Kállay, Csilla and Cattari, Manuela and Sanna, Daniele and Várnagy, Katalin and Süli-Vargha, Helga and Csámpai, Antal and Sóvágó, Imre and Micera, Giovanni (2004) Copper(II) complexes of amino acid derivatives of the bis(imidazol-2-yl)methyl residue. New Journal of Chemistry, Vol. 28 (6), p. 727-734. eISSN 1369-9261. Article.
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Copper(II) complexes of amino acid derivatives of bis(imidazol-2-yl)methylamine (BIMA), α-Asp–BIMA, α-Glu–BIMA, γ-Glu–BIMA and β-Ala–BIMA, were studied by potentiometric, UV-VIS and EPR techniques. The bis(imidazol-2-yl)methyl residue is the main binding site in strong acidic medium in all cases. The formation of ligand-bridged dinuclear [Cu2L2]2+ species was detected in an equimolar solution of α-Asp–BIMA and γ-Glu–BIMA with binding of the N-terminal amino and carboxylate groups. The deprotonation of amide nitrogen takes place above pH 6 for the ligands containing an amide group in a chelatable position with terminal amino group (α-Asp–BIMA, α-Glu–BIMA and β-Ala–BIMA), resulting in the formation of dinuclear [Cu2H–2L2] species with imidazole bridging. For these 3 ligands, deprotonation of the pyrrole-type nitrogen was observed and the existence of a trinuclear species [Cu3H–4L2] was assumed in alkaline solution. This species contains negatively charged imidazolato bridges.
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