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Ammonium Pertechnetate in Mixtures of Trifluoromethanesulfonic Acid and Trifluoromethanesulfonic Anhydride. | LitMetric
Ammonium pertechnetate reacts in mixtures of trifluoromethanesulfonic anhydride and trifluoromethanesulfonic acid under final formation of ammonium pentakis(trifluoromethanesulfonato)oxidotechnetate(V), (NH ) [TcO(OTf) ]. The reaction proceeds only at exact concentrations and under the exclusion of air and moisture via pertechnetyl trifluoromethanesulfonate, [TcO (OTf)], and intermediate Tc species. Tc nuclear magnetic resonance (NMR) has been used to study the Tc compound and electron paramagnetic resonance (EPR), Tc NMR and X-ray absorption near-edge structure (XANES) experiments indicate the presence of the reduced technetium species. In moist air, (NH ) [TcO(OTf) ] slowly hydrolyses under formation of the tetrameric oxidotechnetate(V) (NH ) [{TcO(TcO ) } ] ⋅10 H 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.
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