Abstract
Stepwise stability constant ratios for some transition metal and zinc amino acid complexes are analyzed. It is shown that the observed ratios for Cu and Ni amino acid complexes are larger than the calculated ratios by a factor R, the Bjerrum rest effect. It is suggested that the rest effect is due to metal–nitrogen covalency, there being sufficient transfer of charge from ligand to metal in the first association stage to reduce markedly the electrostatic attraction between ligand and metal in the second.For Zn complexes, the observed and calculated ratios are in excellent agreement. A small rest effect would seem to be present in the Co system, but experimental errors render any conclusions uncertain.
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