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organic compounds
In the title compound, C12H20B9N2S2+.CF3SO3−, the open B3C2 face of the carborane contains three terminal H atoms and one bridging B—H—B unit, with B—H distances of 1.12 (3) and 1.39 (3) Å. The S—C—C/N angles to the pyridinium groups differ appreciably, possibly because of HH steric interactions between pyridinium and carborane. Hydrogen bonds of the form N—HO link two anions and two cations over an inversion centre.