Non‐Ideal Mixing Behaviour of Hydrogen Bonding in Mixtures of Protic Ionic Liquids |
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Authors: | Dr. Koichi Fumino Anne‐Marie Bonsa Benjamin Golub Dr. Dietmar Paschek Prof. Dr. Ralf Ludwig |
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Affiliation: | 1. Universit?t Rostock, Institut für Chemie, Abteilung für Physikalische Chemie, Dr.‐Lorenz‐Weg 1, 18059, Rostock (Germany), Tel: (+49) 381‐498‐6517;2. Leibniz‐Institut für Katalyse an der Universit?t Rostock e.V. Albert‐Einstein‐Str. 29a, 18059 Rostock (Germany) |
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Abstract: | Ionic liquids (ILs) attract interest in science and technology as a result of their unique properties. Binary and ternary mixtures of ILs significantly increase the number of possible cation/anion combinations, resulting in targeted physical and chemical properties. In this work, we study the mixing behaviour of two protic ILs: triethyl ammonium methylsulfonate [Et3NH][CH3SO3] and triethylammonium triflate [Et3NH][CF3SO3]. We find a characteristic deviation from ideal mixing by means of low‐frequency infrared spectroscopy. By using molecular dynamics simulations, we explain this behaviour as being the result of different strengths of anion/cation hydrogen bonding. This non‐ideality of non‐random H‐bond mixing is also reflected in macroscopic properties such as the viscosity. Mixing suitable ILs may, thus, result in new ILs with targeted physical properties. |
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Keywords: | ionic liquids IR spectroscopy mixing behaviour molecular dynamics solvation chemistry |
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