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The complexation behaviour of Cu(II) with di- and tri­peptides containing the aromatic amino acids phenylalanine or tryptophan has been investigated at different pH-values and compared with results obtained with di- and triglycine. The results obtained by means of ESR and optical absorp­tion spectroscopy show an influence of the two different aromatic entities on the magnetic and optical parameters. A significant decrease of the g ‖ -value and, concomittantly, an increase of the energy of the d-d transition was measured when an aromatic entity is present in the peptide. A possible explanation for this observation is given.

On the Influence of Aromatic Residues on the Interaction of Copper (II) with Small Peptides Containing Aromatic Amino Acids: ESR and Optical Studies