Potentiometric and spectroscopic studies of transition metal complexes of bis(imidazolyl) and bis(pyridyl) derivatives of amino acids

Várnagy, Katalin and Sóvágó, Imre and Goll, Wolfang and Süli-Vargha, Helga and Micera, Giovanni and Sanna, Daniele (1998) Potentiometric and spectroscopic studies of transition metal complexes of bis(imidazolyl) and bis(pyridyl) derivatives of amino acids. Inorganica Chimica Acta, Vol. 283 (1), p. 233-242. ISSN 0020-1693. Article.

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DOI: 10.1016/S0020-1693(98)00230-8

Abstract

Copper(II) and zinc(II) complexes of H-Gly-BIMA (glycinamido-bis(imidazol-2-yl)methane) and copper(II), nickel(II), cobalt(II) and zinc(II) complexes of Prodipa (prolineamido-bis(pyridin-2-yl)methane) were studied by potentiometry, electron paramagnetic resonance and visible spectroscopy. The data revealed that both ligands are ambidentate. Imidazole and pyridine nitrogens of H-Gly-BIMA and Prodipa, respectively, are the exclusive binding sites in acidic media, but the metal binding ability of the bis(imidazolyl) residue is much higher than that of the bis(pyridyl) ligand. The coordination of the amino, amide and imidazole/pyridine nitrogens was concluded around physiological pH, which resulted in the formation of an imidazole bridged dimeric species in the case of H-Gly-BIMA.

Item Type:	Article
ID Code:	1463
Status:	Published
Refereed:	Yes
Uncontrolled Keywords:	Electrochemistry, transition metal complexes, amino acid derivative complexes
Subjects:	Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Divisions:	001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:	Elsevier
ISSN:	0020-1693
Additional Information:	Pubblicato online il 28 giugno 1999.
Deposited On:	18 Aug 2009 10:05

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