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Thermodynamical and Structural Study of Protactinium(V) Oxalate Complexes in Solution

Abstract : The complexation of protactinium(V) by oxalate was studied by X-ray absorption spectroscopy (XAS), density functional theory (DFT) calculations, capillary electrophoresis coupled with inductively coupled plasma mass spectrometry (CE-ICP-MS) and solvent extraction. XAS measurements showed unambiguously the presence of a short single oxo-bond, and the deduced structure agrees with theoretical calculations. CE-ICP-MS results indicated the formation of a highly charged anionic complex. The formation constants of PaO(C2O4)+, PaO(C2O4)2−, and PaO(C2O4)33− were determined from solvent extraction data by using protactinium at tracer scale (CPa < 10−10 M). Complexation reactions of Pa(V) with oxalate were found to be exothermic with relatively high positive entropic variation.
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http://hal.in2p3.fr/in2p3-00533669
Contributor : Sophie Heurteau <>
Submitted on : Monday, November 8, 2010 - 10:29:12 AM
Last modification on : Thursday, November 19, 2020 - 8:06:01 AM

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M. Mendes, S. Hamadi, C. Le Naour, J. Roques, A. Jeanson, et al.. Thermodynamical and Structural Study of Protactinium(V) Oxalate Complexes in Solution. Inorganic Chemistry, American Chemical Society, 2010, 49, pp.9962-9971. ⟨10.1021/ic101189w⟩. ⟨in2p3-00533669⟩

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