Acta Cryst. (2014). E70, o600-o601
[ doi:10.1107/S1600536814008587 ]
Abstract: In the asymmetric unit of the title salt, C6H9N2+·C7H7O3S-, there are two independent 2-amino-6-methylpyridinium cations and two independent 4-methylbenzenesulfonate anions. Both cations are protonated at their pyridine N atoms and their geometries reveal amine-imine tautomerism. In the 4-methylbenzenesulfonate anions, the carboxylate groups are twisted out of the benzene ring planes by 88.4 (1) and 86.2 (2)°. In the crystal, the sulfonate O atoms of an anion interact with the protonated N atoms and the 2-amino groups of a cation via a pair of N-HO hydrogen bonds, forming an R22(8) ring motif. These motifs are connected via N-HO hydrogen bonds, forming chains running along the a-axis direction. Within the chains there are weak C-HO hydrogen bonds present. In addition, aromatic - stacking interactions [centroid-centroid distances = 3.771 (2), 3.599 (2), 3.599 (2) and 3.497 (2) Å] involving neighbouring chains are also observed.
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