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In the title mol­ecular salt, C 12 H 12 N 2   2+ ·2C 7 H 5 O 5 S − , the complete dication is generated by crystallographic inversion symmetry. In the anion, the sulfonic acid group is deprotonated and the dihedral angle between the planes of the carb­oxy­lic acid group and the benzene ring is 12.41 (11)°. In the crystal, the anions are linked into inversion dimers by pairs of O—H⋯O hydrogen bonds, which generate  R   2   2 (16) loops. The dications link the anion dimers into [10-2] chains  via  N—H⋯O hydrogen bonds.

Crystal structure of 4,4′-(ethene-1,2-diyl)dipyridinium bis(3-carboxybenzenesulfonate)