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The cation of the imidazolium-based ionic-liquid title salt, C 16 H 24 N 42+ ·2C 2 F 6 NO 4 S 2− , lies on a center of inversion; in the cation, the five-membered imidazolium ring is aligned at 84.4 (1)° with respect to the phenyl­ene ring; the angle at the methyl­ene C atom is 113.0 (2)°. In the anion, the negative charge formally resides on the two-coordinate N atom; the S—N—S angle at this atom is 125.2 (1)°.

1,1′,2,2′-Tetramethyl-3,3′-(p-phenylenedimethylene)diimidazol-1-ium bis[bis(trifluoromethylsulfonyl)imide]