• Open Access

Significant Cation Effects in Carbon Dioxide–Ionic Liquid Systems

Authors

  • Dr. Oldamur Hollóczki,

    1. Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103 Leipzig (Germany)
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  • Zsolt Kelemen,

    1. Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1111 Budapest (Hungary)
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  • László Könczöl,

    1. Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1111 Budapest (Hungary)
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  • Dr. Dénes Szieberth,

    1. Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1111 Budapest (Hungary)
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  • Prof. Dr. László Nyulászi,

    Corresponding author
    1. Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1111 Budapest (Hungary)
    • Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, 1111 Budapest (Hungary)
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  • Dr. Annegret Stark,

    1. Institut für Technische Chemie, Universität Leipzig, Linnéstr. 3–4, 04103 Leipzig (Germany)
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  • Prof. Dr. Barbara Kirchner

    Corresponding author
    1. Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103 Leipzig (Germany)
    • Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103 Leipzig (Germany)
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Abstract

Carbon dioxide–ionic liquid systems are of great current interest, and significant efforts have been made lately to understand the intermolecular interactions in these systems. In general, all the experimental and theoretical studies have concluded so far that the main solute–solvent interaction takes effect through the anion, and the cation has no, or only a secondary role in solvation. In this theoretical approach it is shown that this view is unfounded, and evidence is provided that, similarly to the benzene–CO2 system, dispersion interactions are present between the solute and the cation. Therefore, this defines a novel site for tailoring solvents to tune CO2 solubility.

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