Acta Cryst. (2013). E69, o206
[ doi:10.1107/S1600536813000093 ]

4-(4-Nitrobenzyl)pyridinium 3-carboxy-4-hydroxybenzenesulfonate

G. Smith and U. D. Wermuth

Abstract: In the title salt, C₁₂H₁₁N₂O₂⁺·C₇H₅O₆S^-, the dihedral angle between the benzene and pyridine rings in the 4-(4-nitrobenzyl)pyridinium cation is 82.7 (2)°. Within the anion there is an intramolecular hydroxy-O-HO(carboxylic acid) bond. In the crystal, the cation forms a single N⁺-HO_sulfonate hydrogen bond with the anion. These cation-anion pairs interact through duplex anion carboxylic acid O-HO_sulfonate hydrogen bonds, giving a centrosymmetric cyclic association [graph set R₂²(16)]. The crystals studied were non-merohedrally twinned.

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