SummaryX-ray absorption spectroscopy has been used to establish polymer formation of Tc(IV) in aqueous solutions of NaAs the molybdenum chemistry show similarities to that of technetium, we used MoOIn aqueous solution, some polymers are formed regardless to the nature of the media composition: Tc-Tc=2.50 ± 0.02 Å. The general structure is in agreement with a first coordination shell containing 6 O. The modelling shows that, in the first coordination shell, there is no chloride ligand. The observed geometries are close to those found for TcOCombination of these results with XANES led to attribute Tc
Technetium / Pertechnetate / Speciation / ChlorideSummary. The speciation of tetravalent technetium has been studied in HCl solutions ranging from 1.0 to 6.0 M. Tc(IV) exists in 6.0 M HCl as the well characterized TcCl 6 2− chloride complex. In 1.0 M HCl, the chloride ligands of TcCl 6 2− are slowly substituted by other ligands such as H(4−m−2n− p)+ compounds may form with (m + n + p + q) = 6. Several speciation techniques such as UV-visible and Raman spectrometries, X-ray absorption spectroscopy and electrochemistry have enabled to get an insight into this problem. All the results have indicated two most likely species of Tc(IV) after aging for about ten days in 1.0 M HCl to be aquo-chlorocomplexes of technetium and not oxo-chorocomplexes: TcCl 5 · H 2 O − and TcCl 4 · 2H 2 O.
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