Ammonium Pertechnetate in Mixtures of Trifluoromethanesulfonic Acid and Trifluoromethanesulfonic Anhydride
| Autor: | Jörg M. Neudörfl, Meike Kreuter, Martin Breugst, Marcus Altmaier, Dennis Grödler, Mathias S. Wickleder, Maximilian Roca Jungfer, Markus Zegke, Jörg Rothe, Christopher M. James, Thomas Sittel, Ulrich Abram, Erik Strub, Alexander Haseloer, Axel Klein |
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| Rok vydání: | 2021 |
| Předmět: |
Technology
pertechnetate Trifluoromethanesulfonic anhydride Infrared spectroscopy Ammonium pertechnetate reduction Catalysis law.invention chemistry.chemical_compound law Ammonium super acid Electron paramagnetic resonance General Chemistry General Medicine XANES anhydride chemistry ddc:540 trifluoromethanesulfonic acid Absorption (chemistry) 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften ddc:600 Trifluoromethanesulfonate Nuclear chemistry |
| Zdroj: | Angewandte Chemie / International edition 61(3), e202113777 (2022). doi:10.1002/anie.202113777 Angewandte Chemie / International edition, 61 (3), e202113777 |
| ISSN: | 1521-3773 1433-7851 |
| Popis: | Ammonium pertechnetate reacts in mixtures of trifluoromethanesulfonic anhydride and trifluoromethanesulfonic acid under final formation of ammonium pentakis(trifluoromethanesulfonato)oxidotechnetate(V), (NH$_{4}$)$_{2}$ [TcO(OTf) $_{5}$]. The reaction proceeds only at exact concentrations and under the exclusion of air and moisture via pertechnetyl trifluoromethanesulfonate, [TcO$_{3}$(OTf)], and intermediate Tc$^{VI}$ species. $^{99}$Tc nuclear magnetic resonance (NMR) has been used to study the Tc$^{VII}$ compound and electron paramagnetic resonance (EPR), $^{99}$Tc NMR and X-ray absorption near-edge structure (XANES) experiments indicate the presence of the reduced technetium species. In moist air, (NH$_{4}$)2[TcO(OTf)5] slowly hydrolyses under formation of the tetrameric oxidotechnetate(V) (NH$_{4}$)$_{4}$ [{TcO(TcO$_{4}$)$_{4}$}$_{4}$] ���10 H$_{2}$O. Single-crystal X-ray crystallography was used to determine the solid-state structures. Additionally, UV/Vis absorption and IR spectra as well as quantum chemical calculations confirm the identity of the species. |
| Databáze: | OpenAIRE |
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