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Solvent Effects on the NMR Chemical Shifts of Imidazolium-Based Ionic Liquids and Cellulose Therein

Authors

  • Stephanie Hesse-Ertelt,

    Corresponding author
    1. Thuringian Institute for Textile and Plastics Research, Breitscheidstrasse 97, D-07407 Rudolstadt, Germany
    2. Friedrich Schiller University of Jena, Institute of Organic Chemistry and Macromolecular Chemistry, Centre of Excellence for Polysaccharide Research, Humboldtstrasse 10, D-07743 Jena, Germany
    • Thuringian Institute for Textile and Plastics Research, Breitscheidstrasse 97, D-07407 Rudolstadt, Germany, Fax: +49- 3641 9 48272; Fax: +49- 3672 379 379.
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  • Thomas Heinze,

    1. Thuringian Institute for Textile and Plastics Research, Breitscheidstrasse 97, D-07407 Rudolstadt, Germany
    2. Friedrich Schiller University of Jena, Institute of Organic Chemistry and Macromolecular Chemistry, Centre of Excellence for Polysaccharide Research, Humboldtstrasse 10, D-07743 Jena, Germany
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  • Birgit Kosan,

    1. Thuringian Institute for Textile and Plastics Research, Breitscheidstrasse 97, D-07407 Rudolstadt, Germany
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  • Katrin Schwikal,

    1. Thuringian Institute for Textile and Plastics Research, Breitscheidstrasse 97, D-07407 Rudolstadt, Germany
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  • Frank Meister

    Corresponding author
    1. Thuringian Institute for Textile and Plastics Research, Breitscheidstrasse 97, D-07407 Rudolstadt, Germany
    • Thuringian Institute for Textile and Plastics Research, Breitscheidstrasse 97, D-07407 Rudolstadt, Germany, Fax: +49- 3641 9 48272; Fax: +49- 3672 379 379.
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Abstract

The interactions of ionic liquids (IL) with solvents usually used in liquid-state nuclear magnetic resonance (NMR) spectroscopy are studied. The 1H- and 13C-NMR chemical shift values of 1-n-butyl-3-methyl (BM)- and 1-ethyl-3-methyl (EM)-substituted imidazolium (IM) -chlorides (Cl) and -acetates (Ac) are determined before and after diluting with deuterated solvents (DMSO-d6, D2O, CD3OD, and CDCl3). The dilution offers structural modifications of the IL due to the solvents capacity to ionization. For further investigation of highly viscous cellulose dopes made of imidazolium-based IL, solid-state NMR spectroscopy enables the reproducibility of liquid-state NMR data of pure IL. The correlation of liquid- and solid-state NMR is shown on EMIM-Ac and cellulose/EMIM-Ac dope (10 wt %).

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