Synthesis, Characterization and Antibacterial Studies of Oxovanadium Complexes of Tetradentate Schiff Base Derived from 4-Aminoantipyrine, o-Phenylene diamine and Vanillin/Furfural

N. Gayathri and M.S. Suresh*

Department of Chemistry, Government Arts College, Udhagamandalam-643 002, India

*Corresponding author: E-mail:;


Two new vanadyl complexes were synthesized from tetradentate Schiff bases having four nitrogens act as donor atoms using 4-aminoantipyrine, o-phenylenediamine and vanillin/furfural. These complexes were characterized by elemental analysis, FTIR, UV-visible, ESR spectroscopic methods, magnetic susceptibility and molar conductivity measurements and thermal analysis. These complexes have the general molecular formula [VOL]SO4, where L = tetradentate Schiff base. The higher molar conductivity values support the 1:1 electrolytic nature of the complexes. The infrared spectra reveals the involvement of azomethine nitrogens (-C=N-) coordinated to the metal resulting in MN4 chromophores. The electronic spectra suggested that they were square pyramidal in shape, and the complexes are paramagnetic in nature. The thermal decomposition of both the complexes yield V2O5 as the stable residue in static air atmosphere and decomposition is seen taking place in two stages. The eight line hyperfine splitting in ESR spectra indicates that a single vanadium is present in the molecule. The antibacterial properties against E. coli, S. aureus, Serratia sp, P. aeruginosa, B. cereus were performed with the Schiff base and the metal complexes. The MIC values indicates that the complexes exhibit greater antibacterial activity than the ligands.


Schiff base, 4-Aminoantipyrine, Vanillin, Furfural, o-Phenylenediamine, Vanadyl complexes, Antibacterial studies.

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