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Dardenne K, Duckworth S, Gaona X, Polly R, Schimmelpfennig B, Pruessmann T, Rothe J, Altmaier M, Geckeis H. A Combined Study of Tc Redox Speciation in Complex Aqueous Systems: Wet-Chemistry, Tc K-/L 3-Edge X-ray Absorption Fine Structure, and Ab Initio Calculations. Inorg Chem 2021; 60:12285-12298. [PMID: 34328309 DOI: 10.1021/acs.inorgchem.1c01487] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The combination of wet-chemistry experiments (measurements of pH, Eh, and [Tc]) and advanced spectroscopic techniques (K- and L3-edge X-ray absorption fine structure spectroscopy) confirms the formation of a very stable Tc(V)-gluconate complex under anoxic conditions. In the presence of gluconate and an excess of Sn(II) (at pe + pH ≈ 2), technetium forms a very stable Tc(IV)-gluconate complex significantly enhancing the solubility defined by TcO2(s) in hyperalkaline gluconate-free systems. A new setup for "tender" X-ray spectroscopy (spectral range, ∼2-5 keV) in transmission or total fluorescence yield detection mode based on a He flow cell has been developed at the INE Beamline for radionuclide science (KIT light source). This setup allows handling of radioactive specimens with total activities up to one million times the exemption limit. For the first time, Tc L3-edge measurements (∼2.677 keV) of Tc species in liquid (aqueous) media are reported, clearly outperforming conventional K-edge spectroscopy as a tool to differentiate Tc oxidation states and coordination environments. The coupling of L3-edge X-ray absorption near-edge spectroscopy measurements and relativistic multireference ab initio methods opens new perspectives in the definition of chemical and thermodynamic models for systems of relevance in the context of nuclear waste disposal, environmental, and pharmaceutical applications.
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Affiliation(s)
- Kathy Dardenne
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Sarah Duckworth
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Xavier Gaona
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Robert Polly
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Bernd Schimmelpfennig
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Tim Pruessmann
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Jörg Rothe
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Marcus Altmaier
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Horst Geckeis
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
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Alberto R, Bläuenstein P, Anderegg G, Albinati A. Synthesis and characterization of Tc(IV)-alcoholato complexes. J Labelled Comp Radiopharm 2011. [DOI: 10.1002/jlcr.25802601116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Schwochau K. Technetium-Radiodiagnostica – Grundlagen, Synthese, Struktur, Entwicklung. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941062205] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kroesbergen J, Gelsema WJ, de Ligny CL. 99mTc bone scanning agents--III. Preparation and gel chromatography of 99mTc(Sn)MDP complexes. INTERNATIONAL JOURNAL OF NUCLEAR MEDICINE AND BIOLOGY 1986; 12:419-24. [PMID: 3710704 DOI: 10.1016/s0047-0740(86)80002-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The preparation of 99mTc(Sn)MDP was investigated as a function of pH, MDP concentration and Sn(II) concentration. The labeling efficiency was over 90% in the majority of the experiments and remained constant over the range pH 2-9. The MDP concentration had little effect, while the Sn(II) concentration had a significant positive influence. The complex formation appeared to be partly reversible. The formation of different complexes was investigated by means of gel chromatography under various experimental conditions. Altogether six complexes were found. At acid conditions two major complexes were found and at neutral pH one major complex. The presence or absence of a particular complex was mainly determined by the pH and by the MDP concentration. The Sn(II) concentration had very little effect. The results are compared with previous results of similar experiments with 99mTc(Sn)pyrophosphate.
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Baldas J, Bonnyman J. Substitution reactions of 99mTcNCl-4--A route to a new class of 99mTc-radiopharmaceuticals. THE INTERNATIONAL JOURNAL OF APPLIED RADIATION AND ISOTOPES 1985; 36:133-9. [PMID: 2984125 DOI: 10.1016/0020-708x(85)90228-5] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The preparation of sodium tetrachloronitridotechnetate Na[99mTcNCl4] is described. This complex may be used for the preparation by a substitution route of 99mTc-radiopharmaceuticals containing a Tc-nitrido(TcN) group. The labelling procedure was demonstrated by the preparation of [99mTcN]MDP, [99mTcN]DTPA and [99mTcN]cysteine. Biological distribution studies in mice of these complexes showed that the presence of the nitrido group produced a radiopharmaceutical with different biological behaviour to that produced when conventional reduction methods are used with the same ligand. HPLC studies confirmed that the use of the 99mTcNCl-4 substitution route produced radiopharmaceuticals of high radiochemical purity.
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Preparation and characterization of technetium(IV)-complexes with diethylenetriaminepentaacetic acid and ethylenediaminetetraacetic acid as ligands. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/0020-708x(83)90059-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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