Mixed-ligand complex formation by Cu(II) with imidazole and dipeptides

Nair, M. Sivasankaran ; Santappa, M. ; Natarajan, P. (1980) Mixed-ligand complex formation by Cu(II) with imidazole and dipeptides Inorganica Chimica Acta, 41 . pp. 7-10. ISSN 0020-1693

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00201...

Related URL: http://dx.doi.org/10.1016/S0020-1693(00)88423-6


The species distribution and stability constants were evaluated for six mixed imidazole (A)-dipeptide (B) complexes of Cu(II) in aqueous perchlorate medium at I = 0.15 M (NaClO4) and 37 °C from pH titration data. The dipeptides used are glycylglycine, glycyl-L-alanine, L-alanylglycine, glycyl-L-leucine, L-leucylglycine and glycinamide. In addition to the binary complex species CuA, CuA2, CuA3, CuA4, CuB, CuBH-1, CuB2H-1, three mixed complexes CuA2B, CuA2BH-1 and CuABH-1 were detected in each system. However in the glycinamide secondary ligand (B) system, the mixed species CuAB formed instead of CuABH-1. The stability order found for these complexes is discussed in terms of the steric effects due to side chain substituents in the dipeptide (B) ligands. The results suggest that mixed-coordination enhances the stability of the complexes. The amide deprotonated dipeptides (B) appear to be tridentate in the CuA2BH-1 and CuABH-1 complexes.

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