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Interaction between the Cesium Cation and Cesium Carboxylates: An Extended Cs+ Basicity Scale

Authors

  • Dr. Charly Mayeux,

    1. Institute of Chemistry, Chair of Chemical Physics, University of Tartu, Ravila 14A, Tartu 50411 (Estonia)
    2. Institut de Chimie de Nice, UMR CNRS 7272, University of Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2 (France)
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  • Dr. Jaana Tammiku-Taul,

    1. Institute of Chemistry, Chair of Chemical Physics, University of Tartu, Ravila 14A, Tartu 50411 (Estonia)
    2. Institute of Chemistry, Chair of Molecular Technology, Tallinn University of Technology, Akadeemia 15, Tallinn 12618 (Estonia)
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  • Dr. Lionel Massi,

    1. Institut de Chimie de Nice, UMR CNRS 7272, University of Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2 (France)
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  • Prof. Jean-François Gal,

    Corresponding author
    1. Institut de Chimie de Nice, UMR CNRS 7272, University of Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2 (France)
    • Institut de Chimie de Nice, UMR CNRS 7272, University of Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2 (France)
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  • Prof. Peeter Burk

    Corresponding author
    1. Institute of Chemistry, Chair of Chemical Physics, University of Tartu, Ravila 14A, Tartu 50411 (Estonia)
    • Institute of Chemistry, Chair of Chemical Physics, University of Tartu, Ravila 14A, Tartu 50411 (Estonia)
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Abstract

The interaction between the cesium cation and fulvic or humic acids is supposed to play a role in cesium mobility in the environment, which is of importance in the context of geographical dispersion or concentration of the corresponding radionuclides. Among the singly charged positive clusters generated by electrospray ionization of mixtures of carboxylic acids (AH) and cesium salts (nitrate, iodide, or trifluoroacetate), the cluster [ACs+]Cs+[A′Cs+] was subjected to collision-induced dissociation. The fragmentation into Cs+[ACs+] and Cs+[A′Cs+] was treated using the kinetic method. A gas-phase basicity ladder was built by a step-by-step addition of the relative basicity data. The relative basicity scale deduced from the kinetic method was calibrated using the affinity and basicity (the enthalpy and Gibbs energy scales, respectively) obtained from DFT calculations. The enhanced basicity of the polyacid salts, relative to their monoacid salts, as well as the substituent effects on aliphatic and aromatic structures, are discussed.

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