In a total of 39 equilibrium systems, the stability constants of mixed dipeptide-amino-acid complexes of copper(II) have been determined at 25 °C and ionic strength I = 0.2 mol dm-3 KCl. The dipeptides used are glycylglycine, glycyl-DL-α-alanine, and DL-α-alanyl-DL-α-alanine, and the amino-acids are glycine, α-alanine, α-aminobutyric acid, norvaline, β-alanine, serine, threonine, ornithine, lysine, asparagine, glutamine, aspartic acid, and glutamic acid. From the exceptionally high relative stabilities of the mixed-ligand complexes containing β-alanine and aspartic acid, it is concluded that in these complexes the amino-acids occupy one equatorial and one axial site in the co-ordination sphere of the copper(II).
|Number of pages||3|
|Journal||Journal of the Chemical Society, Dalton Transactions|
|Publication status||Published - Dec 1 1977|
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