Received 20 December 2012
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+-HOsulfonate hydrogen bond with the anion. These cation-anion pairs interact through duplex anion carboxylic acid O-HOsulfonate hydrogen bonds, giving a centrosymmetric cyclic association [graph set R22(16)]. The crystals studied were non-merohedrally twinned.
For data on 4-(4-nitrobenzyl)pyridine adduct and salt structures, see: Smith et al. (1997); Smith & Wermuth (2010). For examples of the structures of salts of 5-sulfosalicylic acid, see: Raj et al. (2003); Smith et al. (2004). For graph-set analysis of hydrogen bonds, see: Etter et al. (1990).
Data collection: CrysAlis PRO (Agilent, 2012); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008) within WinGX (Farrugia, 2012); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: PLATON.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BH2470 ).
The authors acknowledge financial support from the Australian Research Council, the Science and Engineering Faculty and the University Library, Queensland University of Technology.
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