1
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Chen YM, Wang CZ, Zhang L, Wu QY, Lan JH, Chai ZF, Shi WQ. Theoretical insights into selective extraction of Am(III) from Cm(III) and Eu(III) with asymmetric N-heterocyclic ligands. Dalton Trans 2024; 53:7406-7413. [PMID: 38587851 DOI: 10.1039/d3dt03965j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Separation of lanthanide (Ln) and minor actinide (MA) elements and mutual separation between minor actinide elements (e.g. Am(III) and Cm(III)) represent a crucial undertaking. However, separating these elements poses a significant challenge owing to their highly similar physicochemical properties. Asymmetric N-heterocyclic ligands such as N-ethyl-6-(1H-pyrazol-3-yl)-N-(p-tolyl)picolinamide (Et-p-Tol-A-PzPy) and N-ethyl-N-(p-tolyl)-1,10-phenanthroline-2-carboxamide (ETPhenAm) have recently received considerable attention in the separation of MAs over Ln from acid solutions. By changing the central skeleton structures of these ligands and introducing substituents with different properties on the side chains, their complexation behavior with Am(III), Cm(III), and Eu(III) may be affected. In this work, we explore four different asymmetric N-containing heterocyclic ligands, namely Et-p-Tol-A-PzPy (L1), N-ethyl-6'-(1H-pyrazol-3-yl)-N-(p-tolyl)-[2,2'-bipyridine]-6-carboxamide (L2), N-ethyl-9-(1H-pyrazol-3-yl)-N-(p-tolyl)-1,10-phenanthroline-2-carboxamide (L3), and ETPhenAm (L4) using density functional theory (DFT). The calculated results demonstrate the potential of ligands L1-L4 for the extraction and separation of Am(III), Cm(III), and Eu(III). Ligand analysis shows that ligand L3 binds more easily to the central metal atom, in line with the stronger extraction capacity of L3. In spite of the higher covalence between the side chain and the central metal atom for complexes with L1-L3, the main chain seems to control the stability of the extraction complexes. The preorganized 1,10-phenanthroline backbone also further enhances the extraction performance of L3 and L4. The difference in coordination ability between the side chain donors of these ligands and metal ions may affect their separation efficiency. This work presents theoretical insights into synthesizing novel ligands for separating trivalent actinides by adjusting N-heterocyclic ligands.
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Affiliation(s)
- Yan-Mei Chen
- Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, China
| | - Cong-Zhi Wang
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
| | - Lei Zhang
- Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, China
| | - Qun-Yan Wu
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
| | - Jian-Hui Lan
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
| | - Zhi-Fang Chai
- Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, China
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, 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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2
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Konopkina EA, Pozdeev AS, Kalle P, Kirsanov DO, Smol'yanov NA, Kirsanova AA, Kalmykov SN, Petrov VG, Borisova NE, Matveev PI. Sensing and extraction of hazardous metals by di-phosphonates of heterocycles: a combined experimental and theoretical study. Dalton Trans 2023; 52:12934-12947. [PMID: 37646311 DOI: 10.1039/d3dt01534c] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
In this study, pyridine and phenanthroline diphosphonate ligands were investigated for the first time from the context of solvent extraction and potentiometric sensing of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Pb(II) cations. The extraction efficiency under the same conditions for phenanthroline-diphosphonates is considerably higher than that for pyridine ligands. At the same time, the pyridine-diphosphonates show pronounced selectivity towards lead in this metal series. The extraction systems with phenanthroline diphosphonates provided the most efficient extraction of Cd(II) and Pb(II) cations (D > 90). The newly developed pyridine and phenanthroline diphosphonate ligands have proven to be highly effective components in plasticized polymeric membranes. These ligands can be utilized to construct potentiometric ion sensors that exhibit a notable response specifically towards Pb(II) cations. Among the previously reported tetradentate ligands, the phenanthroline diphosphonate ligand, when incorporated into plasticized polymeric membranes, demonstrated the highest sensitivity towards d-metals and Pb(II). The structure of the single crystal complex of Pb(II) and Cd(II) with pyridine-diphosphonates was studied by X-ray diffraction analysis (XRD). The geometry of Cu(II), Zn(II), Cd(II) and Pb(II) complexes and the energy effect of the complex formation, including pseudo-oligomerization reactions, were determined by DFT calculations. The high sensing and extraction efficiency of diphosphonates with respect to Pb(II) is consistent with the minimum values of complex formation energies. The variation in sensory and extraction properties observed among the studied diphosphonate ligands is influenced by the ability to form polynuclear complexes with Pb(II) cations, whereas such properties are absent in the case of Cd(II) cations.
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Affiliation(s)
- Ekaterina A Konopkina
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russian Federation.
| | - Anton S Pozdeev
- Department of Chemistry and Biochemistry, Utah State University, 0300 Old Main Hill, Logan, UT, 84322-0300, USA
| | - Paulina Kalle
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Moscow, Russian Federation
| | - Dmitry O Kirsanov
- Institute of Chemistry, Saint-Petersburg State University, Saint-Petersburg, Russian Federation
- ITMO University, Saint-Petersburg, Russian Federation
| | | | - Anna A Kirsanova
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russian Federation.
| | - Stepan N Kalmykov
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russian Federation.
| | - Vladimir G Petrov
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russian Federation.
| | - Nataliya E Borisova
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russian Federation.
| | - Petr I Matveev
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russian Federation.
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3
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Tian D, Liu Y, Kang Y, Zhao Y, Li P, Xu C, Wang L. A Simple yet Efficient Hydrophilic Phenanthroline-Based Ligand for Selective Am(III) Separation under High Acidity. ACS CENTRAL SCIENCE 2023; 9:1642-1649. [PMID: 37637748 PMCID: PMC10451031 DOI: 10.1021/acscentsci.3c00504] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Indexed: 08/29/2023]
Abstract
Highly selective hydrophilic ligands were believed to be an efficient way to overcome the massive amount of hazardous organic solvent used in the liquid-liquid extraction process and stood as a new frontier in the Lns(III)/Ans(III) partition. Current reported hydrophilic ligands suffer from harsh preparation conditions, inferior extraction performances, limited available chemical structures, and inability to carry out extraction under high acidity. In this article, we report a simple yet efficient carboxylic group modified phenanthroline-diimide ligand which displayed unexpected Lns(III)/Ans(III) and Ans(III)/Ans(III) separation capabilities in 1.5 M HNO3. Unique dimeric architectures for Eu(III) complexes were observed, which could be the origin of the outperforming selectivity and acid resistance. We believe this crystal engineering approach could inspire a renaissance in searching for new functional groups and coordination modes for efficient, high-acid-tolerance Lns(III)/Ans(III) separation ligands.
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Affiliation(s)
- Deshun Tian
- Department
of Chemistry, Capital Normal University, Haidian District, Beijing 100048, People’s Republic
of China
- Institute
of Materials for Optoelectronics and New Energy, Hubei Key Laboratory
of Plasma Chemistry and Advanced Materials, School of Materials Science
and Engineering, Wuhan Institute of Technology, Wuhan, Hubei 430205, People’s
Republic of China
| | - Yaoyang Liu
- Institute
of Nuclear and New Energy Technology, Tsinghua
University, Haidian District, Beijing 100084, People’s Republic of China
| | - Yu Kang
- Department
of Chemistry, Capital Normal University, Haidian District, Beijing 100048, People’s Republic
of China
| | - Yue Zhao
- Department
of Chemistry, Capital Normal University, Haidian District, Beijing 100048, People’s Republic
of China
- CAS
Key Laboratory of Green Process and Engineering, State Key Laboratory
of Biochemical Engineering, Institute of
Process Engineering, Chinese Academy of Sciences, Haidian District, Beijing 100190, People’s Republic
of China
| | - Pengcheng Li
- Institute
of Materials for Optoelectronics and New Energy, Hubei Key Laboratory
of Plasma Chemistry and Advanced Materials, School of Materials Science
and Engineering, Wuhan Institute of Technology, Wuhan, Hubei 430205, People’s
Republic of China
| | - Chao Xu
- Institute
of Nuclear and New Energy Technology, Tsinghua
University, Haidian District, Beijing 100084, People’s Republic of China
| | - Li Wang
- Department
of Chemistry, Capital Normal University, Haidian District, Beijing 100048, People’s Republic
of China
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4
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Wang X, Song L, Yu Q, Li Q, He L, Xiao X, Pan Q, Yang Y, Ding S. Complexation of a Nitrilotriacetate-Derived Triamide Ligand with Trivalent Lanthanides: A Thermodynamic and Crystallographic Study. Inorg Chem 2023; 62:3916-3928. [PMID: 36821293 DOI: 10.1021/acs.inorgchem.2c04311] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Non-heterocyclic N-donor nitrilotriacetate-derived triamide ligands are one of the most promising extractants for the selective extraction separation of trivalent actinides over lanthanides, but the thermodynamics and mechanism of the complexation of this kind of ligand with actinides and lanthanides are still not clear. In this work, the complexation behaviors of N,N,N',N',N″,N″-hexaethylnitrilotriacetamide (NTAamide(Et)) with four representative trivalent lanthanides (La3+, Nd3+, Eu3+, and Lu3+) were systematically investigated by using 1H nuclear magnetic resonance (1H NMR), ultraviolet-visible (UV-vis) and fluorescence spectrophotometry, microcalorimetry, and single-crystal X-ray diffractometry. 1H NMR spectroscopic titration of La3+ and Lu3+ indicates that two species of 1:2 and 1:1 metal-ligand complexes were formed in NO3- and ClO4- media. The stability constants of NTAamide(Et) with Nd3+ and Eu3+ obtained by UV-vis and fluorescence titration show that the complexing strength of NTAamide(Et) with Nd3+ is lower than that with Eu3+ in the same anionic medium, while that of the same lanthanide complex is higher in ClO4- medium than in NO3- medium. Meanwhile, the formation reactions for all metal-ligand complexes are driven by both enthalpy and entropy. The structures of lanthanide complexes in the single ClO4- and NO3- medium and the mixed one were determined to be [LnL2(MeOH)](ClO4)3 (Ln = La, Nd, Eu, and Lu), [LaL2(EtOH)2][La(NO3)6], and [LaL2(NO3)](ClO4)2, separately. The average bond lengths of lanthanide complexes decrease gradually with the decrease in ionic radii of Ln3+, indicating that heavier lanthanides form stronger complexes due to the lanthanide contraction effect, which coincides with the trend of the complexing strength obtained by spectroscopic titration. This work not only reveals the thermodynamics and mechanism of the complexation between NTAamide ligands and lanthanides but also obtains the periodic tendency of complexation between them, which may facilitate the separation of trivalent lanthanides from actinides.
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Affiliation(s)
- Xueyu Wang
- College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Lianjun Song
- College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Qiao Yu
- College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Qiuju Li
- College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Lanlan He
- College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Xiao Xiao
- College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - Qingjiang Pan
- School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, P. R. China
| | - Yanqiu Yang
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, P. R. China
| | - Songdong Ding
- College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
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5
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Lei XP, Wu QY, Wang CZ, Lan JH, Chai ZF, Nie CM, Shi WQ. Theoretical Insights into the Substitution Effect of Phenanthroline Derivatives on Am(III)/Eu(III) Separation. Inorg Chem 2023; 62:2705-2714. [PMID: 36724403 DOI: 10.1021/acs.inorgchem.2c03823] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Separation of trivalent actinides (An(III)) and lanthanides (Ln(III)) poses a huge challenge in the reprocessing of spent nuclear fuel due to their similar chemical properties. N,N'-Diethyl-N,N'-ditolyl-2,9-diamide-1,10-phenanthroline (Et-Tol-DAPhen) is a potential ligand for the extraction of An(III) from Ln(III), while there are still few reports on the effect of its substituent including electron-withdrawing and electron-donating groups on An(III)/Ln(III) separation. Herein, the interaction of Et-Tol-DAPhen ligands modified by the electron-withdrawing groups (CF3, Br) and electron-donating groups (OH) with Am(III)/Eu(III) ions was investigated using scalar relativistic density functional theory (DFT). The analyses of bond order, quantum theory of atoms in molecules (QTAIM), and molecular orbital (MO) indicate that the substitution groups have a slight effect on the electronic structures of the [M(L-X)(NO3)3] (X = CF3, Br, OH) complexes. However, the thermodynamic results suggest that a ligand with the electron-donating group (L-OH) improves the extraction ability of metal ions, and the ligand modified by the electron-withdrawing group (L-Br) has the best Am(III)/Eu(III) selectivity. This work could render new insights into understanding the effect of electron-withdrawing and electron-donating groups in tuning the selectivity of Et-Tol-DAPhen derivatives and pave the way for designing new ligands modified by substituted groups with better extraction ability and An(III)/Ln(III) selectivity.
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Affiliation(s)
- Xia-Ping Lei
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China.,Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Qun-Yan Wu
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Cong-Zhi Wang
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Jian-Hui Lan
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Fang Chai
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Chang-Ming Nie
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, 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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6
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Wu S, Zhang Y, Li AY. Effects of Electron‐Withdrawing and ‐Donating Substituents in N‐Donor Scorpionate Ligands and the Metal 5
f
/4
f
Orbitals on Am(III)/Eu(III) Complexation and Separation. ChemistrySelect 2022. [DOI: 10.1002/slct.202203622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Shouqiang Wu
- School of Chemistry and Chemical Engineering Southwest University Chongqing 400715 P.R.China
| | - Yiying Zhang
- School of Chemistry and Chemical Engineering Southwest University Chongqing 400715 P.R.China
| | - An Yong Li
- School of Chemistry and Chemical Engineering Southwest University Chongqing 400715 P.R.China
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7
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Miao Y, Xu L, Yang X, Wang S, Zhang J, Xu C, Xiao C. Separation and Complexation of Trivalent Actinides and Lanthanides by Two Novel Asymmetric N,O-Hybrid Pyridyl Ligands: A Combination of Phosphoryl and Triazinyl Groups. Inorg Chem 2022; 61:17911-17923. [DOI: 10.1021/acs.inorgchem.2c03346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yujie Miao
- 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
| | - Jian Zhang
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Chao Xu
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Chengliang Xiao
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
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8
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Konopkina EA, Matveev PI, Huang PW, Kirsanova AA, Chernysheva MG, Sumyanova TB, Domnikov KS, Shi WQ, Kalmykov SN, Petrov VG, Borisova NE. Pyridine-di-phosphonates as chelators for trivalent f-elements: kinetics, thermodynamic and interfacial study of Am(III)/Eu(III) solvent extraction. Dalton Trans 2022; 51:11180-11192. [PMID: 35801576 DOI: 10.1039/d2dt01007k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The fractionation of high-level radioactive waste from nuclear power plants simplifies the handling of its components, and facilitates the reduction of radiotoxic effects on the environment. The search and study of new ligands for solvent extraction, as one of the methods in fractionation, remains a complex and important research task. In this work, four pyridine diphosphonate ligands were synthesized. These ligands are part of the class of the N,O-donor extractants, which are selective towards Am(III). The separation factor SF(Am/Eu) for the best extractant reached values up to 10. The influence of the substituents on the efficiency of extraction and complexation of trivalent f-elements, the kinetics of extraction, and the behavior of the ligand at the interface were described. The effect of nitric acid concentration on the extraction was shown. The stoichiometry of the complexes was determined by slope analysis in solvent extraction experiment and verified by spectrophotometric titration in acetonitrile. Liquid tension experiments with a pendant drop method revealed the interfacial properties of the ligands in "F-3 solvent/H2O" and "F-3 solvent/HNO3" systems. The relationship between the surface activity and the ligand structure was shown. Studies of the extraction kinetics were performed in a modified Lewis cell. The effect of the ligand structure on the extraction rate was shown. The DFT calculation with the B3LYP density functional was used to explain the extraction properties of the ligands, including selectivity. The calculation of the pre-organization energy of the ligands explained the kinetics and extraction patterns for the studied series.
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Affiliation(s)
- Ekaterina A Konopkina
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
| | - Petr I Matveev
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
| | - Pin-Wen Huang
- Zhejiang University of Water Resources and Electric Power, Hangzhou, 310018, China
| | - Anna A Kirsanova
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
| | - Maria G Chernysheva
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
| | - Tsagana B Sumyanova
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
| | - Kirill S Domnikov
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
| | - Wei-Qun Shi
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Stepan N Kalmykov
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
| | - Vladimir G Petrov
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
| | - Nataliya E Borisova
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
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9
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Novel phenanthroline-derived pyrrolidone ligands for efficient uranium separation: Liquid-liquid extraction, spectroscopy, and molecular simulations. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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10
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Ebenezer C, Solomon RV. Uptake of Am(III) Ions and Eu(III) Ions Using Cyclic Substituted N, O‐hybrid 1,10‐Phenanthroline Derived Phosphine Oxide Ligands ‐ A DFT Exploration. ChemistrySelect 2022. [DOI: 10.1002/slct.202200446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Cheriyan Ebenezer
- Department of Chemistry Madras Christian College (Autonomous) University of Madras, East Tambaram Chennai 600 059 Tamil Nadu India
| | - Rajadurai Vijay Solomon
- Department of Chemistry Madras Christian College (Autonomous) University of Madras, East Tambaram Chennai 600 059 Tamil Nadu India
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11
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Huang PW. Theoretical unraveling of the separation of trivalent Am and Eu ions by phosphine oxide ligands with different central heterocyclic moieties. Dalton Trans 2022; 51:7118-7126. [PMID: 35466979 DOI: 10.1039/d2dt00509c] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The treatment of nuclear spent fuels, especially the separation of minor actinides, is an imperative task for the healthy development of the nuclear industry. Up to now, it still remains a worldwide challenge to separate trivalent An3+ from Ln3+ because of their similar chemical properties. Therefore, investigating the mechanism behind the selective extraction of An3+ by theoretical methods is necessary. In this work, three phosphine oxide ligands with the same side structures but different bridging frameworks, Ph2PyPO, Ph2BipyPO and Ph2PhenPO, were investigated theoretically, and compared with each other using relativistic density functional theory. The results of QTAIM and MBO suggest that the Am-N bonds in the studied complexes have more covalent character than those in the Eu-N bonds, whereas the PDOS analysis indicates that more overlap exists between Am-5f and the Ph2PyPO's N-2p orbital than between Am-5f and Ph2BipyPO's N-2p, and Am-5f and Ph2PhenPO's N-2p orbital. However, the studied ligands all possess stronger affinities towards Am3+ than Eu3+, which partly results in the Am3+ selectivity towards Eu3+ in these three ligands. The calculated reaction free energy can reproduce the Am/Eu separation ability difference of three ligands well. This work offers some useful information for An/Ln separation of phosphine oxide ligands, and may help to design more efficient An3+/Ln3+ separation ligands.
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Affiliation(s)
- Pin-Wen Huang
- Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, People's Republic of China.
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12
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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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13
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Ebenezer C, Vijay Solomon R. Preorganization of N, O-hybrid phosphine oxide chelators for effective extraction of trivalent Am/Eu ions - A computational study. NEW J CHEM 2022. [DOI: 10.1039/d1nj06029e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N, O-hybrid phosphine oxide ligands with N-heterocyclic cores are the advanced extractants for extracting actinides over lanthanides. Yet, the challenging task in designing an efficient hybrid ligand is tracing the...
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Takeyama T, Takao K. Effects of coordinating heteroatoms on molecular structure, thermodynamic stability and redox behavior of uranyl( vi) complexes with pentadentate Schiff-base ligands. RSC Adv 2022; 12:24260-24268. [PMID: 36128519 PMCID: PMC9413499 DOI: 10.1039/d2ra04639c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 08/22/2022] [Indexed: 12/02/2022] Open
Abstract
Uranyl(vi) complexes with pentadentate N3O2-, N2O3- and N2O2S1-donating Schiff base ligands, tBu,MeO–saldien–X2− (X = NH, O and S), were synthesized and thoroughly characterized by 1H NMR, IR, elemental analysis, and single crystal X-ray diffraction. The crystal structures of UO2(tBu,MeO–saldien–X) showed that the U–X bond strength follows U–O ≈ U–NH > U–S. Conditional stability constants (βX) of UO2(tBu,MeO–saldien–X) in ethanol were investigated to understand the effect of X on thermodynamic stability. The log βX decrease in the order of UO2(tBu,MeO–saldien–NH) (log βNH = 10) > UO2(tBu,MeO–saldien–O) (log βO = 7.24) > UO2(tBu,MeO–saldien–S) (log βS = 5.2). This trend cannot be explained only by Pearson's Hard and Soft Acids and Bases (HSAB) principle, but rather follows the order of basicity of X. Theoretical calculations of UO2(tBu,MeO–saldien–X) suggested that the ionic character of U–X bonds decreases in the order of U–NH > U–O > U–S, while the covalency increases in the order U–O < U–NH < U–S. Redox potentials of all UO2(tBu,MeO–saldien–X) in DMSO were similar to each other regardless of the difference in X. Spectroelectrochemical measurements and DFT calculations revealed that the center U6+ of each UO2(tBu,MeO–saldien–X) undergoes one-electron reduction to afford the corresponding uranyl(v) complex. Consequently, the difference in X of UO2(tBu,MeO–saldien–X) affects the coordination of tBu,MeO–saldien–X2− with UO22+. However, the HSAB principle is not always prominent, but the Lewis basicity and balance between ionic and covalent characters of the U–X interactions are more relevant to determine the bond strengths. The U–X bond strength and thermodynamic stability of uranyl(vi) complexes with pentadentate N2O2X1-donating ligands (X = NH, O, S) are affected by the difference in X. In contrast, the X atom does not largely affect the redox behavior of the complexes.![]()
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Affiliation(s)
- Tomoyuki Takeyama
- Laboratory for Zero-Carbon Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1 N1-32, O-Okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Koichiro Takao
- Laboratory for Zero-Carbon Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1 N1-32, O-Okayama, Meguro-ku, Tokyo 152-8550, Japan
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Lei XP, Wu QY, Wang CZ, Lan JH, Chai ZF, Nie CM, Shi WQ. Theoretical insights into the separation of Am( iii)/Eu( iii): designing ligands based on a preorganization strategy. Dalton Trans 2022; 51:16659-16667. [DOI: 10.1039/d2dt02474h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The extraction behaviors of Am(iii) and Eu(iii) were investigated using phenanthroline and bipyridine ligands based on a preorganization strategy.
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Affiliation(s)
- Xia-Ping Lei
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China
| | - Qun-Yan Wu
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Cong-Zhi Wang
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Jian-Hui Lan
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhi-Fang Chai
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Chang-Ming Nie
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, 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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Yang X, Wang S, Xu L, Yan Q, Xu C, Matveev P, Lei L, Xiao C. New tetradentate N, O-hybrid phenanthroline-derived organophosphorus extractants for the separation and complexation of trivalent actinides and lanthanides. Inorg Chem Front 2022. [DOI: 10.1039/d2qi01153k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Comparison of the extraction and separation properties between two novel phenanthroline-derived organophosphorus ligands, Et-Ph-BPPhen and Et-Ph-PIPhen.
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Affiliation(s)
- 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
| | - Lei Xu
- Institute of Nuclear-Agricultural Science, Zhejiang University, Hangzhou 310058, China
| | - Qiang Yan
- 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
| | - Petr Matveev
- Radiochemistry Division, Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - 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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Does the length of the alkyl chain affect the complexation and selectivity of phenanthroline-derived phosphonate ligands? – Answers from DFT calculations. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115533] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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