3 years ago

The Nature of the Technetium Species Formed During the Oxidation of Technetium Dioxide with Oxygen and Water.

Daniel S. Mast, Bradley Childs, Roger Alberto, Kenneth R. Czerwinski, Paul M. Forster, Derek R. Peterson, Laurent Bigler, Urs Stalder, Keith V. Lawler, Alek Jansen, Frederic Poineau, Alfred P. Sattelberger, Henrik Braband
The oxidation of TcO₂ with O₂ in the presence of H₂O at 250 °C was investigated; Tc₂O₇ and a red product were observed after the reaction. UV-visible spectroscopy and cerium titration on the 'red' product are consistent with the presence of a reduced Tc species. It is proposed that the 'red' product was formed by the hydrolysis of Tc₂O₇ to HTcO₄ followed by the reduction of HTcO₄. The reaction products of TcO₂ with O₂/H₂O at 250 °C were also studied by mass spectrometry. The main dinuclear species were Tc₂O₇ and Tc₂O₅, while the main mononuclear species were TcO₃ and HTcO₄. The compound HTcO4 and associated hydrates were simulated to identify candidate structures for the 'red' product; however, neither the acid nor any related hydrates exhibited the UV-Visible signature of the 'red' product.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201701199

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