Investigation of Astatine(III) Hydrolyzed Species: Experiments and Relativistic Calculations - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Journal of Physical Chemistry A Year : 2013

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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in2p3-00804191 , version 1 (25-03-2013)

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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, 2013, 117, pp.1983-1990. ⟨10.1021/jp3099413⟩. ⟨in2p3-00804191⟩
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