Graham Smith, U. Wermuth
Jan 9, 2013
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Journal
Acta Crystallographica Section E: Structure Reports Online
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—H⋯O(carboxylic acid) bond. In the crystal, the cation forms a single N+—H⋯Osulfonate hydrogen bond with the anion. These cation–anion pairs interact through duplex anion carboxylic acid O—H⋯Osulfonate hydrogen bonds, giving a centrosymmetric cyclic association [graph set R 2 2(16)]. The crystals studied were non-merohedrally twinned.