The complexation between Th(IV) and acetate in 1.05 mol kg(-1) NaClO4 was studied at variable temperatures (10, 25, 40, 55 and 70degreesC). The formation constants of five successive complexes, Th(Ac)(j)((4-j)+) where Ac=CH3COO- and j=1-5, and the molar enthalpies of complexation were determined by potentiometry and calorimetry. Extended X-ray absorption fine structure spectroscopy (EXAFS) provided additional information on the complexes in solution. The effect of temperature on the stability of the complexes is discussed in terms of the electrostatic model.
Complexation of Thorium(IV) with Acetate at Variable Temperatures
ZANONATO, PIER LUIGI;DI BERNARDO, PLINIO;
2004
Abstract
The complexation between Th(IV) and acetate in 1.05 mol kg(-1) NaClO4 was studied at variable temperatures (10, 25, 40, 55 and 70degreesC). The formation constants of five successive complexes, Th(Ac)(j)((4-j)+) where Ac=CH3COO- and j=1-5, and the molar enthalpies of complexation were determined by potentiometry and calorimetry. Extended X-ray absorption fine structure spectroscopy (EXAFS) provided additional information on the complexes in solution. The effect of temperature on the stability of the complexes is discussed in terms of the electrostatic model.
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