Figure 1.
(a) 1-Ethyl-3-methylimidazolium tetrafluoroborate [EMIM][BF4], (b) 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM][BF4] and (c) 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide [EMIM][TF2N].
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