Acta Cryst. (2013). E69, o94-o95 [ doi:10.1107/S1600536812050374 ]
Abstract: The 4-methylbenzoate anion of the title salt, C6H9N2+·C8H7O2-, is nearly planar, with a dihedral angle of 6.26 (10)° between the benzene ring and the carboxylate group. In the crystal, the protonated N atom and the 2-amino group of the cation are hydrogen bonded to the carboxylate O atoms of the anion via a pair of N-HO hydrogen bonds with an R22(8) ring motif, forming an approximately planar ion pair with a dihedral angle of 9.63 (4)° between the pyridinium and benzene rings. The ion pairs are further connected via N-HO and weak C-HO hydrogen bonds, forming a two-dimensional network parallel to the bc plane.
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