Várnagy, Katalin and Garribba, Eugenio and Sanna, Daniele and Sóvágó, Imre and Micera, Giovanni (2005) Potentiometric and spectroscopic studies on copper(II) complexes of non-proteinogenic histidine analogues. Polyhedron, Vol. 24 (7), p. 799-806. ISSN 0277-5387. Article.
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Copper(II) complexes of the histidine analogues: β-(2-pyridyl)-dl-alanine, β-(2-thienyl)-dl-alanine, β-(1,2,4-triazol-1-yl)-dl-alanine, β-(2-thiazolyl)-dl-alanine ligands, and for comparison α-(2-thienyl)glycine and 2-(2-aminoethyl)pyridine, were studied by potentiometric, UV–VIS, EPR and thermogravimetric techniques. The amino acid residues of the ligands were described as the main binding sites forming mono- and bis-(ligand) complexes, but the interaction between aromatic triazolyl and pyridyl nitrogen atoms and the copper(II) ion also was detected in the case of β-(1,2,4-triazol-1-yl)-dl-alanine and β-(2-pyridyl)-dl-alanine. The presence of heteroaromatic rings in the amino acid analogues influences the amino acid like coordination mode in the order imidazole > pyridyl ~ triazolyl > thiazolyl ~ thienyl rings.
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