Summary: | The asymmetric unit of the title compound, C8H6F3N2+·0.5C10H6O6S22−, consists of one 2-trifluoromethyl-1H-benzimidazol-3-ium cation and a half naphthalene-1,5-disulfate anion, which are linked by an N—H...O hydrogen bond. The anion sits across a centre of symmetry. The atoms of the benzimidazole ring are nearly coplanar (r.m.s. deviation of the fitted atoms = 0.0085 Å) and the triflouromethyl group lies out of this plane. In the crystal, the cations are linked to adjacent anions by N—H...O hydrogen bonds, forming a ladder structure parallel to the a axis in which the anions form the rungs. Adjacent ladders are linked by weak C—H...O interactions, forming sheets parallel to the ac plane.
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