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The title mol­ecular salt, C7H9N2+.C8H7O3, was synthesized by reaction between benzamidine (benzene­carboximidamide) and 2-meth­oxy­benzoic acid. In the cation, the amidinium group has two similar C—N bonds [1.3070 (17) and 1.3145 (16) Å] and is almost coplanar with the benzene ring, making a dihedral angle of 5.34 (12)°. In the anion, the meth­oxy substituent forces the carboxyl­ate group to be twisted by 69.45 (6)° with respect to the plane of the aromatic fragment. In the crystal, the components are connected by two N+—H...O (±)CAHB (charge-assisted hydrogen bonds), forming centrosymmetric ionic dimers with graph-set motif R22(8). These ionic dimers are then joined in ribbons running along the b-axis direction by another R42(8) motif involving the remaining N+—H...O hydrogen bonds. Remarkably, at variance with the well known carb­oxy­lic dimer R22(8) motif, the carboxyl­ate–amidinium pair is not planar, the dihedral angle between the planes defined by the CN2+ and CO2 atoms being 18.57 (12)°.
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