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Studies on Cobalt(II), Nickel(II), Copper(II) and Zinc(II) Complexes Involving a Bidentate Schiff Base Ligand

Sivasankaran Nair M., Joseyphus R. S., Dhanaraj C. J.

Polish Journal of Chemistry

2009

Vol. 83, nr 9

1529-1535

Co(II), Ni(II), Cu(II) and Zn(II) complexes of Schiff base, derived by the condensation of indole-3-carboxaldehyde and beta-alanine, were synthesized and characterized by elemental analysis, conductance measurements, IR, electronic spectra, magnetic measurements and powder XRD. The analytical data show the composition of the metal complex to be ML2, where L is the Schiff base ligand. The conductance data indicate that all the complexes are non-electrolytes. IR results demonstrate the bidentate binding of the Schiff base ligand in volving azomethine nitrogen and carboxylato oxygen atom. The electronic spectral measurements indicate that Co(II) and Ni(II) complexes have pseudo tetrahedral geometry, while Cu(II) complex is square planar. The magnetic measurements show paramagnetic behaviour for Co(II), Ni(II) and Cu(II) complexes. The powder XRD studies show that Ni(II) and Zn(II) complexes are crystalline, while the Co(II) and Cu(II) complexes are amorphous. The crystallite size of the Zn(II) complex was found to be in the nanocrystalline regime. Antimicrobial studies indicate that the metal complexes are found to be more active than the ligand. Among the metal complexes, the Co(II) and Cu(II) complexes were more active compared to that Ni(II) and Zn(II) complexes.

Synthesis, Structural Characterization, Redox and Antimicrobial Studies of Schiff Base Copper(II), Nickel(II), Cobalt(II), Manganese(ii), Zinc(II) and Oxovanadium(ii) Complexes derived from benzil and 2-Aminobenzyl Alcohol

Raman N., Kulandaisamy A., Jeyasubramanian K.

Polish Journal of Chemistry

2002

Vol. 76 / nr 8

1085-1094

Neutral complexes of Cu(II), Ni(II), Co(II), Mn(II), VO(II) and Zn(II) have been synthesized from the Schiff base derived from benzil and 2-aminobenzyl alcohol. The structural features have been arrived from their microanalytical, IR, UV-Vis, 1H NMR, Mass and ESR spectral data. All of the complexes exhibit square-planar geometry except the Mn(II) and VO(II) complexes. The Mn(II) chelate shows an octahedral environment and the VO(II) chelate exists in a square-pyramidal geometry. The monomeric and non-electrolytic nature of the complexes is evidenced by their magnetic susceptibility and low conductance data. The cyclic voltammogram of copper complex in acetonitrile solution shows two quasi reversible peaks for the Cu(II)/Cu(III) and Cu(II)/Cu(I) couples. The X-band ESR spectra of the Cu(II) and VO(II) complexes in DMSO at 300 and 77 K were recorded and their salient features are reported. The biological activity of the metal chelates against the bacteria Staphylococcus aureus, Bacillus subtilis, Klebsiella pneumoniae, Salmonella typhi, Pseudomonas aeruginosa and Shigella flexneri are also reported. Most of the complexes have higher activity than that of the free Schiff base and the control.