Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 7 (July 2013)

organic compounds

Acta Cryst. (2013). E69, o1114-o1115    [ doi:10.1107/S1600536813016395 ]

Benzamidinium 2-meth­oxy­benzoate

G. Portalone

Abstract: 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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