1
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Dovrat G, Pevzner S, Maimon E, Bogoslavsky B, Ben-Eliyahu Y, Moisy P, Bettelheim A, Zilbermann I. Macrocyclic Ligand Coordinating Amide-Arm Hydrolysis Reaction Activation in Aqueous Solutions: Tetravalent Uranium Does It Better. Inorg Chem 2024; 63:400-415. [PMID: 38150742 DOI: 10.1021/acs.inorgchem.3c03286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
Chelation of lanthanide and actinide cations within a suitable macrocyclic ligand often results in a rigid, kinetically inert, and thermodynamically stable complex. A benchmark for such cation-ligand suitability are cyclen-derived macrocyclic ligands, frequently used as large cation hosts for various applications. Herein, a comprehensive study of the 1,4,7,10-tetrakis(carbamoylmethyl)-1,4,7,10-tetraazacyclododecane ligand (DOTAM) chelates of UIV and CeIII and their properties in aqueous solutions is presented. By employing multiple analysis techniques, including X-ray crystallography, UV-vis absorbance, 1H NMR, UPLC-MS, cyclic voltammetry, and differential pulse voltammetry, the study has revealed that the two aqueous complexes undergo a spontaneous, gradual, and stepwise hydrolysis of each of the coordinated amides toward carboxylates. The coordination of UIV in the studied reaction has been shown to significantly enhance the reaction rate, leading to an acceleration of up to 6 orders of magnitude compared to the natural process of simple aqueous amides at room temperature. An attempt to describe the unusual chelated metal cation amide-activation feature, based on the relatively lower rigidity of the complex structure, is presented. Additionally, the electrochemical properties of the complex series are discussed in detail, along with the limitations of the analytical methods employed.
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Affiliation(s)
- Gev Dovrat
- Energy Engineering Department, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Svetlana Pevzner
- Chemistry Department, Nuclear Research Centre Negev, Beer Sheva 84190, Israel
| | - Eric Maimon
- Chemistry Department, Nuclear Research Centre Negev, Beer Sheva 84190, Israel
- Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Benny Bogoslavsky
- Institute of Chemistry, The Center for Nanoscience and Nanotechnology, Casali Center for Applied Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 9190401, Israel
| | | | - Philippe Moisy
- CEA, DES, ISEC, DMRC, Univ, Marcoule, Bagnols-sur-cèze 30200, France
| | - Armand Bettelheim
- Chemical Engineering Department, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Israel Zilbermann
- Chemistry Department, Nuclear Research Centre Negev, Beer Sheva 84190, Israel
- Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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2
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Gao Y, Jennifer G A, Varathan E, Schreckenbach G. Understanding the Coordination Chemistry of Am III/Cm III in the DOTA Cavity: Insights from Energetics and Electronic Structure Theory. Inorg Chem 2023; 62:3229-3237. [PMID: 36748113 DOI: 10.1021/acs.inorgchem.2c04235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The minor actinides Am/Cm show multiple possibilities for coordination, providing great opportunities for their extraction and adsorption separation. Herein, we report complexation in an aqueous medium of AmIII/CmIII in the DOTA (H4DOTA = 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) cavity with axial ligands (OH-, F-, and H2O), based on the energetics and electronic structure properties using density functional theory (DFT). The formation and substitution reactions of OH--capped complexes are more likely to occur due to their enhanced hydration Gibbs free energies, followed by F-, and then H2O. Both the longer An-ODOTA bond lengths and the larger bite angle (∠O-An-O) in the OH--capped complexes reflect the enhanced coordination provided by the axial ligand, slightly less so for F-. Energy decomposition analysis based on the electronic structure supports the preference for OH--capped complexes with a near-perfect balance between attractive and repulsive contributions toward the interaction. Furthermore, molecular orbital analysis revealed that the frontier molecular orbitals of Am and Cm complexes are substantially different; that is, the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) compositions of the Am complexes are all contributed by 5f, while the HOMO and LUMO compositions of the Cm complexes are derived from 5f and 6d, respectively. Finally, the metal-exchange reactions demonstrate competitive complexation of DOTA toward AmIII over CmIII for the OH--capped system. These results imply the importance of coordination chemistry in actinide chemistry in general and specifically in AmIII/CmIII solution chemistry.
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Affiliation(s)
- Yang Gao
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.,National Health Commission Key Laboratory of Nuclear Technology Medical Transformation, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang 621000, China.,Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Abigail Jennifer G
- Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur 603203, Tamil Nadu, India
| | - Elumalai Varathan
- Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur 603203, Tamil Nadu, India
| | - Georg Schreckenbach
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
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3
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Theoretical Study of Complexes of Tetravalent Actinides with DOTA. Symmetry (Basel) 2022. [DOI: 10.3390/sym14112451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
1,4,7,10-Tetraazacyclododecane-N,N′,N″,N‴-tetraacetic acid (H4DOTA) is a prominent chelating ligand with potential applications in various fields, from radiotherapy to the separation of fission products. The present study explores the stability, structure, and bonding properties of its complexes with tetravalent actinides (An = Th, U, Np, Pu) using density functional theory and relativistic multireference calculations. Neutral complexes prefer to form symmetric (C4) structures with DOTA. The first coordination sphere of the actinide ions is readily saturated by a weakly bonded H2O ligand. The latter ligand reduces the molecular symmetry while exerting only marginal effects on the properties of the parent complex. An-ligand bonding is mainly electrostatic, but there are also significant charge-transfer contributions from DOTA to the An 6d/5f orbitals. The charge-transfer interactions and the covalent character of bonding increase gradually in the order of Th < U < Np < Pu, as indicated by analysis of the electron density distribution using the Quantum Theory of Atoms in Molecules.
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4
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Woods JJ, Unnerstall R, Hasson A, Abou DS, Radchenko V, Thorek DLJ, Wilson JJ. Stable Chelation of the Uranyl Ion by Acyclic Hexadentate Ligands: Potential Applications for 230U Targeted α-Therapy. Inorg Chem 2022; 61:3337-3350. [PMID: 35137587 PMCID: PMC9382226 DOI: 10.1021/acs.inorgchem.1c03972] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Uranium-230 is an α-emitting radionuclide with favorable properties for use in targeted α-therapy (TAT), a type of nuclear medicine that harnesses α particles to eradicate cancer cells. To successfully implement this radionuclide for TAT, a bifunctional chelator that can stably bind uranium in vivo is required. To address this need, we investigated the acyclic ligands H2dedpa, H2CHXdedpa, H2hox, and H2CHXhox as uranium chelators. The stability constants of these ligands with UO22+ were measured via spectrophotometric titrations, revealing log βML values that are greater than 18 and 26 for the "pa" and "hox" chelators, respectively, signifying that the resulting complexes are exceedingly stable. In addition, the UO22+ complexes were structurally characterized by NMR spectroscopy and X-ray crystallography. Crystallographic studies reveal that all six donor atoms of the four ligands span the equatorial plane of the UO22+ ion, giving rise to coordinatively saturated complexes that exclude solvent molecules. To further understand the enhanced thermodynamic stabilities of the "hox" chelators over the "pa" chelators, density functional theory (DFT) calculations were employed. The use of the quantum theory of atoms in molecules revealed that the extent of covalency between all four ligands and UO22+ was similar. Analysis of the DFT-computed ligand strain energy suggested that this factor was the major driving force for the higher thermodynamic stability of the "hox" ligands. To assess the suitability of these ligands for use with 230U TAT in vivo, their kinetic stabilities were probed by challenging the UO22+ complexes with the bone model hydroxyapatite (HAP) and human plasma. All four complexes were >95% stable in human plasma for 14 days, whereas in the presence of HAP, only the complexes of H2CHXdedpa and H2hox remained >80% intact over the same period. As a final validation of the suitability of these ligands for radiotherapy applications, the in vivo biodistribution of their UO22+ complexes was determined in mice in comparison to unchelated [UO2(NO3)2]. In contrast to [UO2(NO3)2], which displays significant bone uptake, all four ligand complexes do not accumulate in the skeletal system, indicating that they remain stable in vivo. Collectively, these studies suggest that the equatorial-spanning ligands H2dedpa, H2CHXdedpa, H2hox, and H2CHXhox are highly promising candidates for use in 230U TAT.
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Affiliation(s)
- Joshua J. Woods
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853, USA
- Robert F. Smith School for Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Ryan Unnerstall
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
- Program in Quantitative Molecular Therapeutics, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Abbie Hasson
- Program in Quantitative Molecular Therapeutics, Washington University School of Medicine, St. Louis, MO, 63110, USA
- Department of Biomedical Engineering, Washington University, St. Louis, MO, 63110, USA
| | - Diane S. Abou
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
- Program in Quantitative Molecular Therapeutics, Washington University School of Medicine, St. Louis, MO, 63110, USA
| | - Valery Radchenko
- Life Science Division, TRIUMF, Vancouver, BC Canada
- Chemistry Department, University of British Columbia, Vancouver, BC, BC V6T 2A3, Canada
| | - Daniel L. J. Thorek
- Department of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA
- Program in Quantitative Molecular Therapeutics, Washington University School of Medicine, St. Louis, MO, 63110, USA
- Department of Biomedical Engineering, Washington University, St. Louis, MO, 63110, USA
| | - Justin J. Wilson
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, 14853, USA
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5
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Avraham E, Meyerstein D, Lerner A, Yardeni G, Pevzner S, Zilbermann I, Moisy P, Maimon E, Popivker I. Reactions of methyl, hydroxyl and peroxyl radicals with the DOTA chelating agent used in medical imaging. Free Radic Biol Med 2022; 180:134-142. [PMID: 34973364 DOI: 10.1016/j.freeradbiomed.2021.12.313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 12/13/2021] [Accepted: 12/27/2021] [Indexed: 12/30/2022]
Abstract
The mechanism of reaction of DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) with ·CH3, CH3O2· and ·OH radicals were studied. The radicals were formed in situ radiolytically. The methyl radicals react orders of magnitude slower with DOTA and with MIII(DOTA)- than the hydroxyl radicals. The various final products were identified and mechanisms for their formation are proposed. CH3O2· radicals do not react, or react too slowly to be observed, with DOTA and with MIII(DOTA)- as long as the central cation is not oxidized by the peroxyl radical. The results imply that synthesis of the MIII(DOTA)-(MIII = radioisotope) complexes in a water-organic solvent (ethanol or 2-propanol or acetonitrile) mixture is not only kinetically desired but the so formed complex also decreases the radiolytic decomposition of DOTA.
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Affiliation(s)
- Elad Avraham
- Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Dan Meyerstein
- Department of Chemical Sciences, The Radical Research Center and the Schlesinger Family, Center for Compact Accelerators, Radiation Sources and Application, Ariel University, Ariel, Israel; Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Ana Lerner
- Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva, Israel; Israel Atomic Energy Commission, Tel Aviv, Israel
| | - Guy Yardeni
- Chemistry Department, Nuclear Research Centre Negev, Beer-Sheva, Israel
| | - Svetlana Pevzner
- Chemistry Department, Nuclear Research Centre Negev, Beer-Sheva, Israel
| | - Israel Zilbermann
- Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva, Israel; Chemistry Department, Nuclear Research Centre Negev, Beer-Sheva, Israel
| | - Philippe Moisy
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Eric Maimon
- Chemistry Department, Ben-Gurion University of the Negev, Beer-Sheva, Israel; Chemistry Department, Nuclear Research Centre Negev, Beer-Sheva, Israel
| | - Inna Popivker
- Chemistry Department, Nuclear Research Centre Negev, Beer-Sheva, Israel.
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6
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Chen C, Sommer C, Thisgaard H, McKee V, McKenzie CJ. Facile transmetallation of [Sb III(DOTA)] - renders it unsuitable for medical applications. RSC Adv 2022; 12:5772-5781. [PMID: 35424558 PMCID: PMC8981601 DOI: 10.1039/d2ra00642a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Accepted: 02/04/2022] [Indexed: 12/03/2022] Open
Abstract
The antimony(iii) complex of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetate (DOTA) has been prepared and its exceptionally low stability observed. The Sb(iii) ion in Na[Sb(DOTA)]·4H2O shows an approximately square antiprismatic coordination geometry that is close to superimposable to the Bi(iii) geometry in [Bi(DOTA)]- in two phases containing this anion, Na[Bi(DOTA)]·4H2O, [H3O][Bi(DOTA)]·H2O for which structures are also described. Interestingly, DOTA itself in [(H6DOTA)]Cl2·4H2O·DMSO shows the same orientation of the N4O4 metal binding cavity reflecting the limited flexibility of DOTA in an octadentate coordination mode. In 8-coordinate complexes it can however accommodate M(iii) ions with r ion spanning a relatively wide range from 87 pm (Sc(iii)) to 117 pm (Bi(iii)). The larger Bi3+ ion appears to be the best metal-ligand size match since [Bi(DOTA)]- is associated with greater complex stability. In the solution state, [Sb(DOTA)]- is extremely susceptible to transmetallation by trivalent ions (Sc(iii), Y(iii), Bi(iii)) and, significantly, even by biologically important divalent metal ions (Mg(ii), Ca(ii), Zn(ii)). In all cases just one equivalent is enough to displace most of the Sb(iii). [Sb(DOTA)]- is resistant to hydrolysis; however, since biologically more abundant metal ions easily substitute the antimony, DOTA complexes will not be suitable for deployment for the delivery of the, so far unexploited, theranostic isotope pair 119Sb and 117Sb.
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Affiliation(s)
- Catherine Chen
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark Campusvej 55 5230 Odense M Denmark +45 6615 8760 +45 6550 2518
| | - Charlotte Sommer
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark Campusvej 55 5230 Odense M Denmark +45 6615 8760 +45 6550 2518
| | - Helge Thisgaard
- Department of Nuclear Medicine, Odense University Hospital Odense Denmark
- Department of Clinical Research, University of Southern Denmark Odense Denmark
| | - Vickie McKee
- School of Chemical Sciences, Dublin City University Glasnevin Dublin 9 Ireland
| | - Christine J McKenzie
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark Campusvej 55 5230 Odense M Denmark +45 6615 8760 +45 6550 2518
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7
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Yang H, Wilson JJ, Orvig C, Li Y, Wilbur DS, Ramogida CF, Radchenko V, Schaffer P. Harnessing α-Emitting Radionuclides for Therapy: Radiolabeling Method Review. J Nucl Med 2022; 63:5-13. [PMID: 34503958 PMCID: PMC8717181 DOI: 10.2967/jnumed.121.262687] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 08/05/2021] [Indexed: 11/16/2022] Open
Abstract
Targeted α-therapy (TAT) is an emerging powerful tool treating late-stage cancers for which therapeutic options are limited. At the core of TAT are targeted radiopharmaceuticals, where isotopes are paired with targeting vectors to enable tissue- or cell-specific delivery of α-emitters. DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) and DTPA (diethylenetriamine pentaacetic acid) are commonly used to chelate metallic radionuclides but have limitations. Significant efforts are underway to develop effective stable chelators for α-emitters and are at various stages of development and community adoption. Isotopes such as 149Tb, 212/213Bi, 212Pb (for 212Bi), 225Ac, and 226/227Th have found suitable chelators, although further studies, especially in vivo studies, are required. For others, including 223Ra, 230U, and, arguably 211At, the ideal chemistry remains elusive. This review summarizes the methods reported to date for the incorporation of 149Tb, 211At, 212/213Bi, 212Pb (for 212Bi), 223Ra, 225Ac, 226/227Th, and 230U into radiopharmaceuticals, with a focus on new discoveries and remaining challenges.
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Affiliation(s)
- Hua Yang
- Life Sciences Division, TRIUMF, Vancouver, British Columbia, Canada;
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Justin J Wilson
- Chemistry and Chemical Biology, Cornell University, Ithaca, New York
| | - Chris Orvig
- Medicinal Inorganic Chemistry Group, Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada
| | - Yawen Li
- Department of Radiation Oncology, University of Washington, Seattle, Washington
| | - D Scott Wilbur
- Department of Radiation Oncology, University of Washington, Seattle, Washington
| | - Caterina F Ramogida
- Life Sciences Division, TRIUMF, Vancouver, British Columbia, Canada
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Valery Radchenko
- Life Sciences Division, TRIUMF, Vancouver, British Columbia, Canada
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada; and
| | - Paul Schaffer
- Life Sciences Division, TRIUMF, Vancouver, British Columbia, Canada
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada
- Department of Radiology, University of British Columbia, Vancouver, British Columbia, Canada
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8
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Kovács A. Theoretical Study of Actinide(III)-DOTA Complexes. ACS OMEGA 2021; 6:13321-13330. [PMID: 34056480 PMCID: PMC8158830 DOI: 10.1021/acsomega.1c01292] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 04/20/2021] [Indexed: 06/12/2023]
Abstract
1,4,7,10-Tetraazacyclododecane-N,N',N″,N‴-tetraacetic acid (DOTA) is a prominent chelating ligand used in imaging contrast agents and radiopharmaceuticals. The present study explores the stabilities, structures, and bonding properties of its complexes with trivalent actinides (Ac, U, Np, Pu, Am, Cm, Cf) using density functional theory and relativistic multireference calculations. For reference purposes, the La- and Lu-DOTA complexes are also included. Similar to La3+, the large An3+ ions prefer the TSAP conformer of the ligand. The An-ligand bonding is mainly electrostatic, with minor charge transfer contributions to the An 6d orbitals. For the assessment of the thermodynamic stabilities in aqueous solution, PCM radii to use in conjunction with the SMD solvation model were developed. Basically, the thermodynamic stability of the DOTA complexes increases along the An row but with notable counteracting of spin-orbit coupling.
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Affiliation(s)
- Attila Kovács
- European Commission Joint
Research Centre, P. O. Box 2340, Karlsruhe D-76125, Germany
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9
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Gao Y, Varathan E, Grover P, Schreckenbach G. Computational Characterization of Ac III-DOTA Complexes in Aqueous Solution. Inorg Chem 2021; 60:6971-6975. [PMID: 33909433 DOI: 10.1021/acs.inorgchem.1c00254] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The 1,4,7,10-tetrazacyclodecane-1,4,7,10-tetraacetic acid (DOTA) aqueous complexes of AcIII with H2O, dimethyl sulfoxide (DMSO), OH-, and F- as axial ligands were studied using density functional theory. Formation of the [AcIII(DOTA)(OH)]2- and [AcIII(DOTA)(F)]2- complexes is predicted to be significantly more favorable than that of [AcIII(DOTA)(H2O)]- and [AcIII(DOTA)(DMSO)]- because of the enhanced relative Gibbs free energies. Further electronic structure analyses demonstrate that the type and nature of the bond between Ac and the ligand donor atom is the main driving force that determines the thermodynamic stability of the complexes. Specifically, the [AcIII(DOTA)]- complex strongly binds to OH- and F- via covalent bonds, while the bonding to H2O and DMSO is ionic and relatively weaker.
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Affiliation(s)
- Yang Gao
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.,Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Elumalai Varathan
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.,Department of Chemistry, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, India
| | - Payal Grover
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Georg Schreckenbach
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
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10
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Dovrat G, Pevzner S, Berthon C, Lerner A, Maimon E, Vainer R, Karpasas M, Ben-Elyiahu Y, Moisy P, Bettelheim A, Zilbermann I. Oligomers Intermediates in Between Two New Distinct Homonuclear Uranium(IV) DOTP Complexes*. Chemistry 2021; 27:8264-8267. [PMID: 33822408 DOI: 10.1002/chem.202005350] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Indexed: 12/19/2022]
Abstract
Two new aqueous UIV complexes were synthesized by the interaction between the tetravalent uranium cation and the (1,4,7,10-Tetraazacyclododecane-1,4,7,10-tetra(methylene phosphonic acid) (DOTP) macrocyclic ligand. Two distinct homonuclear complexes were identified; the first was characterized by X-ray crystallography as a unique "out-of-cage", [U(DOTPH6 )2 ] complex, in which the UIV cation is octa-coordinated to 4 phosphonic arms from each ligand in a square anti-prism geometry, with a C4 symmetry. The second is the "in-cage" [U(DOTPH4 )] complex, in which the tetravalent cation is located between the macrocycle O4 and N4 planes. With the help of UV-Vis absorption, 1 H/31 P NMR, ATR-IR, and MALDI-TOFMS analytical techniques, the chemical interchange between both species is presented. It is shown that the one-way transition is governed by the formation of a multiple number of soluble oligomeric species consisting of varied stoichiometric ratios of both characterized homonuclear complexes.
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Affiliation(s)
- Gev Dovrat
- Energy Engineering Department, Ben-Gurion University of the Negev Beer-Sheva, Beer-Sheva, 84105, Israel
| | - Svetlana Pevzner
- Chemistry Department, Nuclear Research Centre Negev, IL-84190, Beer-Sheva, Israel
| | - Claude Berthon
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Ana Lerner
- Israeli Atomic Energy Commission, Tel-Aviv, Israel.,Chemistry Department, Ben-Gurion University of the Negev Beer-Sheva, Beer-Sheva, 84105, Israel
| | - Eric Maimon
- Chemistry Department, Nuclear Research Centre Negev, IL-84190, Beer-Sheva, Israel.,Chemistry Department, Ben-Gurion University of the Negev Beer-Sheva, Beer-Sheva, 84105, Israel
| | - Radion Vainer
- Chemistry Department, Ben-Gurion University of the Negev Beer-Sheva, Beer-Sheva, 84105, Israel
| | - Mark Karpasas
- Research Support Laboratories, Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev Beer-Sheva, Beer-Sheva, 84105, Israel
| | | | - Philippe Moisy
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Armand Bettelheim
- Chemical Engineering Department, Ben-Gurion University of the Negev Beer-Sheva, Beer-Sheva, 84105, Israel
| | - Israel Zilbermann
- Chemistry Department, Nuclear Research Centre Negev, IL-84190, Beer-Sheva, Israel.,Chemistry Department, Ben-Gurion University of the Negev Beer-Sheva, Beer-Sheva, 84105, Israel
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11
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Carter KP, Smith KF, Tratnjek T, Deblonde GJP, Moreau LM, Rees JA, Booth CH, Abergel RJ. Controlling the Reduction of Chelated Uranyl to Stable Tetravalent Uranium Coordination Complexes in Aqueous Solution. Inorg Chem 2021; 60:973-981. [PMID: 33356197 DOI: 10.1021/acs.inorgchem.0c03088] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The solution-state interactions between octadentate hydroxypyridinone (HOPO) and catecholamide (CAM) chelating ligands and uranium were investigated and characterized by UV-visible spectrophotometry and X-ray absorption spectroscopy (XAS), as well as electrochemically via spectroelectrochemistry (SEC) and cyclic voltammetry (CV) measurements. Depending on the selected chelator, we demonstrate the controlled ability to bind and stabilize UIV, generating with 3,4,3-LI(1,2-HOPO), a tetravalent uranium complex that is practically inert toward oxidation or hydrolysis in acidic, aqueous solution. At physiological pH values, we are also able to bind and stabilize UIV to a lesser extent, as evidenced by the mix of UIV and UVI complexes observed via XAS. CV and SEC measurements confirmed that the UIV complex formed with 3,4,3-LI(1,2-HOPO) is redox inert in acidic media, and UVI ions can be reduced, likely proceeding via a two-electron reduction process.
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Affiliation(s)
- Korey P Carter
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Kurt F Smith
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Toni Tratnjek
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Gauthier J-P Deblonde
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.,Glenn T. Seaborg Institute, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Liane M Moreau
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Julian A Rees
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Corwin H Booth
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Rebecca J Abergel
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.,Department of Nuclear Engineering, University of California, Berkeley, California 94709, United States
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