Abstract

SummaryAn electromigration technique was used for measurements of metal-ligand formation constants of non-carrier-free160Tb3+with glycolate,D-gluconate andα-isosaccharinate ligands. The overall ion mobilities of Tb at different concentrations of the ligands were measured in chemically inert perchlorate solutions (pH 7 andT= 298.1K) with an overall ionic strengthμ= 0.1. The stepwise stoichiometric stability constants are: Tb3+/glycolate: logK1=2.72(18), logK2=1.73(19), logK3= 1.12(17), Tb3+/D-gluconate: logK1=2.96(11), logK2=2.60(11), logK3=1.13(9), Tb3+/α-ISA: logK1=3.07(8), logK2= 2.69(11), logK3= 1.80(12).

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