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A series of 1-methyl-3-polyfluoroalkylimidazolium fluorohydrogenate salts (C 3F3 MIm(FH) 1.7 F, C 4F5 MIm(FH) 1.7 F, C 6F9 MIm(FH) 1.8 F, C 8F13 MIm(FH) 2.0 F, and C 10F17 MIm(FH) 2.0 F; the subscript numbers denote the number of carbon and fluorine atoms in the side-chain, respectively, with which the two carbon atoms...