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.
|Titolo:||Copper(II) complexes with L-lysine and L-ornithine: is the side-chain involved in the coordination? A thermodynamic and spectroscopic study|
|Autori interni:||CONTINO, Annalinda|
|Data di pubblicazione:||2000|
|Appare nelle tipologie:||1.1 Articolo in rivista|