Template Synthesis, Spectroscopic Characterization and Antimicrobial Studies of Oxovanadium(IV) Tetraazamacrocyclic Complexes Derived from 1, 8-Diaminonaphthalene and Substituted β-Diketones

A new series of oxovanadium (IV) tetraazamacrocyclic complexes type [VO(mac)]SO4, have been synthesized via in situ reaction 1,8-diaminonaphthalene and substituted β-diketones (1-phenyl-3-(phenyl/4-chlorophenyl/4-hydroxyphenyl/4- methoxyphenyl/4-nitrophenyl)-diketone) the presence oxovanadium(IV) sulphate methanol. Attempts to synthesize corresponding metal free macrocyclic ligands did not prove successful. Complexes were characterized on basis elemental analyses, conductance measurements, magnetic properties spectral (electronic, IR, EPR) data. The moments lie range 1.70-1.78BM suitable for with one unpaired electron paramagnetic nature. infrared spectra indicates that coordinate through four aza nitrogen atoms vanadium(IV). fluid solution EPR show an eight-line pattern typical a mononuclear VO(IV) complexes. studies support square pyramidal geometry tested their antibacterial activity against bacteria Bacillus subtilis, Staphylococcus aureus, Escherichia coli antifungal fungi Aspergillus niger Candida albicans. moderate good as compared standard antibiotic tetracycline drug fluconazole.