Spectroscopic and computational analysis reveals high proton conductivity in an equimolar N-methylimidazole and acetic acid mixture, suggesting a distinct class of pseudo-protic ionic liquids.
Liquids with no ions! Raman analysis and quantum calculations suggest that electrically neutral molecular species predominantly exist in an N-methylimidazole and acetic acid equimolar mixture, and that ionic species are rather minor. Nevertheless, the mixture has significant ionic conductivity, and shows "good ionic" or "superionic" behavior (see figure). It may be suitable to call such liquids "pseudo-ionic liquids" rather than "ionic liquids".
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Doi et al. (2013) studied this question.
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