450OXOVANADIUM (IV) COMPLEXES WITH 15 - MEMBERED MACROCYCLIC LIGANDS USING 1,2-DIACETYLBENZENE AS PRECURSORSynthesis oxovanadium (IV) complex, [VO(L)]SO4, is achieved under in-situ experimental conditions where ligand is derived by condensation of 1,2-diacetylbenzene with ethylenediamine in 1:2 molar ratio in aqueous ethanol medium. The parent complex, [VO(L)]SO4 has been reacted with β-diketones to form macrocyclic complexes, [VO(mac)]SO4 , where mac represent 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 data of electronic, infrared and X-band electron spin resonance spectroscopy. These vanadyl complexes were screened for their antifungal activities against Aspergillus niger and Aspergillus flavus, which showed promising antifungal activitieshardeoy@yahoo.co.inResearch612016Vanadyl ion,Macrocyclic,Diacetylbenzene,Ethylenediamine,diketonesVijai Singh,Probin Bora,Hardeo Singh YadavDepartment of Chemistry, North Eastern Regional Institute of Science and Technology, Nirjuli-791109, Itanagar, Arunachal Pradesh, India.,Department of Chemistry, North Eastern Regional Institute of Science and Technology, Nirjuli-791109, Itanagar, Arunachal Pradesh, India.,Department of Chemistry, North Eastern Regional Institute of Science and Technology, Nirjuli-791109, Itanagar, Arunachal Pradesh, India.