Date Published: May 01, 2012
Publisher: International Union of Crystallography
Author(s): Jose J. Campos-Gaxiola, Simón Hernández-Ortega, David Morales-Morales, Adriana Cruz Enríquez.
In the title organic salt, C5H7N2+·C8H5O4−, the carboxylic group is nearly coplanar with the benzene ring [dihedral angle 1.9 (4)°] whereas the carboxylate group is twisted relative to the benzene ring by 13.6 (4)°. In the crystal, N-H⋯O and O—H⋯O hydrogen bonds connect the components into a three-dimensional framework consisting of stacks of alternating pairs of anions and cations exhibiting π–π stacking interactions with centroid–centroid distances in the range 3.676 (2)–3.711 (1) Å. The π–π stacks extend along  and [-110].
For background to crystal engineering with carboxylic acids and pyridine, see: Aakeröy & Salmon (2005 ▶); Almarsson & Zaworotko (2004 ▶); Mohamed et al. (2009 ▶); Sarma et al. (2009 ▶).