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Elsevier, Thermochimica Acta, 1-2(362), p. 13-23

DOI: 10.1016/s0040-6031(00)00633-x

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Copper(II) complexes with l-lysine and l-ornithine: is the side-chain involved in the coordination?

Journal article published in 2000 by Chiara Conato, Annalinda Contino ORCID, Giuseppe Maccarrone, Antonio Magrı̀ ORCID, Maurizio Remelli ORCID, Giovanni Tabbı̀
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This paper is available in a repository.

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Abstract

The involvement of the omega -NH2 terminal group of L-lysine and L-ornithine in the complexation of Cu(II) was investigated by means of potentiometry, calorimetry, UV-Vis and ESR. The thermodynamic parameters (DeltaG(0), DeltaH(0) and DeltaS(0)) obtained by combining the potentiometric and calorimetric data show that the two ligands complex copper(II) in a different manner, indicating that the omega -NH2 terminal group is involved in ornithine complexes only. UV-Vis and ESR spectra further support the involvement of ornithine omega -NH2 and provide details on the complexation geometries of the complexes of the two amino acids. (C) 2000 Elsevier Science B.V. All rights reserved.