7,8-Bis(pyridinium-2-ylthio)-7,8-dicarba-nido-undecaborate Trifluoromethanesulfonate

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 H...H steric interactions between pyridinium and carborane. Hydrogen bonds of the form N—H...O link two anions and two cations over an inversion centre.

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