Complexation of thorium(IV) with acetate at variable temperatures

The complexation between Th(IV) and acetate in 1.05 mol kg(-1) NaClO4 was studied at variable temperatures (10, 25, 40, 55 and 70 degrees C). 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 b...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2004-09 (18), p.2867-2872
Main Authors: Rao, Linfeng, Zhang, Zhicheng, Zanonato, PierLuigi, Di Bernardo, Plinio, Bismondo, Arturo, Clark, Sue B
Format: Article
Language:English
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Summary:The complexation between Th(IV) and acetate in 1.05 mol kg(-1) NaClO4 was studied at variable temperatures (10, 25, 40, 55 and 70 degrees C). 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.
ISSN:1477-9226
1477-9234
DOI:10.1039/b407389d