Abstract
The binding ability of cadmium(II), lead(II), and zinc(II) with N,N′-(S,S)bis[1-carboxy-2-(imidazol-4yl)ethyl]ethylenediamine (BCIEE) and the structure of the formed complexes have been investigated, in aqueous solution, by potentiometry and 1H NMR and 13C NMR spectroscopy for the first time. Stability constants for the cadmium, lead, and zinc complexes with BCIEE were studied by glass electrode potentiometry (GEP) at a fixed total ligand to total metal concentration ratios, varied pH values at (25.0 ± 0.1) °C, and an ionic strength of 0.1 M KCl. For the Cd-BCIEE and Pb-BCIEE systems, three species, MH2L, MHL, and ML, were identified. For the Cd-BCIEE system, the overall stability constants values are 20.63 ± 0.02, 14.78 ± 0.01, and 8.22 ± 0.02, respectively. For the Pb-BCIEE system, the overall stability constants values are 19.71 ± 0.02, 13.78 ± 0.02, and 6.63 ± 0.02, respectively. For the Zn-BCIEE system, two species, ZnH2L and ZnL, were identified, and the overall stability constants values are 21.84 ...
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