Abstract
Using the MINIQUAD-75 program, stability constants of heteroligand (ternary) copper(II) complexes with N-alkylated derivatives of valine and proline or hydroxyproline were evaluated from potentiometric titration data. In the majority of combinations, heteroligand complexes appear to be the favoured species at equilibrium with the two corresponding homoligand complexes. The extent of this disproportion reaction depends strongly on the optical configuration of the constituent amino acid ligands, which implies that enantioselectivity is a common feature in copper complexes with N-alkylamino acids.
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