Stability constants have been measured for the formation of 1:1 complexes between eight divalent metal ions and six carboxylate anions. For each anion the stabilities of the complexes follow the order Pb2+ > Cu2+ > Cd2+ > Zn2+ > Ni2+ ~ Co2+ > Ca2+ ~ Mg2+. The stabilities of the complexes with each metal ion are directly related to the basicities of the anions, and little or no bidentate chelation occurs between these metal ions and acetoxyacetic acid or N-acetylglycine.
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Bunting et al. (1970) studied this question.
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