Abstract
N-(2-pyridylmethyl)iminodiacetic acid was prepared and the stoichiometric stability constants of its proton and metal complexes were measured potentiometrically at 20 deg in a medium of constant ionic strength, mu = 0.1M. The stability order is Li/sup +/ < Ba/sup 2+/ < Sr/sup 2+/ < Tl+ < Mg/ sup 2+/ < Ca/sup 2+/ < Ag/sup +/ < Mn/sup 2+/ < Fe/sup 2+/ < Cd/sup 2+/ < Pb/sup 2+/ < Zn/sup 2+/ for 1: 1 complexe s. However, 1:2 complexes are formed with Mn/ sup 2+/, Co/sup 2+/, Cu/sup 2+/, and Cd/sup 2+/. The magnitudes of the stability constants are only slightly less than those for corresponding complexes of the much more basic aliphatic analog ethylenediamine-N,Ndiacetic acid; possible reasons for this are discussed. (auth)
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