STABILITIES OF SOME TRIVALENT AND DIVALENT METAL ION COMPLEXES OF N,N′-BIS(2-MERCAPTOETHYL)ETHYLENEDIAMINE-N,N′-DIACETIC ACID, AN EFFECTIVE LIGAND FOR INDIUM(III)

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Abstract
Potentiometric methods have been used to determine the equilibrium constants of indium(III), gallium(III), zinc(II), cadmium(II) and lead(II) with the ligand N,N′-bis(2-mercaptoethyl)ethylene-diamine-N,N′-diacetic acid. The results reveal that this ligand has unusually high affinity for both In(III) and Ga(III). The formation constant (KML = [ML]/[M][L] in 0.100 M KCl at 25.0° for In(III) is 1037.0 and its pM at physiological pH (7.4 with 100% excess of the ligand) is 30.4, which are higher than those of any other previously reported ligand for In(III).