title: Inner to outer-sphere coordination of plutonium(iv) with N,N-dialkyl amide: influence of nitric acid.
abstract: N,N-Dialkylamides are extensively studied as alternative organic ligands to achieve the extraction and separation of uranium(vi) and plutonium(iv). We report here the coordination structures of the plutonium(iv) ion with N,N-di(2-ethylhexyl)-n-butanamide as a function of nitric acid concentration in the aqueous phase. The coordination structure of Pu(iv) evolves gradually with increasing nitric acid concentration from an inner-sphere with two coordinated amide ligands toward an outer-sphere hexanitrate complex with only nitrate ions in the first coordination sphere and protonated amide ligands in the outer shell.
authors.affiliation: CEA Marcoule, Nuclear Energy Division, RadioChemistry & Processes Department, DRCP 30207 Bagnols-sur-Cèze, France Bagnols sur Cèze, France. thomas.dumas@cea.fr.
authors.forename: Eléonor
authors.initials: E
authors.lastname: Acher
authors.affiliation: CEA Marcoule, Nuclear Energy Division, RadioChemistry & Processes Department, DRCP 30207 Bagnols-sur-Cèze, France Bagnols sur Cèze, France. thomas.dumas@cea.fr.
authors.forename: Thomas
authors.identifier: http://orcid.org/0000-0001-6425-6484
authors.initials: T
authors.lastname: Dumas
authors.affiliation: CEA Marcoule, Nuclear Energy Division, RadioChemistry & Processes Department, DRCP 30207 Bagnols-sur-Cèze, France Bagnols sur Cèze, France. thomas.dumas@cea.fr.
authors.forename: Christelle
authors.initials: C
authors.lastname: Tamain
authors.affiliation: CEA Marcoule, Nuclear Energy Division, RadioChemistry & Processes Department, DRCP 30207 Bagnols-sur-Cèze, France Bagnols sur Cèze, France. thomas.dumas@cea.fr.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Boubals
authors.affiliation: Synchrotron SOLEIL, L'Orme des Merisiers, BP 48, St Aubin, 91192 Gif sur Yvette, France.
authors.forename: Pier Lorenzo
authors.initials: PL
authors.lastname: Solari
authors.affiliation: CEA Marcoule, Nuclear Energy Division, RadioChemistry & Processes Department, DRCP 30207 Bagnols-sur-Cèze, France Bagnols sur Cèze, France. thomas.dumas@cea.fr.
authors.forename: Dominique
authors.initials: D
authors.lastname: Guillaumont