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Potentiometry and 1 H NMR have been used to study the protonation of a new series of 12-, 13-, 15-, 16- and 17-membered metal-chelating macrocycles with two or three pendant carboxymethyl groups. In the 12- and 13-membered macrocycles, ethylenediaminetetraacetate and ethylenediamine or propanediamine units are linked by two amide groups; in the 15-, 16-, and 17-membered macrocycles, diethylenetriaminepentaacetate...
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