Schiff base complexes of some metal ions with vanillin and amino acids

Department of Chemistry, Manonmaniam Sundaranar University, Abishekapatti, Tirunelveli-627 012, Tamilnadu, India E-mail: msnairchem@rediffmail.com Manuscript received 17 April 2007, accepted 4 June 2007 Equilibrium studies on the Schiff base complex systems, viz. CoII, NiII, CuII and ZnII-vanillin(van)(A)-L-valinc(val )/L-glutamine(gln)/ L-glutamic acid(glu)/L.-histidine(his)(B) demonstrate the presence of MAB, MA2B or MA2B2 complexes. The stability constant values in the MII-von-val/gln/lglu systems indicate that the Schiff base ligand (AB) is tridentate in its M(AB) complexes, while it is tctradentate in the MII-van-his systems. The results show that the MA2B and MA2B2 complexes can best be represented respectively as M(AD)A and M(AB)z-

Keywords

amino acids, vanilin, metal ions, Schiff base complexes

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