The coordination abilities of tetrapeptides containing beta-amino acids towards Cu(II) ions are presented. The studied tetrapeptides were: Ac-betaAlaHisGlyHis, betaAlaHisGlyHis, Ac-betaAspHisGlyHis, betaAspHisGlyHis, Ac-betaAspHisGly-dHis and betaAspHisGly-dHis. Thorough potentiometric titrations were carried out to establish the stoichiometry of the resulting metal-ligand complexes and the role of free -alphaCOO(-) side chain group in metal binding. The copper(II) coordination mode of the complexes was investigated by performing detailed spectroscopic analyses (UV-Vis, EPR, CD) in strict correlation with potentiometric measurements.
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