Complexation of thorium(iv) with acetate at variable temperatures
Linfeng RaoGlenn T. Seaborg Center, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. [email protected]Zhicheng ZhangGlenn T. Seaborg Center, Lawrence Berkeley National Laboratory, Berkeley, CA, USAP. ZanonatoDipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, Padova, ItalyPlinio Dí BernardoDipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, Padova, ItalyArturo BismondoSue B. ClarkWashington State University, Pullman, WA, USA
2004en
ABI
Аннотация
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.
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