Physicochemical Properties of 1,3-Dialkylimidazolium Fluorohydrogenate Room-Temperature Molten Salts
作者： Rika Hagiwara , Kazuhiko Matsumoto , Yoji Nakamori , Tetsuya Tsuda , Yasuhiko Ito
DOI: 10.1149/1.1621414
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摘要: Reaction of some N-alkylimidazolium chlorides with anhydrous hydrogen fluoride (HF) gave nonvolatile room temperature molten salts (room ionic liquids), RMImF.2.3HF where RMIm = 1,3-dimethylimidazolium (DMIm), 1-ethyl-3-methylimidazolium (EMIm), 1-methyl-3-propylimidazolium, 1-butyl-3-methylimidazolium, 1-methyl-3-pentylimidazolium, and 1-hexyl-3-methylimidazolium. Vacuum stable at exhibited similar stoichiometry regardless the type cation. In differential scanning calorimetry (DSC) curve, DMImF.2.3HF both freezing melting on cooling heating process, respectively, while EMImF.2.3HF showed glass transition process devitrification process. The other show only DSC curves. High specific conductivities, 110 100 mS cm -1 , were observed 298 K for EMImF.2.3HF, respectively. Introduction longer alkyl side chains to imidazolium cation increased viscosity decreased conductivity. These in air did not etch a Pyrex container ambient conditions. dissociation pressures HF from negligibly small condition. electrochemical windows these was about 3 V.
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