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Investigation of Astatine(III) Hydrolyzed Species: Experiments and Relativistic Calculations

Abstract : This work aims to resolve some controversies about astatine(III) hydroxide species present in oxidant aqueous solution. AtO+ is the dominant species existing under oxidizing and acidic pH conditions. This is consistent with highperformance ion-exchange chromatography data showing the existence of one species holding one positive charge. A change in speciation occurs as the pH changes from 1 to 4, while remaining under oxidizing conditions. Dynamic experiments with ion-exchange resins evidence the existence of a neutral species witnessed by its elution in the void volume. Batch-experiments using a competition method show the exchange of one proton indicating the formation of the AtO(OH) species. The hydrolysis thermodynamic constant, extrapolated to zero ionic strength, was determined to be 10−1.9. This value is supported by two-component relativistic quantum calculations and therefore allows disclosing unambiguously the structure of the formed species.
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http://hal.in2p3.fr/in2p3-00804191
Contributor : Julie Champion <>
Submitted on : Monday, March 25, 2013 - 1:32:12 PM
Last modification on : Tuesday, July 21, 2020 - 10:34:02 AM

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Julie Champion, A. Sabatié-Gogova, F. Bassal, T. Ayed, C. Alliot, et al.. Investigation of Astatine(III) Hydrolyzed Species: Experiments and Relativistic Calculations. Journal of Physical Chemistry A, American Chemical Society, 2013, 117, pp.1983-1990. ⟨10.1021/jp3099413⟩. ⟨in2p3-00804191⟩

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