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.

Copper(II) complexes with L-lysine and L-ornithine: is the side-chain involved in the coordination? A thermodynamic and spectroscopic study

CONTINO, Annalinda;MACCARRONE, Giuseppe;
2000

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.
Calorimetry ; Copper; Aminoacids; ESR
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11769/11595
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