Acta Cryst. (2012). E68, o3196-o3197 [ doi:10.1107/S1600536812043243 ]
Abstract: In the 2-aminobenzoate anion of the title salt, C6H9N2+·C7H6NO2-, an intramolecular N-HO hydrogen bond is observed. The dihedral angle between the ring and the CO2 group is 8.41 (13)°. In the crystal, the protonated N atom and the 2-amino group of the cation are hydrogen bonded to the carboxylate O atoms via a pair of N-HO hydrogen bonds, forming an R22(8) ring motif. The ion pairs are further connected via N-HO hydrogen bonds, resulting in a donor-donor-acceptor-acceptor (DDAA) array of quadruple hydrogen bonds. The crystal structure also features a weak N-HO hydrogen bond and a C-H interaction, resulting in a three-dimensional network.
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