1
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Xu L, Zhao XK, Cao H, Hu HS, Li J, Chen J, Xu C. Complexation of Hexavalent Neptunium(VI) with Oxydiacetic Acid and Its Amide Derivatives in Aqueous Solution: Spectrophotometry and DFT Calculations. Inorg Chem 2024; 63:6173-6183. [PMID: 38530927 DOI: 10.1021/acs.inorgchem.3c04221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
Unfolding the solution coordination chemistry of high-valent transuranium elements with the "CHON"-type ligands is important to understand the fundamental chemistry of actinides and to design more efficient extractants for partitioning of transuranium elements in advanced nuclear fuel cycles. Here, the complexation of a hexavalent neptunyl ion (NpO22+ or Np(VI)) with oxydiacetic acid (ODA) has been systematically investigated in comparison with its amide analogues N,N-dimethyl-3-oxa-glutaramic acid (DMOGA) and N,N,N',N'-tetramethyl-3-oxa-glutaramide (TMOGA) both experimentally and computationally. The formation of both 1:1 and 1:2 complexes between Np(VI) and the three ligands was identified by spectrophotometry, and their stability constants were obtained and compared with those of hexavalent U(VI) and Pu(VI). The corresponding bonding nature is elucidated by using energy decomposition analysis (EDA), electrostatic potential (ESP), ELF contours, and natural orbitals for chemical valence (NOCV) methods, which shows that the Np-O bonds are essentially ionic in character and the unoccupied 6d orbitals of Np play a key role in enhancing the covalent interactions between Np(VI) and the three ligands.
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Affiliation(s)
- Lei Xu
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
- Institute of Nuclear Agricultural Science, Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, Zhejiang University, Hangzhou 310058, China
| | - Xiao-Kun Zhao
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Hong Cao
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Han-Shi Hu
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Jun Li
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Jing Chen
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Chao Xu
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
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2
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Xu C, Liu T, Liu Q, Yang S, Li D, Tian G. Complexation of Am(III) and Eu(III) with DRAPA ( N, N-dialkyl-6-amide-pyridine-2-carboxylic acid). Dalton Trans 2023; 52:15669-15671. [PMID: 37667654 DOI: 10.1039/d3dt02319b] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/06/2023]
Abstract
The similarity of the coordination chemistry of Am(III) and Eu(III) and two homologous tridentate ligands, N,N-di-2-ethylhexyl-6-amide-pyridine-2-carboxylic acid (DEHAPA, HL') in solvent extraction and N,N-dimethyl-6-amide-pyridine-2-carboxylic acid (DMAPA, HL) in aqueous solution and in the solid state, is revealed structurally and spectroscopically with complexes ML'3 (org), ML3 (aq) and ML3 (s), respectively.
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Affiliation(s)
- Chao Xu
- College of Nuclear Science and Technology, Harbin Engineering University, Harbin, Heilongjiang 150001, China.
| | - Tingting Liu
- College of Nuclear Science and Technology, Harbin Engineering University, Harbin, Heilongjiang 150001, China.
- Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China.
| | - Qian Liu
- Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China.
| | - Suliang Yang
- Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China.
| | - Dingming Li
- Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China.
| | - Guoxin Tian
- College of Nuclear Science and Technology, Harbin Engineering University, Harbin, Heilongjiang 150001, China.
- Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China.
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3
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Guo Y, Liu H, Cao H, Dong X, Wang Z, Chen J, Xu C. Complexation of uranyl with benzoic acid in aqueous solution at variable temperatures: potentiometry, spectrophotometry and DFT calculations. Dalton Trans 2023; 52:11265-11271. [PMID: 37526577 DOI: 10.1039/d3dt01896b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
Investigation of the fundamental coordination chemistry between U(VI) and simple organic ligands is important to understand the chemical behavior of U(VI) in the natural environment and separation processes. In this work, the complexation of U(VI) with a common carboxylic acid, benzoic acid, has been systematically investigated through potentiometry, spectrometry and DFT calculations. Three successive complexes (UO2L+, UO2L2 and UO2L3-, L = benzoate ion) between U(VI) and benzoic acid are successfully identified in aqueous solution and their corresponding thermodynamic parameters (stability constant, enthalpy and entropy) are determined. Notably, this is the first time that the previously missing 1 : 2 and 1 : 3 (U to L) complexes in aqueous solution and their complexation thermodynamics have been reported, which would aid in more accurate prediction of the chemical behavior of U(VI) in the presence of benzoic acid. Moreover, the structures of the complexes are elucidated using DFT calculations, which show that benzoic acid coordinates to U(VI) in a bidentate form in all the complexes.
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Affiliation(s)
- Yuxiao Guo
- Institute of Nuclear and New Energy Technology, Tsinghua University, 100084, Beijing, China.
| | - Haiwang Liu
- Institute of Nuclear and New Energy Technology, Tsinghua University, 100084, Beijing, China.
| | - Hong Cao
- Institute of Nuclear and New Energy Technology, Tsinghua University, 100084, Beijing, China.
| | - Xue Dong
- Institute of Nuclear and New Energy Technology, Tsinghua University, 100084, Beijing, China.
| | - Zhipeng Wang
- Institute of Nuclear and New Energy Technology, Tsinghua University, 100084, Beijing, China.
| | - Jing Chen
- Institute of Nuclear and New Energy Technology, Tsinghua University, 100084, Beijing, China.
| | - Chao Xu
- Institute of Nuclear and New Energy Technology, Tsinghua University, 100084, Beijing, China.
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4
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Xu C, Zhu L, Liu Q, Yang S, Xue Y, Tian G. A study on the extraction of actinides with a novel carboxylic acid extractant. J Radioanal Nucl Chem 2023. [DOI: 10.1007/s10967-022-08706-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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5
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Dong X, Yan Q, Wang Z, Feng X, Chen J, Xu C. Group Separation of Hexavalent Actinides from Lanthanides through Selective Extraction by Sterically Hindered 2-Ethylhexyl Phosphonic Acid Mono-2-ethylhexyl Ester. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c03337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xue Dong
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
| | - Qiang Yan
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
| | - Zhipeng Wang
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
| | - Xiaogui Feng
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
| | - Jing Chen
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
| | - Chao Xu
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
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6
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Zhang WJ, Wang C, Wang K, Zhang P, Hu SX. The stability and chemical bonding of a series tridentate ligand-actinyl complexes: [AnO2(L)2]2+ (An: U and Am). J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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7
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Chardi KJ, Satpathy A, Schenkeveld WDC, Kumar N, Noël V, Kraemer SM, Giammar DE. Ligand-Induced U Mobilization from Chemogenic Uraninite and Biogenic Noncrystalline U(IV) under Anoxic Conditions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:6369-6379. [PMID: 35522992 PMCID: PMC9118557 DOI: 10.1021/acs.est.1c07919] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 04/26/2022] [Accepted: 04/27/2022] [Indexed: 06/14/2023]
Abstract
Microbial reduction of soluble hexavalent uranium (U(VI)) to sparingly soluble tetravalent uranium (U(IV)) has been explored as an in situ strategy to immobilize U. Organic ligands might pose a potential hindrance to the success of such remediation efforts. In the current study, a set of structurally diverse organic ligands were shown to enhance the dissolution of crystalline uraninite (UO2) for a wide range of ligand concentrations under anoxic conditions at pH 7.0. Comparisons were made to ligand-induced U mobilization from noncrystalline U(IV). For both U phases, aqueous U concentrations remained low in the absence of organic ligands (<25 nM for UO2; 300 nM for noncrystalline U(IV)). The tested organic ligands (2,6-pyridinedicarboxylic acid (DPA), desferrioxamine B (DFOB), N,N'-di(2-hydroxybenzyl)ethylene-diamine-N,N'-diacetic acid (HBED), and citrate) enhanced U mobilization to varying extents. Over 45 days, the ligands mobilized only up to 0.3% of the 370 μM UO2, while a much larger extent of the 300 μM of biomass-bound noncrystalline U(IV) was mobilized (up to 57%) within only 2 days (>500 times more U mobilization). This work shows the potential of numerous organic ligands present in the environment to mobilize both recalcitrant and labile U forms under anoxic conditions to hazardous levels and, in doing so, undermine the stability of immobilized U(IV) sources.
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Affiliation(s)
- Kyle J. Chardi
- Centre
for Microbiology and Environmental Systems Science, Department for
Environmental Geosciences, University of
Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, Austria
| | - Anshuman Satpathy
- Department
of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Note Dame, Indiana 46556, United States
| | - Walter D. C. Schenkeveld
- Soil
Chemistry and Chemical Soil Quality Group, Wageningen University and Research, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands
| | - Naresh Kumar
- Soil
Chemistry and Chemical Soil Quality Group, Wageningen University and Research, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands
| | - Vincent Noël
- Stanford
Synchrotron Radiation Lightsource, SLAC
National Accelerator Laboratory, 2575 Sand Hill Road, Menlo
Park, California 94025, United States
| | - Stephan M. Kraemer
- Centre
for Microbiology and Environmental Systems Science, Department for
Environmental Geosciences, University of
Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, Austria
| | - Daniel E. Giammar
- Department
of Energy, Environmental, and Chemical Engineering, Washington University, One Brookings Drive, St. Louis, Missouri 63130, United
States
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8
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Cao H, Wei P, Pu N, Zhang Y, Yang Y, Wang Z, Sun T, Chen J, Xu C. Probing the Difference in the Complexation of Trivalent Actinides and Lanthanides with a Tridentate N,O-Hybrid Ligand: Spectroscopy, Thermodynamics, and Coordination Modes. Inorg Chem 2022; 61:6063-6072. [PMID: 35420792 DOI: 10.1021/acs.inorgchem.2c00114] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Comparatively revealing the complexation behavior of trivalent actinides and lanthanides with functional ligands in aqueous solution is of great importance to enrich our knowledge on the fundamental coordination chemistry of trivalent f-block elements and to control the fate of minor actinides in nuclear fuel cycles. In this work, the complexation of Am(III) and Nd(III), representatives for trivalent actinides and lanthanides, respectively, with a N,O-hybrid ligand 6-(dimethylcarbamoyl)picolinic acid (DMAPA, denoted as HL) was investigated by absorption spectroscopy, calorimetry, X-ray crystallography, and density functional theory (DFT) calculations. Successive formation of 1:1, 1:2, and 1:3 (metal/ligand) complexes of Am(III) and Nd(III) with DMAPA was identified, and the corresponding thermodynamic parameters were determined. The binding strength of Am(III) with DMAPA is slightly stronger than that of Nd(III), and the complexation of Nd(III) with DMAPA is mainly entropy-driven. The crystal structure of the 1:2 Nd(III)/DMAPA complex and the DFT calculation shed additional light on the coordination and structural characteristics of the complexes. In contrast to the Nd-N bond in the Nd(III)/DMAPA complex, the Am-N bond in the Am(III)/DMAPA complex exhibits more covalency, which contributes to the slightly stronger complexation of Am(III) with DMAPA.
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Affiliation(s)
- Hong Cao
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Pingping Wei
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Ning Pu
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Yusheng Zhang
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Yanqiu Yang
- Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, Sichuan 621900, China
| | - Zhipeng Wang
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Taoxiang Sun
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Jing Chen
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Chao Xu
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
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9
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Sun M, Xu L, Yang X, Wang S, Lei L, Xiao C. Complexation Behaviors of a Tridentate Phenanthroline Carboxamide Ligand with Trivalent f-Block Elements in Different Anion Systems: A Thermodynamic and Crystallographic Perspective. Inorg Chem 2022; 61:2824-2834. [PMID: 35104133 DOI: 10.1021/acs.inorgchem.1c03270] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The counteranion has a strong influence on the complexation behavior of tridentate phenanthroline carboxamide ligands with actinides and lanthanides, but the thermodynamic and underlying interaction mechanism at the molecular level is still not clear. In this work, a tridentate ligand, N-ethyl-N-tolyl-2-amide-1,10-phenanthroline (Et-Tol-PTA), was synthesized, and the effects of different anions (Cl-, NO3-, and ClO4-) on the complexation behavior of Et-Tol-PTA with typical lanthanides were thoroughly studied by using 1H nuclear magnetic resonance (NMR) spectroscopy, ultraviolet-visible (UV-vis) spectrophotometry, and single-crystal X-ray diffraction. The NMR spectroscopic titration of Lu(III) showed that there were three species (1:1, 2:1, and 3:1 ligand-metal complexes) formed in Cl- solution systems while two species (2:1 and 1:1) were formed in NO3- and ClO4- solution systems. When Et-Tol-PTA was titrated with La(III), two species (2:1 and 1:1) were formed in NO3- systems and only one species (1:1) was formed in Cl- and ClO4- systems. In addition, the stability constant was determined via UV-vis spectroscopic titration, which showed that the complexation strength between Et-Tol-PTA and Eu(III) decreased in the following order: ClO4- > NO3- > Cl-. This indicated that Et-Tol-PTA had the strongest complexation ability with Eu(III) in the ClO4- system. The structures of Et-Tol-PTA complexed with EuCl3, Eu(NO3)3, and Eu(ClO4)3 were further elucidated by single-crystal X-ray diffraction and agreed well with the results of UV-vis titration experiments. The results of this work revealed that the mechanisms of complexation of lanthanides with the asymmetric ligand Et-Tol-PTA were strongly affected by different anionic environments in solution and in the solid state. These findings may lead to the improvement of the separation of trivalent actinides and lanthanides in nuclear waste.
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Affiliation(s)
- Mingze Sun
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Lei Xu
- Institute of Nuclear Agricultural Sciences, Key Laboratory of Nuclear Agricultural Sciences of Ministry of Agriculture and Zhejiang Province, Zhejiang University, Hangzhou 310058, China
| | - Xiao Yang
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Shihui Wang
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Lecheng Lei
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Chengliang Xiao
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
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10
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Zhao XK, Cao CS, Liu JC, Lu JB, Li J, Hu HS. Theoretical Prediction of Graphene-like 2D Uranyl Material with p-Orbital Antiferromagnetism. Chem Sci 2022; 13:8518-8525. [PMID: 35974750 PMCID: PMC9337721 DOI: 10.1039/d2sc02017c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 05/23/2022] [Indexed: 11/21/2022] Open
Abstract
Versatile graphene-like two-dimensional materials with s-, p- and d-block elements have aroused significant interests because of their extensive applications while there is a lack of f-block one. Herein we report...
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Affiliation(s)
- Xiao-Kun Zhao
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University Beijing 100084 China
| | - Chang-Su Cao
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University Beijing 100084 China
| | - Jin-Cheng Liu
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University Beijing 100084 China
| | - Jun-Bo Lu
- Department of Chemistry, Southern University of Science and Technology Shenzhen 518055 China
| | - Jun Li
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University Beijing 100084 China
- Department of Chemistry, Southern University of Science and Technology Shenzhen 518055 China
| | - Han-Shi Hu
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University Beijing 100084 China
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11
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Cai Y, Yan Q, Wang M, Chen J, Fu H, Ye J, Conradson SD, Yuan L, Xu C, Feng W. Endowing 2,6-bis-triazolyl-pyridine of poor extraction with superior efficiency for actinide/lanthanide separation at high acidity by anchoring to a macrocyclic scaffold. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:125745. [PMID: 33866294 DOI: 10.1016/j.jhazmat.2021.125745] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 03/13/2021] [Accepted: 03/22/2021] [Indexed: 06/12/2023]
Abstract
Exploring nitrogen-containing extractants for recovering hazardous minor actinides that are workable in solutions of high acidity has been a challenge in nuclear waste treatment. Herein, we report our findings that 2,6-bis-triazolyl-pyridine (PyTri), which is ineffective as a hydrophobic ligand for minor actinide separation, turns into an excellent extractant that exhibits unexpectedly high efficiency and selectivity (SFAm/Eu = 172, 1 M HNO3) when attaching to pillar[5]arene platform. Surprisingly, the distribution ratio of Am(III) (DAm) is 4300 times higher than that of the acyclic PyTri ligand. The solvent extraction performance of this pillar[5]arene-achored PyTri not only far exceeds the best known pillar[5]arene ligands reported to date, but also stays comparable to other reported outstanding extractants. Slope analysis indicates that each P[5]A-PyTri can bind two metal ions, which is further corroborated by spectroscopic characterizations. Thermodynamic studies imply that the extraction process is exothermic and spontaneous in nature. Complexation investigation via EXAFS technique and DFT calculations strongly suggest that each Eu(III) ion is coordinated to three PyTri arms through a nine-coordination mode. This work provides a N-donor extractant that can operate at high acidity for minor actinide partitioning and implicates a promising approach for transforming poor extractants into superior ones.
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Affiliation(s)
- Yimin Cai
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Qiang Yan
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Mengxin Wang
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Jing Chen
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Haiying Fu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - Jiawei Ye
- Irradiation Preservation Technology Key Laboratory of Sichuan Province, Chengdu 610101, China
| | - Steven D Conradson
- Department of Complex Matter, Jozef Stefan Institute, 1000 Ljubljana, Slovenia; Department of Chemistry, Washington State University, Pullman, WA 99164, USA
| | - Lihua Yuan
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Chao Xu
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.
| | - Wen Feng
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China.
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12
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Yang XF, Ren P, Yang Q, Geng JS, Zhang JY, Yuan LY, Tang HB, Chai ZF, Shi WQ. Strong Periodic Tendency of Trivalent Lanthanides Coordinated with a Phenanthroline-Based Ligand: Cascade Countercurrent Extraction, Spectroscopy, and Crystallography. Inorg Chem 2021; 60:9745-9756. [PMID: 34115461 DOI: 10.1021/acs.inorgchem.1c01035] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Phenanthroline-diamide ligands have been reported in the selective separation of actinides over Eu(III); on the contrary, relevant basic coordination chemistry studies are still limited, and extraction under actual application conditions is rarely involved. In this work, N,N'-diethyl-N,N'-ditolyl-2,9-diamide-1,10-phenanthroline [Et-Tol-DAPhen (L)] was applied to explore the coordination performance of lanthanides in simulative high-level liquid waste. For the first time, cascade countercurrent extraction was conducted with Et-Tol-DAPhen as the extractant, which reveals the periodic tendency of the extraction efficiency of lanthanides to decrease gradually as the atomic number increases. Comparison of elements with similar radii verifies the hypothesis that the increase in the atomic number leads to a decrease in the ionic radius, thus reducing the coordination and extraction capacity of ligands. Slope analysis, electrospray ionization mass spectrometry, and ultraviolet-visible titration results show that the ligand forms 1:1 and 1:2 complexes with lanthanides and the coordination ability follows the tendency of extraction efficiency, and the first crystal structures of Lns(III) with a phenanthroline-diamide ligand, i.e., [LaL(NO3)3(H2O)] and [LaL2(NO3)2][(NO3)], were obtained, which confirms the conclusions described above. This work promises to enhance our comprehension of the chemical properties of Lns(III) and offer new clues for the design and synthesis of novel separation ligands.
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Affiliation(s)
- Xiao-Fan Yang
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.,Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China
| | - Peng Ren
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.,School of Nuclear Science and Engineering, East China University of Technology, Nanchang, Jiangxi 330013, China
| | - Qi Yang
- Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China
| | - Jun-Shan Geng
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Jin-Yu Zhang
- Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China
| | - Li-Yong Yuan
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Hong-Bin Tang
- Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China
| | - Zhi-Fang Chai
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.,Engineer Laboratory of Advanced Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China
| | - Wei-Qun Shi
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
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13
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Cai Y, Ansari SA, Fu K, Zhu B, Ma H, Chen L, Conradson SD, Qin S, Fu H, Mohapatra PK, Yuan L, Feng W. Highly efficient actinide(III)/lanthanide(III) separation by novel pillar[5]arene-based picolinamide ligands: A study on synthesis, solvent extraction and complexation. JOURNAL OF HAZARDOUS MATERIALS 2021; 405:124214. [PMID: 33129604 DOI: 10.1016/j.jhazmat.2020.124214] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 09/30/2020] [Accepted: 10/05/2020] [Indexed: 06/11/2023]
Abstract
Selective extraction of highly radiotoxic actinides(III) is an important and challenging task in nuclear wastewater treatment. Many proposed ligands containing S or P atoms have drawbacks including high reagent consumption and possible secondary pollution after incineration. The present work reports five novel pillar[5]arene-based extractants that are anchored with picolinamide substituents of different electronic nature by varying spacer. These ligands reveal highly efficient separation of actinides(III) over lanthanides(III). Specifically, almost all of these ligands could extract Am(III) over Eu(III) selectively at around pH 3.0 (SFAm/Eu>11) with fast extraction kinetics. Variation of the pyridine nitrogen basicity via changing para-substitution leads to an increase in the distribution ratios by a factor of over 300 times for Am(III) with an electron-withdrawing group compared to those with an electron donating group. Investigation of complexation mechanism by slope analysis, NMR, IR, EXAFS, and DFT techniques indicates that each ligand binds two metal ions by pyridine nitrogen and amide oxygen. Finally, these ligands do not show obvious decrease in both extraction and separation ability after being exposed to 250 kGy absorbed gamma radiation. These results demonstrate the potential application of pillar[5]arene-picolinamides for actinide(III) separation.
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Affiliation(s)
- Yimin Cai
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Seraj A Ansari
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Kuirong Fu
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Beichen Zhu
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Haoyang Ma
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Lixi Chen
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Steven D Conradson
- Department of Complex Matter, Jozef Stefan Institute, 1000 Ljubljana, Slovenia; Department of Chemistry, Washington State University, Pullman, WA 99164, USA
| | - Song Qin
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Haiying Fu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - Prasanta K Mohapatra
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
| | - Lihua Yuan
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Wen Feng
- Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China.
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14
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Zhang WJ, Wang GJ, Zhang P, Zou W, Hu SX. The decisive role of 4f-covalency in the structural direction and oxidation state of XPrO compounds (X: group 13 to 17 elements). Phys Chem Chem Phys 2020; 22:27746-27756. [PMID: 33242323 DOI: 10.1039/d0cp04700g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Lanthanide oxo compounds are of vital importance in lanthanide chemistry, as well as in environmental and materials sciences. Praseodymium, as an exceptional element in lanthanides which can form a +V formal oxidation state (OSf) besides the dominant +III among the 4f-block element, displays the significant participation of the Pr 4f orbitals in bonding interactions which is commonly crucial in stabilizing the high oxidation state of Pr in PrO2+ and NPrO species. Here, we report a systematic theoretical study on the structures and stabilities of a series of XPrO (X: B, Al, C, Si, N, P, As, O, S, F, Cl) compounds along with [XPrO]+ cation (X: O, S) and [X3PrO] complexes (X: F and Cl). This work reveals that Pr is able to achieve the lowest and highest OSf and the OSf exhibits periodic variation from +I in BOPr and AlOPr to +II in SiOPr to +III in CPrO, FPrO, ClPrO and AsPrO to +IV in OPrO and SPrO and even to +V in NPrO, [OPrO]+, [SPrO]+, F3PrO and Cl3PrO. We found that the molecular structures are correlated to the Pr oxidation state due to the highly important 4f orbital in the chemical bonding of the high oxidation state compounds. Thus, not only the electronegativity of the ligand but also the quasi-degenerate Pr valence 4f orbitals, namely energetic covalency, control the oxidation state and play a fundamental role in affecting the electronic structural stability of Pr(v) compounds as well. This work demonstrates the structurally directing role of the f-orbital in the formation of the linear structure and is constructive for achieving the higher oxidation state of a given element by tuning the ligand.
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Affiliation(s)
- Wen-Jing Zhang
- Beijing Computational Science Research Center, Beijing 100193, China.
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