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Kim HK, Cho H, Jeong K, Yoon UH, Cho HR. Thermodynamic Study of Am(III)–Isosaccharinate Complexation at Various Temperatures Implicating a Stepwise Reduction in Binding Denticity. Inorg Chem 2022; 61:19369-19378. [DOI: 10.1021/acs.inorgchem.2c03180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Hee-Kyung Kim
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon34057, Republic of Korea
| | - Hyejin Cho
- Radioactive Material Chemical Analysis Team, Korea Atomic Energy Research Institute, Daejeon34057, Republic of Korea
| | - Keunhong Jeong
- Department of Chemistry, Korea Military Academy, Seoul01805, Republic of Korea
| | - Ung Hwi Yoon
- Department of Chemistry, Korea Military Academy, Seoul01805, Republic of Korea
| | - Hye-Ryun Cho
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon34057, Republic of Korea
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Cusnir R, Froidevaux P, Carbonez P, Straub M. Solid-phase extraction of 225Ac using ion-imprinted resin and 243Am as a radioactive tracer for internal dosimetry and incorporation measurements. Anal Chim Acta 2022; 1194:339421. [DOI: 10.1016/j.aca.2021.339421] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/27/2021] [Accepted: 12/29/2021] [Indexed: 11/15/2022]
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Kim HK, Jeong K, Cho HR, Kwak K, Jung EC, Cha W. Study of Aqueous Am(III)-Aliphatic Dicarboxylate Complexes: Coordination Mode-Dependent Optical Property and Stability Changes. Inorg Chem 2020; 59:13912-13922. [PMID: 32946238 DOI: 10.1021/acs.inorgchem.0c01538] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The thermodynamics of Am(III) complex formation in natural groundwater systems is one of the major topics of research in the field of high-level radioactive waste management. In this study, we investigate the absorption and luminescence properties of aqueous Am(III) complexes with a series of aliphatic dicarboxylates in order to learn the thermodynamic complexation behaviors in relation to binding geometries. The formation of Am(III) complexes with these carboxylate ligands induced distinct red shifts in the absorption spectra, which enabled chemical speciation. The formation constants determined by deconvolution of the absorption spectra showed a linear decrease for the three ligands (oxalate (Ox), malonate (Mal), and succinate (Suc)) and a mild decrease for the remaining ligands (glutarate (Glu) and adipate (Adi)). Time-resolved laser fluorescence spectroscopy (TRLFS) was used to obtain information about the aqua ligand, which indirectly indicated the bidentate bindings of these dicarboxylate ligands. A complementary attenuated total reflectance Fourier transform infrared (ATR-FTIR) study on Eu(III), which is a nonradioactive analogue of Am(III) ion, showed that the coordination modes differ depending on the alkyl chain length. Ox and Mal bind to Am(III) via side-on bidentate bindings with two carboxylate groups, resulting in the formation of stable 5- and 6-membered ring structures, respectively. On the other hand, Suc, Glu, and Adi form end-on bidentate bindings with a single carboxylate group, resulting in a 4-membered ring structure. Density functional theory calculations provided details about the bonding properties and supported the experimentally proposed coordination geometries. This study demonstrates that coordination mode-dependent changes in optical properties occur along with thermodynamic stability changes in Am(III)-dicarboxylate complexes.
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Affiliation(s)
- Hee-Kyung Kim
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
| | - Keunhong Jeong
- Department of Chemistry, Korea Military Academy, Seoul 01805, Republic of Korea
| | - Hye-Ryun Cho
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
| | - Kyungwon Kwak
- Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science (IBS), Korea University, Seoul 02841, Korea.,Department of Chemistry, Korea University, Seoul 02841, Republic of Korea
| | - Euo Chang Jung
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
| | - Wansik Cha
- Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
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Götzke L, Schaper G, März J, Kaden P, Huittinen N, Stumpf T, Kammerlander KK, Brunner E, Hahn P, Mehnert A, Kersting B, Henle T, Lindoy LF, Zanoni G, Weigand JJ. Coordination chemistry of f-block metal ions with ligands bearing bio-relevant functional groups. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.01.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Kim HK, Jeong K, Cho HR, Jung EC, Kwak K, Cha W. Spectroscopic speciation of aqueous Am(iii)–oxalate complexes. Dalton Trans 2019; 48:10023-10032. [DOI: 10.1039/c9dt01087d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Speciation, thermodynamic stability, and structural information of aqueous oxalato-Am(iii) complexes were resolved by combinatorial use of UV-Vis-LWCC, TRLFS, and DFT calculations.
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Affiliation(s)
- H.-K. Kim
- Nuclear Chemistry Research Division
- Korea Atomic Energy Research Institute
- Daejeon 34057
- Republic of Korea
| | - K. Jeong
- Department of Chemistry
- Nuclear and WMD Protection Research Center
- Korea Military Academy
- Seoul 01805
- Republic of Korea
| | - H.-R. Cho
- Nuclear Chemistry Research Division
- Korea Atomic Energy Research Institute
- Daejeon 34057
- Republic of Korea
| | - E. C. Jung
- Nuclear Chemistry Research Division
- Korea Atomic Energy Research Institute
- Daejeon 34057
- Republic of Korea
| | - K. Kwak
- Center for Molecular Spectroscopy and Dynamics
- Institute for Basic Science (IBS)
- Seoul 02841
- Republic of Korea
- Department of Chemistry
| | - W. Cha
- Nuclear Chemistry Research Division
- Korea Atomic Energy Research Institute
- Daejeon 34057
- Republic of Korea
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Sturzbecher-Hoehne M, Yang P, D'Aléo A, Abergel RJ. Intramolecular sensitization of americium luminescence in solution: shining light on short-lived forbidden 5f transitions. Dalton Trans 2018; 45:9912-9. [PMID: 26961598 DOI: 10.1039/c6dt00328a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The photophysical properties and solution thermodynamics of water soluble trivalent americium (Am(III)) complexes formed with multidentate chromophore-bearing ligands, 3,4,3-LI(1,2-HOPO), Enterobactin, and 5-LIO(Me-3,2-HOPO), were investigated. The three chelators were shown to act as antenna chromophores for Am(III), generating sensitized luminescence emission from the metal upon complexation, with very short lifetimes ranging from 33 to 42 ns and low luminescence quantum yields (10(-3) to 10(-2)%), characteristic of Near Infra-Red emitters in similar systems. The specific emission peak of Am(III) assigned to the (5)D1 → (7)F1 f-f transition was exploited to characterize the high proton-independent stability of the complex formed with the most efficient sensitizer 3,4,3-LI(1,2-HOPO), with a log β110 = 20.4 ± 0.2 value. In addition, the optical and solution thermodynamic features of these Am(III) complexes, combined with density functional theory calculations, were used to probe the influence of electronic structure on coordination properties across the f-element series and to gain insight into ligand field effects.
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Affiliation(s)
- M Sturzbecher-Hoehne
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
| | - P Yang
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
| | - A D'Aléo
- Aix Marseille Université, CNRS, CINaM UMR 7325, 13288 Marseille, France.
| | - R J Abergel
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
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Dumpala RMR, Rawat N, Tomar BS. Stability, speciation and spectral properties of NpO 2+ complexes with pyridine monocarboxylates in aqueous solution. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 181:13-22. [PMID: 28314204 DOI: 10.1016/j.saa.2017.03.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 02/24/2017] [Accepted: 03/04/2017] [Indexed: 06/06/2023]
Abstract
Neptunyl ion as NpO2+ is the least reacting and most mobile radioactive species among all the actinides. The picolinic acid used for decontamination is co-disposed along with the radioactive waste. Thus, in long term storage of HLW, there is high possibility of interaction of actinides and long lived fission products with the picolinate and can cause migration. The complexation of NpO2+ with the three structural isomers of pyridine monocarboxylates provides an insight to explore the role of hetero atom (nitrogen) with respect to key binding moiety (carboxylate). In the present study, the log β values, speciation and spectral properties of NpO2+ complexes with pyridine monocarboxylates viz. picolinate, nicotinate and isonicotinate, have been studied at 298K in 0.1M NaClO4 medium using spectrophotometry. The complexation reactions involving protonated ligands are always accompanied by protonation/deprotonation process; thus, the protonation constants of all the three pyridine monocarboxylates under same conditions were also determined by potentiometry. The spectrophotometric data analysis for complexation of NpO2+ with pyridine monocarboxylates indicated the presence of ML and ML2 complexes with log β values of 2.96±0.04, 5.67±0.08 for picolinate, 1.34±0.09, 1.65±0.12 for nicotinate and 1.52±0.04, 2.39±0.06 for isonicotinate. The higher values of log β for picolinate were attributed to chelation while in other two isomers, the binding is through carboxylate group only. Density Functional Theory (DFT) calculations were carried out to get optimized geometries and electrostatic charges on various atoms of the complexes and free pyridine monocarboxylates to support the experimental data. The higher stability of NpO2+ nicotinate and isonicotinate complexes compared to simple carboxylates and the difference in log β between the two is due to the charge polarization from unbound nitrogen to the bound carboxylate oxygen atoms.
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Affiliation(s)
- Rama Mohana Rao Dumpala
- Radioanalytical Chemistry Division, Bhabha Atomic Research Center, Trombay, Mumbai 400085, India
| | - Neetika Rawat
- Radioanalytical Chemistry Division, Bhabha Atomic Research Center, Trombay, Mumbai 400085, India.
| | - B S Tomar
- Radioanalytical Chemistry Division, Bhabha Atomic Research Center, Trombay, Mumbai 400085, India
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Barkleit A, Kretzschmar J, Tsushima S, Acker M. Americium(iii) and europium(iii) complex formation with lactate at elevated temperatures studied by spectroscopy and quantum chemical calculations. Dalton Trans 2014; 43:11221-32. [DOI: 10.1039/c4dt00440j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spectroscopic techniques (NMR and ATR FT-IR) in combination with calculations (DFT) show that the hydroxyl group of the lactate is deprotonated under complex formation with Eu(iii).
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Affiliation(s)
- Astrid Barkleit
- Institute of Resource Ecology
- Helmholtz-Zentrum Dresden – Rossendorf
- 01314 Dresden, Germany
- Radiochemistry
- Department of Chemistry and Food Chemistry
| | - Jerome Kretzschmar
- Institute of Resource Ecology
- Helmholtz-Zentrum Dresden – Rossendorf
- 01314 Dresden, Germany
| | - Satoru Tsushima
- Institute of Resource Ecology
- Helmholtz-Zentrum Dresden – Rossendorf
- 01314 Dresden, Germany
| | - Margret Acker
- Central Radionuclide Laboratory
- Technische Universität Dresden
- 01062 Dresden, Germany
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