Abstract
Formation constants of the first two chelate species formed by rare earth and yttrium ions with propionate, methoxy acetate, and thioglycoate ligands were determined by a potentiometric method at 20 deg C and an ionic strength of 0.10. The supporting electrolyte was sodium perchlorate. The data indicate that methoxyacetate and thioglycolate ( alpha mercaptoacetate) ligands behave essentially as monodentate ligands, as do acetate and propionate. It is apparent that the affinity of the simple carboxylic acid ligands for rare earth ions decreases in the order acetate > propionate > isobutyrate. It is also clear that the order of the electrondonating ability of the functional groups studied is OH >> OCH/sub 3/ > SH. The ionization constants of propionic, methoxyacetic, and thioglycolic acids were determined at 20 deg C and an ionic strength of 0.10. (auth)
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