Abstract

The combination of two bidentate ligands, the acidic thenolytrifluoroacetone and the Lewis base phenanthroline or dipyridyl, produces a very strong synergic effect in solvent extraction of lanthanides and bivalent transition metals. The stability constants of the mixed adducts have been determined in benzene, cyclohexane, carbon tetrachloride and chloroform at 25°C. In some cases, values of enthalpy and entropy changes associated with the formation of the synergic adducts have been derived from stability constants calculated at different temperatures.

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