Electrochemical behavior of copper(II)-dipeptide complexes in mixed solvents

Abstract Several copper(II)-dipeptide complexes were investigated in water-solvent (acetonitrile, N , N - dimethylformamide and dimethylsulfoxide) mixtures by electrochemical methods. The effects of the solvents on the reduction potentials of the copper- (II) dipeptide complexes were discussed. The reduction potentials in mixed solvents were different from those in aqueous solution and the order of reduction potentials was found to be due to the functional groups of the amino acid residue of the peptides in spite of quasi-reversible electrode reactions for the complexes.