅰ) of 1 : 2(metal to ligand) chelate and a fragment ion(Ⅱ) of 1 : 1 chelate due to loss of ligand radical from ion(Ⅰ). The thermal analysis showed the endothermic peak due to the thermal decomposition.
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