Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 12, Issue 8, Pages 1649-1658Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b921462n
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Ionic liquids (ILs) are ambient temperature molten salts that have attracted considerable attention because of their negligible volatility, thermal stability, nonflammability, and high ionic conductivity. These remarkable properties result essentially from their ionic nature. Thus, the concept of ionicity of ILs (i.e. how ionic they are) is of great significance for characterising their properties. Here, we show the methodologies used to assess the ionic nature in ILs. On the basis of quantitative estimation of the ionicity, their dependence on ionic structure, polarity scales, and physicochemical properties is reviewed. The ionicity of certain ILs is also predicted from their physicochemical properties. The effects of different classes of ILs (e.g., protic ILs and lithium ILs) and binary systems consisting of ILs and other components on the ionicity are also discussed.
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