Abstract

Oxovanadium(IV) complexes with tetraaza macrocyclic ligands derived by condensation of 1,2-diacetylbenzene with o-phenylenediamine

Author(s): Vijai Singh, Probin Bora and Hardeo Singh Yadav

The synthesis oxovanadium(IV) complex, [VO(L)]SO4, is achieved using in-situ method, where VO2+ ion acts as a kinetic template for the formation of ligand derived by condensation of 1,2-diacetylbenzene with ophenylenediamine in 1:2 molar ratio in aqueous ethanol medium. The parent complex, [VO(L)]SO4, after reaction with β-diketones, result macrocyclic complexes, [VO(mac)]SO4 , where mac = macrocyclic ligands derived by reactions of [VO(L)]SO4 with acetylacetone, benzoylacetone, thenoyltrifluoroacetone and dibenzoylmethane.These vanadyl complexes are characterized and their tentative structures are ascertained on the basis of elemental analyses, molar conductance, magnetic moments and spectral (electronic, infra-red and esr) data. All the vanadyl complexes are five-coordinate having tetradentate chelating ligands.These vanadyl complexes were tested for their antifungal activities against Aspergillus niger and Aspergillus flavus, which showed significant antifungal activities.

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