Abstract
Ionic liquids (ILs) may acceptably be defined as fluid semi-organic salts composed entirely of bulky asymmetric organic cations and organic or inorganic anions at or near room tem‐ perature. There is considerable consensus that a qualified IL must melt below 100 °C. Ionic liquids are salt, existing in the liquid phase at and around 298 K. A typical IL with a bulky organic cation (e.g., N-alkylpyridinium, N-N-dialkylimidazolium, alkylimidazolium, alkyl‐ phosphonium, and alkylammonium) is weakly coordinated to an organic or inorganic anion, such as BF4, Cl−, I−, AlCl4, PF6, NO3, CH3COO, CF3SO3, [(CF3SO2)2N], etc. to consti‐ tute a series of low melting ILs, as shown in Figure 1.
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