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Mendes M, Leguay S, Le Naour C, et al. Thermodynamic study of the complexation of protactinium(V) with diethylenetriaminepentaacetic acid. Inorg Chem. 2013;52(13):7497-507doi: 10.1021/ic400378t.
Mendes, M., Leguay, S., Le Naour, C., Hamadi, S., Roques, J., Moisy, P., Guillaumont, D., Topin, S., Aupiais, J., Den Auwer, C., & Hennig, C. (2013). Thermodynamic study of the complexation of protactinium(V) with diethylenetriaminepentaacetic acid. Inorganic chemistry, 52(13), 7497-507. https://doi.org/10.1021/ic400378t
Mendes, Mickaël, et al. "Thermodynamic study of the complexation of protactinium(V) with diethylenetriaminepentaacetic acid." Inorganic chemistry vol. 52,13 (2013): 7497-507. doi: https://doi.org/10.1021/ic400378t
Mendes M, Leguay S, Le Naour C, Hamadi S, Roques J, Moisy P, Guillaumont D, Topin S, Aupiais J, Den Auwer C, Hennig C. Thermodynamic study of the complexation of protactinium(V) with diethylenetriaminepentaacetic acid. Inorg Chem. 2013 Jul 01;52(13):7497-507. doi: 10.1021/ic400378t. Epub 2013 Jun 17. PMID: 23767403.
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Inorg Chem. 2013 Jul 01;52(13):7497-507. doi: 10.1021/ic400378t. Epub 2013 Jun 17.

Thermodynamic study of the complexation of protactinium(V) with diethylenetriaminepentaacetic acid.

Inorganic chemistry

Mickaël Mendes, Sébastien Leguay, Claire Le Naour, Séna Hamadi, Jérôme Roques, Philippe Moisy, Dominique Guillaumont, Sylvain Topin, Jean Aupiais, Christophe Den Auwer, Christoph Hennig

Affiliations

  1. CNRS-Université Paris-Sud, IPN 15 rue Georges Clémenceau, F-91406 Orsay, France.

PMID: 23767403 DOI: 10.1021/ic400378t

Abstract

The complex formation of protactinium(V) with DTPA was studied at different temperatures (25-50 °C) and ionic strengths (0.1-1 M) with the element at tracer scale. Irrespective of the temperature and ionic strength studied, only one neutral complex with (1:1) stoichiometry was identified from solvent extraction and capillary electrophoresis coupled to ICP-MS (CE-ICP-MS) experiments. Density Functional Theory (DFT) calculations revealed that two complexes can be considered: Pa(DTPA) and PaO(H2DTPA). The associated formation constants were determined from solvent extraction data at different ionic strengths and temperatures and then extrapolated to zero ionic strength by SIT methodology. These constants are valid, regardless of complex form, Pa(DTPA) or PaO(H2DTPA). The standard thermodynamic data determined with these extrapolated constants revealed a very stable complex formed energetically by an endothermic contribution which is counter balanced by a strong entropic contribution. Both, the positive enthalpy and entropy energy terms suggest the formation of an inner sphere complex.

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