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Solvent Effects on the NMR Chemical Shifts of Imidazolium-Based Ionic Liquids and Cellulose Therein |
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| Authors: | Stephanie Hesse-Ertelt Thomas Heinze Birgit Kosan Katrin Schwikal Frank Meister |
| Institution: | 1. Thuringian Institute for Textile and Plastics Research, Breitscheidstrasse 97, D-07407 Rudolstadt, Germany;2. Thuringian Institute for Textile and Plastics Research, Breitscheidstrasse 97, D-07407 Rudolstadt, Germany
Friedrich Schiller University of Jena, Institute of Organic Chemistry and Macromolecular Chemistry, Centre of Excellence for Polysaccharide Research, Humboldtstrasse 10, D-07743 Jena, Germany |
| 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 %). |
| Keywords: | 1H-NMR 13C-NMR chemical shift (CS) cellulose dope ionic liquid (IL) imidazolium nuclear magnetic resonance (NMR) |