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Reaction with SO3 in Ionic Liquids: The Example of K2(S2O7)­(H2SO4)

Authors

  • Alexander Weiz,

    1. Carl von Ossietzky Universität Oldenburg, Institut für Chemie, Carl-von-Ossietzky Straße 9–11, 26129 Oldenburg, Germany
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  • Jörn Bruns,

    1. Carl von Ossietzky Universität Oldenburg, Institut für Chemie, Carl-von-Ossietzky Straße 9–11, 26129 Oldenburg, Germany
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  • Mathias S. Wickleder

    Corresponding author
    1. Carl von Ossietzky Universität Oldenburg, Institut für Chemie, Carl-von-Ossietzky Straße 9–11, 26129 Oldenburg, Germany
    • Carl von Ossietzky Universität Oldenburg, Institut für Chemie, Carl-von-Ossietzky Straße 9–11, 26129 Oldenburg, Germany, Fax: +49-441-798-3352

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  • Supporting Information for this article is available on the WWW under http://dx.doi.org/10.1002/zaac.201300416 or from the author.

Abstract

The ionic liquid 1-butyl-3-methylimidazolium hydrogensulfate, [bmim]HSO4, turned out to be resistant even to strong oxidizers like SO3. Thus, it should be a suitable solvent for the preparation of polysulfates at low temperatures. As a proof of principle we here present the synthesis and crystal structure of K2(S2O7)(H2SO4), which has been obtained from the reaction of K2SO4 and SO3 in [bmim]HSO4. In the crystal structure of K2(S2O7)(H2SO4) (orthorhombic, Pbca, Z = 8, a = 810.64(2) pm, b = 1047.90(2) pm, c = 2328.86(6) pm, V = 1978.30(8) Å3) two crystallographically unique potassium cations are coordinated by a different number of monodentate and bidentate-chelating disulfate anions as well as by sulfuric acid molecules. The crystal structure consists of alternating layers of [K2(S2O7)] slabs and H2SO4 molecules. Hydrogen bonds between hydrogen atoms of sulfuric acid molecules and oxygen atoms of the neighboring disulfate anions are observed.

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