• Open Access

Mutual Lewis Acid–Base Interactions of Cations and Anions in Ionic Liquids

Authors

  • Dr. Markus Holzweber,

    Corresponding author
    1. Vienna University of Technology, Institute of Chemical Engineering and Analytics, Getreidemarkt 9/164.AC, 1060 Vienna (Austria)
    • Vienna University of Technology, Institute of Chemical Engineering and Analytics, Getreidemarkt 9/164.AC, 1060 Vienna (Austria)
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  • Dr. Ralf Lungwitz,

    1. Chemnitz University of Technology, Institute of Chemistry, Strasse der Nationen 62, 09111 Chemnitz (Germany)
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  • Denise Doerfler,

    1. Vienna University Of Technology, Institute of Applied Synthetic Chemistry, Getreidemarkt 9/163-AC, 1060 Vienna (Austria)
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  • Prof. Dr. Stefan Spange,

    1. Chemnitz University of Technology, Institute of Chemistry, Strasse der Nationen 62, 09111 Chemnitz (Germany)
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  • Prof. Dr. Mihkel Koel,

    1. Tallinn Technical University, Institute of Chemistry, Akadeemia Tee 15, Tallinn 12618 (Estonia)
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  • Prof. Dr. Herbert Hutter,

    1. Vienna University of Technology, Institute of Chemical Engineering and Analytics, Getreidemarkt 9/164.AC, 1060 Vienna (Austria)
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  • Prof. Wolfgang Linert

    Corresponding author
    1. Vienna University Of Technology, Institute of Applied Synthetic Chemistry, Getreidemarkt 9/163-AC, 1060 Vienna (Austria)
    • Vienna University Of Technology, Institute of Applied Synthetic Chemistry, Getreidemarkt 9/163-AC, 1060 Vienna (Austria)
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Abstract

Solute properties are known to be strongly influenced by solvent molecules due to solvation. This is due to mutual interaction as both the properties of the solute and of the solvent strongly depend on each other. The present paper is based on the idea that ionic liquids are cations solvated by anions and anions solvated by cations. To show this (in this system strongly pronounced) interaction the long time established donor–acceptor concept for solvents and ions in solution by Viktor Gutmann is extended to ionic liquids. A number of solvent parameters, such as the Kamlet–Abboud–Taft and the Dimroth–Reichardt ET scale for ionic liquids neglect this mutual influence, which, however, seems to be in fact necessary to get a proper description of ionic liquid properties. It is shown how strong such parameters vary when the influence of the counter ion is taken into account. Furthermore, acceptor and donor numbers for ionic liquids are presented.

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