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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Structure-Property Correlation in Phenyl N-Substituted Imidazolium Protic Ionic Liquids
Nicole Abdou1, Elisabet Ahlberg2, Anna Martinelli1
1Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
Abstract:
Establishing the correlation between chemical structure and physicochemical properties in protic ionic liquids is essential for their rationale design and application. In this context, the recently developed protic ionic liquids, benzylimidazolium bis(trifluoromethylsulfonyl)imide and n-phenylimidazolium bis(trifluoromethylsulfonyl)imide, are characterized with focus on phase behavior, thermal stability, intermolecular interactions, transport, and electrochemical properties, using a wide range of experimental methods. Compared to the chemical structure of the archetypal protic ionic liquid, 1-ethylimidazolium bis(trifluoromethylsulfonyl)imide, the addition of a phenyl group to the cation results in reduced thermal stability, increased viscosity, stronger intermolecular interactions, and lower ionic conductivity, while maintaining comparable fragility, and a wider electrochemical stability window.
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