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1 Polish Journal of Chemistry

1 2008

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Synthesis, Spectral, Redox and Biological Screening Studies of Schiff Base Copper(II), Nickel(II), Cobalt(II), Oxovanadium(II) and Zinc(II) Complexes Derived from Curcumin and 4-Aminoantipyrine

100%

Kulandaisamy A. , Thomas M.

2008

tom Vol. 82, nr 3

469-480

Neutral complexes of Cu(II), Ni(II), Co(II), VO(II) and Zn(II) have been synthesized from the new Schiff base de rived from curcumin and 4-aminoantipyrine. The structural features of the com plexes have been de ter mined from their microanalytical, magnetic susceptibility, molar conductance, IR, UV-Vis, 1H-NMR, mass and ESR spectral data. All the complexes exhibit square planar geometry while vanadyl complex exists in a square pyramidal geome try. Their magnetic susceptibility measurements and low conductance data provideevidence for the monomeric and non-electrolytic nature of the complexes respectively. Mass, 1H-NMR spectra of the Schiff base and its com plexes suggest that the general formula of the complexes is [ML2]. The redox behaviour of the Cu(II), Ni(II) and VO(II) complexes in MeCN at 300 K was studied by using cyclic voltammetry. The X-band ESR spectra of copper and vanadyl complexes in DMSO solution at 300 K and 77 K were recorded and their salient features were discussed. The antimicrobial activity of the ligand and its complexes against the bacteria Staphylococus aureus, Bacillus subtilis, Klebsiella pneumoniae, Salm nella typhi, Pseud monas aeruginosa and Shigella flexneri are also reported.