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Greif G, Sauerwein FS, Weßling P, Duckworth TM, Patzschke M, Gericke R, Sittel T, März J, Wilden A, Modolo G, Panak PJ, Roesky PW. 6-(6-Methyl-1,2,4,5-Tetrazine-3-yl)-2,2'-Bipyridine: A N-Donor Ligand for the Separation of Lanthanides(III) and Actinides(III). Inorg Chem 2024. [PMID: 39101694 DOI: 10.1021/acs.inorgchem.4c01793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/06/2024]
Abstract
Here, we report the synthesis of the 6-(6-methyl-1,2,4,5-tetrazine-3-yl)-2,2'-bipyridine (MTB) ligand that has been developed for lanthanide/actinide separation. A multimethod study of the complexation of MTB with trivalent actinide and lanthanide ions is presented. Single-crystal X-ray diffraction measurements reveal the formation of [Ce(MTB)2(NO3)3], [Pr(MTB)(NO3)3H2O], and [Ln(MTB)(NO3)3MeCN] (Ln = Nd, Sm, Eu, Gd). In addition, the complexation of Cm(III) with MTB in solution was studied by time-resolved laser fluorescence spectroscopy. The results show the formation of [Cm(MTB)1-3]3+ complexes, which occur in two different isomers. Quantum chemical calculations reveal an energy difference between these isomers of 12 kJ mol-1, clarifying the initial observations made by time-resolved laser fluorescence spectroscopy (TRLFS). Furthermore, quantum theory of atoms in molecules (QTAIM) analysis of the Cm(III) and Ln(III) complexes was performed, indicating a stronger covalent contribution in the Cm-N interaction compared to the respective Ln-N interaction. These findings align well with extraction data showing a preferred extraction of Am and Cm over lanthanides (e.g., max. SFAm/Eu = 8.3) at nitric acid concentrations <0.1 mol L-1 HNO3.
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Affiliation(s)
- Gerlinde Greif
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr. 15, 76131 Karlsruhe, Germany
| | - Fynn S Sauerwein
- Institute of Fusion Energy and Nuclear Waste Management─Nuclear Waste Management (IFN-2), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Patrik Weßling
- Institute of Physical Chemistry, Heidelberg University, 69120 Heidelberg, Germany
| | - Tamara M Duckworth
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Michael Patzschke
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Robert Gericke
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Thomas Sittel
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Juliane März
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Andreas Wilden
- Institute of Fusion Energy and Nuclear Waste Management─Nuclear Waste Management (IFN-2), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Giuseppe Modolo
- Institute of Fusion Energy and Nuclear Waste Management─Nuclear Waste Management (IFN-2), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Petra J Panak
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Institute of Physical Chemistry, Heidelberg University, 69120 Heidelberg, Germany
| | - Peter W Roesky
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstr. 15, 76131 Karlsruhe, Germany
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Stracke J, Weßling P, Sittel T, Adam C, Rominger F, Geist A, Panak PJ. 2,6-Bis(5-( tert-butyl)-1 H-pyrazol-3-yl)pyridine: Effects of the Peripheral Aliphatic Side Chain on the Coordination of Actinides(III) and Lanthanides(III). Inorg Chem 2024; 63:13214-13222. [PMID: 38842049 DOI: 10.1021/acs.inorgchem.4c00396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
To improve our understanding of the interaction mechanism in trivalent lanthanide and actinide complexes, studies with structurally different hard and soft donor ligands are of great interest. For that reason, the coordination chemistry of An(III) and Ln(III) with 2,6-bis(5-(tert-butyl)-1H-pyrazol-3-yl)pyridine (C4-BPP) has been explored. Time-resolved laser fluorescence spectroscopy (TRLFS) studies have revealed the formation of [Cm(C4-BPP)n]3+ (n = 1-3) (log β1' = 7.2 ± 0.4, log β2' = 10.1 ± 0.5, and log β3' = 11.8 ± 0.6) and [Eu(C4-BPP)m]3+ (m = 1-2) (log β1' = 4.9 ± 0.2 and log β2' = 8.0 ± 0.4). The absence of the [Eu(C4-BPP)3]3+ complex shows a more favorable complexation of Cm(III) over that of Eu(III). Additionally, complementary NMR measurements have been conducted to examine the M(III)-N bond in Ln(III) and Am(III) C4-BPP complexes. 15N NMR data have revealed notable differences in the chemical shifts of the coordinating nitrogen atoms between the Am(III) and Ln(III) complexes. In the Am(III) complex, the coordinating nitrogen atoms have shown a shift by 260 ppm, indicating a higher fraction of covalent bonding in the Am(III)-N bond compared with the Ln(III)-N bond. This observation aligns excellently with the differences in the stability constants obtained from TRLFS studies.
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Affiliation(s)
- Jonas Stracke
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, Karlsruhe 76021, Germany
- Institut für Physikalische Chemie, Heidelberg University, Im Neuenheimer Feld 253, Heidelberg 69120, Germany
| | - Patrik Weßling
- Institut für Physikalische Chemie, Heidelberg University, Im Neuenheimer Feld 253, Heidelberg 69120, Germany
| | - Thomas Sittel
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, Karlsruhe 76021, Germany
| | - Christian Adam
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, Karlsruhe 76021, Germany
| | - Frank Rominger
- Institut für Organische Chemie, Heidelberg University, Im Neuenheimer Feld 270, Heidelberg 69120, Germany
| | - Andreas Geist
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, Karlsruhe 76021, Germany
| | - Petra J Panak
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, Karlsruhe 76021, Germany
- Institut für Physikalische Chemie, Heidelberg University, Im Neuenheimer Feld 253, Heidelberg 69120, Germany
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Verlinden B, Wilden A, Van Hecke K, J. M. Egberink R, Huskens J, Verboom W, Hupert M, Weßling P, Geist A, Panak PJ, Hermans R, Verwerft M, Modolo G, Binnemans K, Cardinaels T. Solvent Optimization Studies for a New EURO-GANEX Process with 2,2’-Oxybis( N,N-di- n-decylpropanamide) (mTDDGA) and Its Radiolysis Products. SOLVENT EXTRACTION AND ION EXCHANGE 2022. [DOI: 10.1080/07366299.2022.2125151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/10/2022]
Affiliation(s)
- Bart Verlinden
- Belgian Nuclear Research Centre (SCK CEN), Institute for Nuclear Materials Science, Mol, Belgium
- Department of Chemistry, KU Leuven, Leuven, Belgium
| | - Andreas Wilden
- Institut für Energie- und Klimaforschung - Nukleare Entsorgung und Reaktorsicherheit- (IEK-6), Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Karen Van Hecke
- Belgian Nuclear Research Centre (SCK CEN), Institute for Nuclear Materials Science, Mol, Belgium
| | - Richard J. M. Egberink
- Molecular Nanofabrication group, Department of Molecules & Materials, Mesa+ Institute, University of Twente, Enschede, The Netherlands
| | - Jurriaan Huskens
- Molecular Nanofabrication group, Department of Molecules & Materials, Mesa+ Institute, University of Twente, Enschede, The Netherlands
| | - Willem Verboom
- Molecular Nanofabrication group, Department of Molecules & Materials, Mesa+ Institute, University of Twente, Enschede, The Netherlands
| | - Michelle Hupert
- Zentralinstitut für Engineering, Elektronik und Analytik (ZEA-3), Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Patrik Weßling
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
- Institut für Physikalische Chemie, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
| | - Andreas Geist
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Petra J. Panak
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
- Institut für Physikalische Chemie, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
| | - Rainier Hermans
- Belgian Nuclear Research Centre (SCK CEN), Institute for Nuclear Materials Science, Mol, Belgium
- Faculteit Industriële Ingenieurswetenschappen, UHasselt – KU Leuven, Diepenbeek, Belgium
| | - Marc Verwerft
- Belgian Nuclear Research Centre (SCK CEN), Institute for Nuclear Materials Science, Mol, Belgium
| | - Giuseppe Modolo
- Institut für Energie- und Klimaforschung - Nukleare Entsorgung und Reaktorsicherheit- (IEK-6), Forschungszentrum Jülich GmbH, Jülich, Germany
| | | | - Thomas Cardinaels
- Belgian Nuclear Research Centre (SCK CEN), Institute for Nuclear Materials Science, Mol, Belgium
- Department of Chemistry, KU Leuven, Leuven, Belgium
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