Issue 8, 2002
From the journal:

Journal of the Chemical Society, Dalton Transactions

Complexation of uranium(vi) with acetate at variable temperatures

Jun Jiang,a   Linfeng Rao,*a   Plinio Di Bernardo,b   PierLuigi Zanonatob  and  Arturo Bismondoc  

* Corresponding authors

a Glenn T. Seaborg Center, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
E-mail: LRao@lbl.gov

b Università di Padova, via Loredan 4, Padova, 35131, Italy

c Istituto di Chimica e Tecnologie dei Materiali Avanzati del C.N.R. of Padova, Italy

Abstract

The complexation between uranium(VI) and acetate in 1.05 mol kg−1 NaClO4 was studied at variable temperatures (25, 35, 45, 55 and 70 °C). The formation constants of three successive complexes, UO2(OOCCH3)+, UO2(OOCCH3)2 and UO2(OOCCH3)3−, and the molar enthalpies of complexation were determined by potentiometry and calorimetry. Extended X-ray Absorption Fine Structure Spectroscopy (EXAFS) provided structural information to identify the coordination modes of the acetate in the complexes in solution, which helped to interpret the trends in the enthalpy and entropy of the complexation. The effect of temperature on the stability of the complexes is discussed in terms of the electrostatic model.

Graphical abstract: Complexation of uranium(vi) with acetate at variable temperatures

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Article information

DOI
https://doi.org/10.1039/B106642K
Article type
Paper
Submitted
25 Jul 2001
Accepted
31 Jan 2002
First published
14 Mar 2002

J. Chem. Soc., Dalton Trans., 2002, 1832-1838

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Complexation of uranium(VI) with acetate at variable temperatures

J. Jiang, L. Rao, P. D. Bernardo, P. Zanonato and A. Bismondo, J. Chem. Soc., Dalton Trans., 2002, 1832 DOI: 10.1039/B106642K

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