Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 2 (February 2013)

organic compounds

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-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 R22(16)]. The crystals studied were non-merohedrally twinned.

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