Ionic Fluids Containing Both Strongly and Weakly Interacting Ions of the Same Charge Have Unique Ionic and Chemical Environments as a Function of Ion Concentration |
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| Authors: | Dr Hui Wang Steven P Kelley Jimmy W Brantley III Dr Gregory Chatel Dr Julia Shamshina Dr Jorge F B Pereira Varun Debbeti Prof Allan S Myerson Prof Robin D Rogers |
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| Affiliation: | 1. Center for Green Manufacturing and Department of Chemistry, The University of Alabama, Tuscaloosa, AL 35487 (USA);2. Current Address: 11 Forest Street Hazlehurst, GA 31539 (USA);3. Current Address: Institut de Chimie des Milieux et Matériaux de Poitiers, Université de Poitiers, 86073 Poitiers Cedex 9 (France);4. Current address: Department of Bioprocess and Biotechnology, School of Pharmaceutical Sciences, UNESP—Universidade Estadual Paulista, 14801‐902—Araraquara, SP (Brazil);5. Novartis‐MIT Center for Continuous Manufacturing and Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, 66‐568, Cambridge, MA 02139 (USA) |
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| Abstract: | Liquid multi‐ion systems made by combining two or more salts can exhibit charge ordering and interactions not found in the parent salts, leading to new sets of properties. This is investigated herein by examining a liquid comprised of a single cation, 1‐ethyl‐3‐methylimidazolium (C2mim]+), and two anions with different properties, acetate (OAc]?) and bis(trifluoromethylsulfonyl)imide (NTf2]?). NMR and IR spectroscopy indicate that the electrostatic interactions are quite different from those in either C2mim]OAc] or C2mim]NTf2]. This is attributed to the ability of OAc]? to form complexes with the C2mim]+ ions at greater than 1:1 stoichiometries by drawing C2mim]+ ions away from the less basic NTf2]? ions. Solubility studies with molecular solvents (ethyl acetate, water) and pharmaceuticals (ibuprofen, diphenhydramine) show nonlinear trends as a function of ion content, which suggests that solubility can be tuned through changes in the ionic compositions. |
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| Keywords: | concentration effects ionic liquids IR spectroscopy NMR spectroscopy solvent effects |
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