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Acta Cryst. (2014). E70, o600-o601
[ doi:10.1107/S1600536814008587 ]

2-Amino-6-methyl­pyridinium 4-methyl­benzene­sulfonate

K. S. S. Babu, M. Dhavamurthy, M. NizamMohideen, G. Peramaiyan and R. Mohan

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-H...O hydrogen bonds, forming an R22(8) ring motif. These motifs are connected via N-H...O hydrogen bonds, forming chains running along the a-axis direction. Within the chains there are weak C-H...O hydrogen bonds present. In addition, aromatic [pi]-[pi] 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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