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Issue 6, 2014
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A calorimetric study of the hydrolysis and peroxide complex formation of the uranyl(vi) ion

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Abstract

The enthalpies of reaction for the formation of uranyl(VI) hydroxide {[(UO2)2(OH)2]2+, [(UO2)3(OH)4]2+, [(UO2)3(OH)5]+, [(UO2)3(OH)6](aq), [(UO2)3(OH)7], [(UO2)3(OH)8]2−, [(UO2)(OH)3], [(UO2)(OH)4]2−} and peroxide complexes {[UO2(O2)(OH)] and [(UO2)2(O2)2(OH)]} have been determined from calorimetric titrations at 25 °C in a 0.100 M tetramethyl ammonium nitrate ionic medium. The hydroxide data have been used to test the consistency of the extensive thermodynamic database published by the Nuclear Energy Agency (I. Grenthe, J. Fuger, R. J. M. Konings, R. J. Lemire, A. B. Mueller, C. Nguyen-Trung and H. Wanner, Chemical Thermodynamics of Uranium, North-Holland, Amsterdam, 1992 and R. Guillaumont, T. Fanghänel, J. Fuger, I. Grenthe, V. Neck, D. J. Palmer and M. R. Rand, Update on the Chemical Thermodynamics of Uranium, Neptunium, Plutonium, Americium and Technetium, Elsevier, Amsterdam, 2003). A brief discussion is given about a possible structural relationship between the trinuclear complexes [(UO2)3(OH)n]6−n, n = 4–8.

Graphical abstract: A calorimetric study of the hydrolysis and peroxide complex formation of the uranyl(vi) ion

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Supplementary files

Article information


Submitted
16 Oct 2013
Accepted
13 Nov 2013
First published
03 Dec 2013

Dalton Trans., 2014,43, 2378-2383
Article type
Paper

A calorimetric study of the hydrolysis and peroxide complex formation of the uranyl(VI) ion

P. L. Zanonato, P. Di Bernardo and I. Grenthe, Dalton Trans., 2014, 43, 2378
DOI: 10.1039/C3DT52922C

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