1
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Shaaban T, Réal F, Maurice R, Vallet V. Stability of the protactinium(V) mono-oxo cation probed by first-principle calculations. Chemistry 2024:e202304068. [PMID: 38240195 DOI: 10.1002/chem.202304068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Indexed: 02/22/2024]
Abstract
This study explores the distinctive behavior of protactinium (Z=91) within the actinide series. In contrast to neighboring elements like uranium or plutonium, protactinium in the pentavalent state diverges by not forming the typical dioxo protactinyl moiety PaO2 + in aqueous phase. Instead, it manifests as a monooxo PaO3+ cation or a Pa5+ . Employing first-principle calculations with implicit and explicit solvation, we investigate two stoichiometrically equivalent neutral complexes: PaO(OH)2 (X)(H2 O) and Pa(OH)4 (X), where X represents various monodentate and bidentate ligands. Calculating the Gibbs free energy for the reaction PaO(OH)2 (X)(H2 O)→Pa(OH)4 (X), we find that the PaO(OH)2 (X)(H2 O) complex is stabilized with Cl- , Br- , I- , NCS- , NO3 - , and SO4 2- ligands, while it is not favored with OH- , F- , and C2 O4 2- ligands. Quantum Theory of Atoms in Molecules (QTAIM) and Natural Bond Orbital (NBO) methods reveal the Pa mono-oxo bond as a triple bond, with significant contributions from the 5f and 6d shells. Covalency of the Pa mono-oxo bond increases with certain ligands, such as Cl- , Br- , I- , NCS- , and NO3 - . These findings elucidate protactinium's unique chemical attributes and provide insights into the conditions supporting the stability of relevant complexes.
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Affiliation(s)
- Tamara Shaaban
- Univ. Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers Atomes et Molécules, F-59000, Lille, France
| | - Florent Réal
- Univ. Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers Atomes et Molécules, F-59000, Lille, France
| | - Rémi Maurice
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) -, UMR 6226, F-35000, Rennes, France
| | - Valérie Vallet
- Univ. Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers Atomes et Molécules, F-59000, Lille, France
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2
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Kalintsev A, Guan Q, Brugger J, Migdisov A, Etschmann B, Ram R, Liu W, Mei Y, Testemale D, Xu H. Nature and coordination geometry of geologically relevant aqueous Uranium(VI) complexes up to 400 ºC: A review and new data. JOURNAL OF HAZARDOUS MATERIALS 2023; 452:131309. [PMID: 37018892 DOI: 10.1016/j.jhazmat.2023.131309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 03/23/2023] [Accepted: 03/26/2023] [Indexed: 06/19/2023]
Abstract
The structure of the uranyl aqua ion (UO22+) and a number of its inorganic complexes (specifically, UO2Cl+, UO2Cl20, UO2SO40, [Formula: see text] , [Formula: see text] and UO2OH42-) have been characterised using X-Ray absorption spectroscopy/extended X-Ray absorption fine structure (XAS/EXAFS) at temperatures ranging from 25 to 326 ºC. Results of ab initio molecular dynamics (MD) calculations are also reported for uranyl in chloride and sulfate-bearing fluids from 25 to 400 ºC and 600 bar to 20 kilobar (kb). These results are reported alongside a comprehensive review of prior structural characterisation work with particular focus given to EXAFS works to provide a consistent and up-to-date view of the structure of these complexes under conditions relevant to U mobility in ore-forming systems and around high-grade nuclear waste repositories. Regarding reported EXAFS results, average equatorial coordination was found to decrease in uranyl and its sulfate and chloride complexes as temperature rose - the extent of this decrease differed between species and solution compositions but typically resulted in an equatorial coordination number of ∼3-4 at temperatures above 200 ºC. The [Formula: see text] complex was observed at temperatures from 25 to 247 ºC and exhibited no major structural changes over this temperature range. UO2OH42- exhibited only minor structural changes over a temperature range from 88 to 326 ºC and was suggested to manifest fivefold coordination with four hydroxyl molecules and one water molecule around its equator. Average coordination values derived from fits of the reported EXAFS data were compared to average coordination values calculated using the experimentally derived thermodynamic data for chloride complexes reported by Dargent et al. (2013) and Migdisov et al. (2018b), and for sulfate complexes reported by Alcorn et al. (2019) and Kalintsev et al. (2019). Sulfate EXAFS data were well described by available thermodynamic data, and chloride EXAFS data were described well by the thermodynamic data of Migdisov et al. (2018b), but not by the data of Dargent et al. (2013). The ab initio molecular dynamics calculations confirmed the trends in equatorial coordination observed with EXAFS and were also able to provide an insight into the effect of pressure in equatorial water coordination - for a given temperature, higher pressures appear to lead to a greater number of equatorially bound waters counteracting the temperature effect.
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Affiliation(s)
- Alexander Kalintsev
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia; Los Alamos National Laboratory, Earth & Environmental Division, Los Alamos, NM, USA.
| | - Qiushi Guan
- CSIRO Mineral Resources, Kensington, WA 6151, Australia
| | - Joël Brugger
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia
| | - Artas Migdisov
- Los Alamos National Laboratory, Earth & Environmental Division, Los Alamos, NM, USA
| | - Barbara Etschmann
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia
| | - Rahul Ram
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia
| | - Weihua Liu
- CSIRO Mineral Resources, Kensington, WA 6151, Australia
| | - Yuan Mei
- CSIRO Mineral Resources, Kensington, WA 6151, Australia
| | - Denis Testemale
- CNRS, Université Grenoble Alpes, Institut NEEL, Grenoble F-38000, France
| | - Hongwu Xu
- Los Alamos National Laboratory, Earth & Environmental Division, Los Alamos, NM, USA
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3
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Le Naour C, Maloubier M, Aupiais J. The speciation of protactinium since its discovery: a nightmare or a path of resilience. RADIOCHIM ACTA 2022. [DOI: 10.1515/ract-2021-1126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
This review concerns the speciation of protactinium in aqueous solution under its both oxidation states +IV and +V. Emphasis is placed on experimental data obtained at trace level but also in macroscopic amount leading to the determination of thermodynamic and structural data. Thus, the complexation of Pa(V) with mineral acids and organic acids, mainly polyaminocarboxylic acids (iminodiacetic acid [IDA], nitrilotriacetic acid [NTA], ethylenediaminetetraacetic acid [EDTA] and diethylenetriaminepentaacetic acid [DTPA]) are highlighted and compared. The review also includes the actual knowledge about the Pa(IV) aqueous chemistry pinpointing its spectroscopic features.
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Affiliation(s)
- Claire Le Naour
- Université Paris-Saclay, CNRS/IN2P3, IJCLab , 91405 Orsay , France
| | - Melody Maloubier
- Université Paris-Saclay, CNRS/IN2P3, IJCLab , 91405 Orsay , France
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4
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Abstract
Neptunium was the first actinide element to be artificially synthesized, yet, compared with its more famous neighbours uranium and plutonium, is less conspicuously studied. Most neptunium chemistry involves the neptunyl di(oxo)-motif, and transuranic compounds with one metal-ligand multiple bond are rare, being found only in extended-structure oxide, fluoride or oxyhalide materials. These combinations stabilize the required high oxidation states, which are otherwise challenging to realize for transuranic ions. Here we report the synthesis, isolation and characterization of a stable molecular neptunium(V)-mono(oxo) triamidoamine complex. We describe a strong Np≡O triple bond with dominant 5f-orbital contributions and σu > πu energy ordering, akin to terminal uranium-nitrides and di(oxo)-actinyls, but not the uranium-mono(oxo) triple bonds or other actinide multiple bonds reported so far. This work demonstrates that molecular high-oxidation-state transuranic complexes with a single metal-ligand bond can be stabilized and studied in isolation.
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5
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6
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Siberchicot B, Aupiais J, Le Naour C. Quantum molecular dynamics investigations of protactinium (V) fluoro and oxofluoro complexes in solution. RADIOCHIM ACTA 2021. [DOI: 10.1515/ract-2020-0076] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Quantum Molecular Dynamics simulations of protactinium (V) fluoro and oxofluoro complexes in solution were undertaken using density functional theory with generalised gradient approximation (and the ABINIT software package). The complexes were studied in the gas phase (at 0 K) and in solution (at 298 K) with water molecules as the solvent. We characterised all of the systems, taking into account their structures, dissociation energies, bond lengths and formation enthalpies in solution, and explained their relative stabilities. At ambient temperature, the hydrated species PaF
5,
P
a
F
4
+
$Pa{F}_{4}^{+}$
,
P
a
O
F
5
2
−
$PaO{F}_{5}^{2-}$
,
P
a
O
F
4
−
$PaO{F}_{4}^{-}$
and PaOF
3 were found to be the most stable (and to exhibit similar stabilities). The calculated formation enthalpies of the complexes are in close agreement with measurements made elsewhere.
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Affiliation(s)
- Bruno Siberchicot
- CEA, DAM, DIF , F-91297 Arpajon , France
- Université Paris-Saclay, CEA, Laboratoire Matière en Conditions Extrêmes , F-91680 Bruyères-le-Châtel , France
| | | | - Claire Le Naour
- Université Paris-Saclay, CNRS/IN2P3, IJCLab , 91405 Orsay , France
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7
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Ma J, Yang C, Han J, Hu S, Yu H, Long X. Density functional theory investigations on the coordination of Pa( v) with N, N-dialkylamide. NEW J CHEM 2020. [DOI: 10.1039/d0nj00687d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The density functional theory (DFT) method was used to study the coordination of a series of N,N-dialkylamides with Pa(v) to shed light on the inherent principles for screening amide extractants of Pa(v) from aqueous solution.
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Affiliation(s)
- Jun Ma
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang 621900
- China
| | - Chuting Yang
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang 621900
- China
| | - Jun Han
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang 621900
- China
| | - Sheng Hu
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang 621900
- China
| | - Haizhu Yu
- Department of Chemistry and Center for Atomic Engineering of Advanced Materials
- Anhui University
- Hefei 230026
- China
| | - Xinggui Long
- Institute of Nuclear Physics and Chemistry
- China Academy of Engineering Physics
- Mianyang 621900
- China
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8
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Le Naour C, Roques J, Den Auwer C, Moisy P, Aupiais J. Protactinium(V) in aqueous solution: a light actinide without actinyl moiety. RADIOCHIM ACTA 2019. [DOI: 10.1515/ract-2019-3119] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
This review highlights recent data on the complexation of Pa(V) with inorganic (fluoride and sulphate) and organic (oxalate, nitrilotriacetate, diethylenetriaminepentaacetate) ligands in solution. New thermodynamic parameters relative to the complexation of Pa(V) with sulphate are presented. The review also includes gas phase and theoretical studies focused on the interaction of Pa(V) in the dioxo and oxo forms with water.
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Affiliation(s)
- Claire Le Naour
- Institut de Physique Nucléaire, CNRS-IN2P3 , Université Paris-Sud, Université Paris-Saclay , 91406 Orsay Cedex , France
| | - Jérôme Roques
- Institut de Physique Nucléaire, CNRS-IN2P3 , Université Paris-Sud, Université Paris-Saclay , 91406 Orsay Cedex , France
| | | | - Philippe Moisy
- CEA, Nuclear Energy Division, Research Department of Mining and Fuel Recycling Processes, DMRC , BP 17171, 30207 Bagnols-sur-Cèze , France
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9
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Ma J, Yang C, Han J, Yu J, Hu S, Yu H, Long X. Density Functional Theory Investigations on the Mechanism of Formation of Pa(V) Ion in Hydrous Solutions. Molecules 2019; 24:E1169. [PMID: 30934559 PMCID: PMC6471942 DOI: 10.3390/molecules24061169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 03/18/2019] [Accepted: 03/19/2019] [Indexed: 11/16/2022] Open
Abstract
Due to the enormous threat of protactinium to the environment and human health, its disposal and chemistry have long been important topics in nuclear science. [PaO(H₂O)₆]3+ is proposed as the predominant species in hydrous and acidic solutions, but little is known about its formation mechanism. In this study, density functional theory (DFT) calculations demonstrate a water coordination-proton transfer-water dissociation mechanism for the formation of PaO3+ in hydrous solutions. First, Pa(V) ion preferentially forms hydrated complexes with a coordination number of 10. Through hydrogen bonding, water molecules in the second coordination sphere easily capture two protons on the same coordinated H₂O ligand to form [PaO(H₂O)₉]3+. Water dissociation then occurs to generate the final [PaO(H₂O)₆]3+, which is the thermodynamic product of Pa(V) in hydrous solutions.
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Affiliation(s)
- Jun Ma
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China.
| | - Chuting Yang
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China.
| | - Jun Han
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China.
| | - Jie Yu
- Department of Chemistry and Center for Atomic Engineering of Advanced Materials, Anhui University, Hefei 230601, China.
| | - Sheng Hu
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China.
| | - Haizhu Yu
- Department of Chemistry and Center for Atomic Engineering of Advanced Materials, Anhui University, Hefei 230601, China.
| | - Xinggui Long
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China.
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10
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Jahrman EP, Holden WM, Ditter AS, Mortensen DR, Seidler GT, Fister TT, Kozimor SA, Piper LFJ, Rana J, Hyatt NC, Stennett MC. An improved laboratory-based x-ray absorption fine structure and x-ray emission spectrometer for analytical applications in materials chemistry research. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:024106. [PMID: 30831699 DOI: 10.1063/1.5049383] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 02/01/2019] [Indexed: 06/09/2023]
Abstract
X-ray absorption fine structure (XAFS) and x-ray emission spectroscopy (XES) are advanced x-ray spectroscopies that impact a wide range of disciplines. However, unlike the majority of other spectroscopic methods, XAFS and XES are accompanied by an unusual access model, wherein the dominant use of the technique is for premier research studies at world-class facilities, i.e., synchrotron x-ray light sources. In this paper, we report the design and performance of an improved XAFS and XES spectrometer based on the general conceptual design of Seidler et al. [Rev. Sci. Instrum. 85, 113906 (2014)]. New developments include reduced mechanical degrees of freedom, much-increased flux, and a wider Bragg angle range to enable extended x-ray absorption fine structure (EXAFS) measurement and analysis for the first time with this type of modern laboratory XAFS configuration. This instrument enables a new class of routine applications that are incompatible with the mission and access model of the synchrotron light sources. To illustrate this, we provide numerous examples of x-ray absorption near edge structure (XANES), EXAFS, and XES results for a variety of problems and energy ranges. Highlights include XAFS and XES measurements of battery electrode materials, EXAFS of Ni with full modeling of results to validate monochromator performance, valence-to-core XES for 3d transition metal compounds, and uranium XANES and XES for different oxidation states. Taken en masse, these results further support the growing perspective that modern laboratory-based XAFS and XES have the potential to develop a new branch of analytical chemistry.
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Affiliation(s)
- Evan P Jahrman
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - William M Holden
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - Alexander S Ditter
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - Devon R Mortensen
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - Gerald T Seidler
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - Timothy T Fister
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Stosh A Kozimor
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Louis F J Piper
- Department of Physics, Binghamton University, Binghamton, New York 13902, USA
| | - Jatinkumar Rana
- Department of Physics, Binghamton University, Binghamton, New York 13902, USA
| | - Neil C Hyatt
- Materials Science and Engineering Department, The University of Sheffield, Mapping Street, Sheffield S1 3JD, United Kingdom
| | - Martin C Stennett
- Materials Science and Engineering Department, The University of Sheffield, Mapping Street, Sheffield S1 3JD, United Kingdom
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11
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Wilson RE, De Sio S, Vallet V. Protactinium and the intersection of actinide and transition metal chemistry. Nat Commun 2018; 9:622. [PMID: 29434286 PMCID: PMC5809381 DOI: 10.1038/s41467-018-02972-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 01/11/2018] [Indexed: 11/09/2022] Open
Abstract
The role of the 5f and 6d orbitals in the chemistry of the actinide elements has been of considerable interest since their discovery and synthesis. Relativistic effects cause the energetics of the 5f and 6d orbitals to change as the actinide series is traversed left to right imparting a rich and complex chemistry. The 5f and 6d atomic states cross in energy at protactinium (Pa), making it a potential intersection between transition metal and actinide chemistries. Herein, we report the synthesis of a Pa-peroxo cluster, A6(Pa4O(O2)6F12) [A = Rb, Cs, (CH3)4N], formed in pursuit of an actinide polyoxometalate. Quantum chemical calculations at the density functional theory level demonstrate equal 5f and 6d orbital participation in the chemistry of Pa and increasing 5f orbital participation for the heavier actinides. Periodic changes in orbital character to the bonding in the early actinides highlights the influence of the 5f orbitals in their reactivity and chemical structure.
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Affiliation(s)
- Richard E Wilson
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL, 60439, USA.
| | - Stephanie De Sio
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL, 60439, USA
| | - Valérie Vallet
- Université de Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers Atomes et Molécules, F-59000, Lille, France.
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12
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Luchini C, Leguay S, Aupiais J, Cannes C, Le Naour C. Complexation of protactinium(v) with nitrilotriacetic acid: a study at the tracer scale. NEW J CHEM 2018. [DOI: 10.1039/c7nj04683a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Complexation of Pa(v) with nitrilotriacetic acid (NTA) in aqueous solution (1 M (Na,H)ClO4) was studied by solvent extraction at different acidities (pcH = 0.6; 1.0; 2.0 and 2.5) with the element at the tracer scale (CPa< 10−10M).
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Affiliation(s)
- C. Luchini
- Institut de Physique Nucléaire
- CNRS-IN2P3
- Université Paris-Sud
- Université Paris-Saclay
- 91406 Orsay Cedex
| | - S. Leguay
- Institut de Physique Nucléaire
- CNRS-IN2P3
- Université Paris-Sud
- Université Paris-Saclay
- 91406 Orsay Cedex
| | | | - C. Cannes
- Institut de Physique Nucléaire
- CNRS-IN2P3
- Université Paris-Sud
- Université Paris-Saclay
- 91406 Orsay Cedex
| | - C. Le Naour
- Institut de Physique Nucléaire
- CNRS-IN2P3
- Université Paris-Sud
- Université Paris-Saclay
- 91406 Orsay Cedex
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13
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de Jong WA, Dau PD, Wilson RE, Marçalo J, Van Stipdonk MJ, Corcovilos TA, Berden G, Martens J, Oomens J, Gibson JK. Revealing Disparate Chemistries of Protactinium and Uranium. Synthesis of the Molecular Uranium Tetroxide Anion, UO4–. Inorg Chem 2017; 56:3686-3694. [DOI: 10.1021/acs.inorgchem.7b00144] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wibe A. de Jong
- Computational Research
Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Phuong D. Dau
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Richard E. Wilson
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Joaquim Marçalo
- Centro
de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela Loures, Portugal
| | - Michael J. Van Stipdonk
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, Pennsylvania 15282, United States
| | - Theodore A. Corcovilos
- Department of
Physics, Duquesne University, Pittsburgh, Pennsylvania 15282, United States
| | - Giel Berden
- Radboud University, Institute for Molecules and
Materials, FELIX Laboratory, Toernooiveld 7c, 6525ED Nijmegen, The Netherlands
| | - Jonathan Martens
- Radboud University, Institute for Molecules and
Materials, FELIX Laboratory, Toernooiveld 7c, 6525ED Nijmegen, The Netherlands
| | - Jos Oomens
- Radboud University, Institute for Molecules and
Materials, FELIX Laboratory, Toernooiveld 7c, 6525ED Nijmegen, The Netherlands
- van ‘t
Hoff Institute for Molecular Sciences, University of Amsterdam, Science
Park 904, 1098XH Amsterdam, The Netherlands
| | - John K. Gibson
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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14
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Wilson RE, De Sio S, Vallet V. Structural and Electronic Properties of Fluoride Complexes of Nb
V
, Ta
V
, and Pa
V
: The Influence of Relativistic Effects on Group V Elements. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600981] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Richard E. Wilson
- Chemical Sciences and Engineering Division Argonne National Laboratory 60439 Argonne IL USA
| | - Stéphanie De Sio
- Chemical Sciences and Engineering Division Argonne National Laboratory 60439 Argonne IL USA
| | - Valerie Vallet
- Univ. Lille CNRS UMR 8523 ‐ PhLAM ‐ Physique des Lasers Atomes et Molécules 59000 Lille France
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15
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Dau PD, Wilson RE, Gibson JK. Elucidating Protactinium Hydrolysis: The Relative Stabilities of PaO2(H2O)+ and PaO(OH)2+. Inorg Chem 2015. [DOI: 10.1021/acs.inorgchem.5b01078] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Phuong D. Dau
- Chemical Sciences
Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Richard E. Wilson
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - John K. Gibson
- Chemical Sciences
Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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16
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Knight AW, Nelson AW, Eitrheim ES, Forbes TZ, Schultz MK. A chromatographic separation of neptunium and protactinium using 1-octanol impregnated onto a solid phase support. J Radioanal Nucl Chem 2015. [DOI: 10.1007/s10967-015-4124-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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17
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Shi WQ, Yuan LY, Wang CZ, Wang L, Mei L, Xiao CL, Zhang L, Li ZJ, Zhao YL, Chai ZF. Exploring actinide materials through synchrotron radiation techniques. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:7807-7848. [PMID: 25169914 DOI: 10.1002/adma.201304323] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 04/24/2014] [Indexed: 06/03/2023]
Abstract
Synchrotron radiation (SR) based techniques have been utilized with increasing frequency in the past decade to explore the brilliant and challenging sciences of actinide-based materials. This trend is partially driven by the basic needs for multi-scale actinide speciation and bonding information and also the realistic needs for nuclear energy research. In this review, recent research progresses on actinide related materials by means of various SR techniques were selectively highlighted and summarized, with the emphasis on X-ray absorption spectroscopy, X-ray diffraction and scattering spectroscopy, which are powerful tools to characterize actinide materials. In addition, advanced SR techniques for exploring future advanced nuclear fuel cycles dealing with actinides are illustrated as well.
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Affiliation(s)
- Wei-Qun Shi
- Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Institute of High Enegy Physics, Chinese Academy of Sciences, Beijing, 100049, China
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18
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De Sio SM, Wilson RE. EXAFS Study of the Speciation of Protactinium(V) in Aqueous Hydrofluoric Acid Solutions. Inorg Chem 2014; 53:12643-9. [DOI: 10.1021/ic502376m] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stéphanie M. De Sio
- Chemical Sciences and Engineering
Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Richard E. Wilson
- Chemical Sciences and Engineering
Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
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19
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De Sio SM, Wilson RE. Structural and Spectroscopic Studies of Fluoroprotactinates. Inorg Chem 2014; 53:1750-5. [DOI: 10.1021/ic402877a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Stéphanie M. De Sio
- Chemical Sciences and Engineering
Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Richard E. Wilson
- Chemical Sciences and Engineering
Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
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20
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Moll H, Rossberg A, Steudtner R, Drobot B, Müller K, Tsushima S. Uranium(VI) Chemistry in Strong Alkaline Solution: Speciation and Oxygen Exchange Mechanism. Inorg Chem 2014; 53:1585-93. [DOI: 10.1021/ic402664n] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Henry Moll
- Institute
of Resource Ecology, Helmholtz−Zentrum Dresden−Rossendorf (HZDR), Bautzner Landstraße 400, Dresden 01328, Germany
| | - André Rossberg
- Institute
of Resource Ecology, Helmholtz−Zentrum Dresden−Rossendorf (HZDR), Bautzner Landstraße 400, Dresden 01328, Germany
| | - Robin Steudtner
- Institute
of Resource Ecology, Helmholtz−Zentrum Dresden−Rossendorf (HZDR), Bautzner Landstraße 400, Dresden 01328, Germany
| | - Björn Drobot
- Institute
of Resource Ecology, Helmholtz−Zentrum Dresden−Rossendorf (HZDR), Bautzner Landstraße 400, Dresden 01328, Germany
| | - Katharina Müller
- Institute
of Resource Ecology, Helmholtz−Zentrum Dresden−Rossendorf (HZDR), Bautzner Landstraße 400, Dresden 01328, Germany
| | - Satoru Tsushima
- Institute
of Resource Ecology, Helmholtz−Zentrum Dresden−Rossendorf (HZDR), Bautzner Landstraße 400, Dresden 01328, Germany
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21
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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; 52:7497-507. [DOI: 10.1021/ic400378t] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mickaël Mendes
- CNRS-Université Paris-Sud, IPN 15 rue Georges Clémenceau, F-91406
Orsay, France
| | - Sébastien Leguay
- CNRS-Université Paris-Sud, IPN 15 rue Georges Clémenceau, F-91406
Orsay, France
| | - Claire Le Naour
- CNRS-Université Paris-Sud, IPN 15 rue Georges Clémenceau, F-91406
Orsay, France
| | - Séna Hamadi
- CNRS-Université Paris-Sud, IPN 15 rue Georges Clémenceau, F-91406
Orsay, France
| | - Jérôme Roques
- CNRS-Université Paris-Sud, IPN 15 rue Georges Clémenceau, F-91406
Orsay, France
| | | | | | | | | | - Christophe Den Auwer
- Université de Nice Sofia Antipolis, Institut de Chimie de Nice 28 avenue Valrose, 06108 Nice Cedex
2, France
| | - Christoph Hennig
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of
Resource Ecology, Bautzner Landstrasse 400, D-01314 Dresden, Germany
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22
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Altmaier M, Gaona X, Fanghänel T. Recent advances in aqueous actinide chemistry and thermodynamics. Chem Rev 2013; 113:901-43. [PMID: 23369090 DOI: 10.1021/cr300379w] [Citation(s) in RCA: 145] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marcus Altmaier
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany.
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23
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Knope KE, Soderholm L. Solution and Solid-State Structural Chemistry of Actinide Hydrates and Their Hydrolysis and Condensation Products. Chem Rev 2012; 113:944-94. [DOI: 10.1021/cr300212f] [Citation(s) in RCA: 269] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Karah E. Knope
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439,
United States
| | - L. Soderholm
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439,
United States
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24
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Vidaud C, Bourgeois D, Meyer D. Bone as Target Organ for Metals: The Case of f-Elements. Chem Res Toxicol 2012; 25:1161-75. [DOI: 10.1021/tx300064m] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Claude Vidaud
- CEA, IBEB, LEPC, BP 17171, F-30207
Bagnols-sur-Cèze, France
| | - Damien Bourgeois
- ICSM, UMR 5257/CEA/CNRS/UM2/ENSCM,
BP17171, F-30207 Bagnols-sur-Cèze, France
| | - Daniel Meyer
- ICSM, UMR 5257/CEA/CNRS/UM2/ENSCM,
BP17171, F-30207 Bagnols-sur-Cèze, France
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25
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Wang D, van Gunsteren WF, Chai Z. Recent advances in computational actinoid chemistry. Chem Soc Rev 2012; 41:5836-65. [DOI: 10.1039/c2cs15354h] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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26
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Mendes M, Hamadi S, Le Naour C, Roques J, Jeanson A, Den Auwer C, Moisy P, Topin S, Aupiais J, Hennig C, Di Giandomenico MV. Thermodynamical and Structural Study of Protactinium(V) Oxalate Complexes in Solution. Inorg Chem 2010; 49:9962-71. [DOI: 10.1021/ic101189w] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mickaël Mendes
- Université Paris-Sud, Institut de Physique Nucléaire, UMR 8608 Orsay, F-91406, France
| | - Séna Hamadi
- Université Paris-Sud, Institut de Physique Nucléaire, UMR 8608 Orsay, F-91406, France
- CNRS/IN2P3, Orsay, F-91406, France
| | - Claire Le Naour
- Université Paris-Sud, Institut de Physique Nucléaire, UMR 8608 Orsay, F-91406, France
- CNRS/IN2P3, Orsay, F-91406, France
| | - Jérôme Roques
- Université Paris-Sud, Institut de Physique Nucléaire, UMR 8608 Orsay, F-91406, France
- CNRS/IN2P3, Orsay, F-91406, France
| | - Aurélie Jeanson
- Université Paris-Sud, Institut de Physique Nucléaire, UMR 8608 Orsay, F-91406, France
- CNRS/IN2P3, Orsay, F-91406, France
| | - Christophe Den Auwer
- CEA, Nuclear Energy Division, RadioChemistry and Process Department, F-30207 Bagnols sur Cèze, France
| | - Philippe Moisy
- CEA, Nuclear Energy Division, RadioChemistry and Process Department, F-30207 Bagnols sur Cèze, France
| | | | | | - Christoph Hennig
- Forschungszentrum Dresden-Rossendorf, Institute of Radiochemistry, D-01314 Dresden, Germany
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27
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Di Giandomenico MV, Naour CL, Simoni E, Guillaumont D, Moisy P, Hennig C, Conradson SD, Den Auwer C. Structure of early actinides(V) in acidic solutions. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.2009.1620] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Protactinium occupies a key position in the actinide series between thorium and uranium. In aqueous acidic solution, it is stable at oxidation state (V), occurring either as an oxocation or as a naked ion, depending on the media. Very few structural information on the hydration sphere of Pa(V) in acidic medium is available, in particular in hydrofluoric acid. Combined EXAFS and theoretical calculations have been used in this work to characterize the protactinium coordination sphere at various HF concentrations. The correlation of the XAFS data with quantum chemical calculations provides complementary structural and electronic models from ab initio techniques. At HF concentrations from 0.5 to 0.05 M, both theoretical calculations and EXAFS data suggest that the protactinium coordination sphere is mainly composed of fluoride ions. At the lowest HF concentration, the occurrence of a monooxo bond is observed with EXAFS, in agreement with the literature. A comparison of these data with related neptunium(V) and plutonium(V) diooxocations in perchloric acid is also presented.
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Affiliation(s)
| | | | - E. Simoni
- Université Paris XI, Institut de Physique Nucléaire d'Orsay, Orsay, Frankreich
| | - D. Guillaumont
- CEA Valrhô, DEN/DRCP/SCPS, B.P. 17171, Bagnols-sur-cèze cedex, Frankreich
| | - Philippe Moisy
- CEA Valrho, DEN/DRCP/SCPS, Bagnols-sue-Cèze Cedex, Frankreich
| | - Christoph Hennig
- Forschungszentrum Dresden-Rossendorf, Institut für Radiochemie, Dresden
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28
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Le Naour C, Di Giandomenico MV, Zhao Y, Mendes M. Speciation of protactinium(V) at tracer scale. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.2009.1618] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Solvent extraction in the conditions of tracer scale chemistry was used to study protactinium(V) complexation with sulphate, chloride, oxalate and diethylene-triamine-pentaacetate. Extraction experiments were conducted using the chelating agent thenoyltrifluoroacetone (TTA) in toluene at constant ionic strength and temperature. Information on the species involved in partition equilibria relative to protactinium(V) complexation were deduced from a systematic study of the variations of distribution coefficient of Pa(V) as function of ligands, protons and TTA concentration.
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Affiliation(s)
- Claire Le Naour
- CNRS/Université Paris-Sud, Institut de Physique Nucléaire, Orsay Cedex, Frankreich
| | | | | | - M. Mendes
- Institut de Physique Nucleaire, Universite Paris-Sud, Orsay Cedex, Frankreich
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29
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Di Giandomenico M, Le Naour C. Complex formation between protactinium(V) and sulfate ions at 10 and 60°C. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2009.02.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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30
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Topin S, Aupiais J, Baglan N, Vercouter T, Vitorge P, Moisy P. Trace Metal Speciation by Capillary Electrophoresis Hyphenated to Inductively Coupled Plasma Mass Spectrometry: Sulfate and Chloride Complexes of Np(V) and Pu(V). Anal Chem 2009; 81:5354-63. [DOI: 10.1021/ac900275d] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sylvain Topin
- CEA, DAM, DIF F-91297 Arpajon, France, CEA, DEN, Saclay, F-91191 Gif-sur-Yvette, France, and CEA, DEN, Valrho BP 17171, 30207 Bagnols sur Ceze, France
| | - Jean Aupiais
- CEA, DAM, DIF F-91297 Arpajon, France, CEA, DEN, Saclay, F-91191 Gif-sur-Yvette, France, and CEA, DEN, Valrho BP 17171, 30207 Bagnols sur Ceze, France
| | - Nicolas Baglan
- CEA, DAM, DIF F-91297 Arpajon, France, CEA, DEN, Saclay, F-91191 Gif-sur-Yvette, France, and CEA, DEN, Valrho BP 17171, 30207 Bagnols sur Ceze, France
| | - Thomas Vercouter
- CEA, DAM, DIF F-91297 Arpajon, France, CEA, DEN, Saclay, F-91191 Gif-sur-Yvette, France, and CEA, DEN, Valrho BP 17171, 30207 Bagnols sur Ceze, France
| | - Pierre Vitorge
- CEA, DAM, DIF F-91297 Arpajon, France, CEA, DEN, Saclay, F-91191 Gif-sur-Yvette, France, and CEA, DEN, Valrho BP 17171, 30207 Bagnols sur Ceze, France
| | - Philippe Moisy
- CEA, DAM, DIF F-91297 Arpajon, France, CEA, DEN, Saclay, F-91191 Gif-sur-Yvette, France, and CEA, DEN, Valrho BP 17171, 30207 Bagnols sur Ceze, France
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31
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Tsushima S. Quantum Chemical Calculations of the Redox Potential of the Pu(VII)/Pu(VIII) Couple. J Phys Chem B 2008; 112:13059-63. [DOI: 10.1021/jp804856z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Satoru Tsushima
- Institut für Radiochemie, Forschungszentrum Dresden-Rossendorf (FZD), P.O. Box 510119, Dresden, D-01314, Germany
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32
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Siboulet B, Marsden CJ, Vitorge P. What can quantum chemistry tell us about Pa(v) hydration and hydrolysis? NEW J CHEM 2008. [DOI: 10.1039/b806407e] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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33
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Combining theoretical chemistry and XANES multi-edge experiments to probe actinide valence states. CR CHIM 2007. [DOI: 10.1016/j.crci.2006.12.012] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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34
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Hennig C, Schmeide K, Brendler V, Moll H, Tsushima S, Scheinost AC. EXAFS Investigation of U(VI), U(IV), and Th(IV) Sulfato Complexes in Aqueous Solution. Inorg Chem 2007; 46:5882-92. [PMID: 17580931 DOI: 10.1021/ic0619759] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The local structure of U(VI), U(IV), and Th(IV) sulfato complexes in aqueous solution was investigated by U-L(3) and Th-L(3) EXAFS spectroscopy for total sulfate concentrations 0.05 < or = [SO(4)(2-)] < or = 3 M and 1.0 < or = pH < or = 2.6. The sulfate coordination was derived from U-S and Th-S distances and coordination numbers. The spectroscopic results were combined with thermodynamic speciation and density functional theory (DFT) calculations. In equimolar [SO(4)(2-)]/[UO(2)(2+)] solution, a U-S distance of 3.57 +/- 0.02 Angstrom suggests monodentate coordination, in line with UO(2)SO(4)(aq) as the dominant species. With increasing [SO(4)(2-)]/[UO(2)(2+)] ratio, an additional U-S distance of 3.11 +/- 0.02 Angstrom appears, suggesting bidentate coordination in line with the predominance of the UO(2)(SO(4))(2)(2-) species. The sulfate coordination of Th(IV) and U(IV) was investigated at [SO(4)(2-)]/[M(IV)] ratios > or = 8. The Th(IV) sulfato complex comprises both, monodentate and bidentate coordination, with Th-S distances of 3.81 +/- 0.02 and 3.14 +/- 0.02 Angstrom, respectively. A similar coordination is obtained for U(IV) sulfato complexes at pH 1 with monodentate and bidentate U-S distances of 3.67 +/- 0.02 and 3.08 +/- 0.02 Angstrom, respectively. By increasing the pH value to 2, a U(IV) sulfate precipitates. This precipitate shows only a U-S distance of 3.67 +/- 0.02 Angstrom in line with a monodentate linkage between U(IV) and sulfate. Previous controversially discussed observations of either monodentate or bidentate sulfate coordination in aqueous solutions can now be explained by differences of the [SO(4)(2-)]/[M] ratio. At low [SO(4)(2-)]/[M] ratios, the monodentate coordination prevails, and bidentate coordination becomes important only at higher ratios.
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Affiliation(s)
- Christoph Hennig
- Forschungszentrum Dresden-Rossendorf, Institute of Radiochemistry, P.O. Box 510119, 01314 Dresden, Germany.
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35
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Ikeda A, Hennig C, Tsushima S, Takao K, Ikeda Y, Scheinost AC, Bernhard G. Comparative Study of Uranyl(VI) and -(V) Carbonato Complexes in an Aqueous Solution. Inorg Chem 2007; 46:4212-9. [PMID: 17417836 DOI: 10.1021/ic070051y] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electrochemical, complexation, and electronic properties of uranyl(VI) and -(V) carbonato complexes in an aqueous Na2CO3 solution have been investigated to define the appropriate conditions for preparing pure uranyl(V) samples and to understand the difference in coordination character between UO22+ and UO2+. Cyclic voltammetry using three different working electrodes of platinum, gold, and glassy carbon has suggested that the electrochemical reaction of uranyl(VI) carbonate species proceeds quasi-reversibly. Electrolysis of UO22+ has been performed in Na2CO3 solutions of more than 0.8 M with a limited pH range of 11.7 < pH < 12.0 using a platinum mesh electrode. It produces a high purity of the uranyl(V) carbonate solution, which has been confirmed to be stable for at least 2 weeks in a sealed glass cuvette. Extended X-ray absorption fine structure (EXAFS) measurements revealed the structural arrangement of uranyl(VI) and -(V) tricarbonato complexes, [UO2(CO3)3]n- [n = 4 for uranyl(VI), 5 for uranyl(V)]. The bond distances of U-Oax, U-Oeq, U-C, and U-Odist are determined to be 1.81, 2.44, 2.92, and 4.17 A for the uranyl(VI) complex and 1.91, 2.50, 2.93, and 4.23 A for the uranyl(V) complex, respectively. The validity of the structural parameters obtained from EXAFS has been supported by quantum chemical calculations for the uranyl(VI) complex. The uranium LI- and LIII-edge X-ray absorption near-edge structure spectra have been interpreted in terms of electron transitions and multiple-scattering features.
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Affiliation(s)
- Atsushi Ikeda
- Forschungszentrum Dresden-Rossendorf (FZD), Institute of Radiochemistry, P.O. Box 510119, 01314 Dresden, Germany.
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36
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Toraishi T, Tsuneda T, Tanaka S. Theoretical Study on Molecular Property of Protactinium(V) and Uranium(VI) Oxocations: Why Does Protactinium(V) Form Monooxo Cations in Aqueous Solution? J Phys Chem A 2006; 110:13303-9. [PMID: 17149850 DOI: 10.1021/jp0641435] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stability of Pa(V) and U(VI) oxocations in aqueous solution were theoretically investigated by means of density functional theory calculations. As a result, the present calculations clearly supported an experimental result from an energetic point of view that monooxo protactinyl cation, PaO3+, is a preferable species for Pa(V) in aqueous solution, although dioxo protactinyl cation, PaO2+, is not a feasible form. By an analysis of molecular orbitals, we revealed that 6d orbitals of Pa(V) destabilize the pi orbitals of PaO2+, because 6d-2p antibonding orbital conflicts with another 5f-2p bonding orbital. For stable dioxo uranyl cation, UO2(2+), we found that 6d orbitals of U(VI), in contrast, form a bonding orbital with the 2p orbitals, and this bonding orbital coexists at an angle with the 5f-2p bonding orbital due to an electron correlation.
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Affiliation(s)
- Takashi Toraishi
- Department of Quantum Engineering and Systems Science, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
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