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- W4382651907 endingPage "100060" @default.
- W4382651907 startingPage "100060" @default.
- W4382651907 abstract "Ionic liquids are modern materials with a broad range of applications, including electrochemical devices, the exploitation of sustainable resources and chemical processing. Expanding the chemical space to include novel ion classes allows for the elucidation of novel structure-property relationships and fine tuning for specific applications. We prepared a set of ionic liquids based on the sparsely investigated pentamethyl guanidinium cation with a 2-ethoxy-ethyl side chain in combination with a series of frequently used anions. The resulting properties are compared to a cation with a pentyl side chain lacking ether functionalization. We measured the thermal transitions and transport properties to estimate the performance and trends of this cation class. The samples with imide-type anions form liquids at ambient temperature, and show good transport properties, comparable to imidazolium or ammonium ionic liquids. Despite the dynamics being significantly accelerated, ether functionalization of the cation favors the formation of crystalline solids. Single crystal structure analysis, ab initio calculations and variable temperature nuclear magnetic resonance measurements (VT-NMR) revealed that cation conformations for the ether- and alkyl-chain-substituted are different in both the solid and liquid states. While ether containing cations adopt compact, curled structures, those with pentyl side chains are linear. The Eyring plot revealed that the curled conformation is accompanied by a higher activation energy for rotation around the carbon-nitrogen bonds, due to the coordination of the ether chain as observed by VT-NMR." @default.
- W4382651907 created "2023-07-01" @default.
- W4382651907 creator A5003990945 @default.
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- W4382651907 creator A5070036794 @default.
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- W4382651907 creator A5077852818 @default.
- W4382651907 date "2023-12-01" @default.
- W4382651907 modified "2023-10-17" @default.
- W4382651907 title "Dynamics, cation conformation and rotamers in guanidinium ionic liquids with ether groups" @default.
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