2-Aminobenzoic acid-4,4 '-bipyridine (2/1)

The asymmetric unit of title co-crystal, C10H8N2 center dot 2C(7)H(7)NO(2), comprises a centrosymmetric 4,40-bipyridine molecule, and a 2-aminobenzoic acid molecule in a general position. The latter is effectively planar [C-C-C-O torsion angle = 5.0 (3)degrees] owing to an intramolecular N-H center dot center dot center dot O(carbonyl) hydrogen bond. Three-molecule aggregates are formed via OH center dot center dot center dot N(pyridyl) hydrogen bonds and these are connected into supramolecular layers in the bc plane by N-H center dot center dot center dot O(carbonyl) hydrogen bonds and pi-pi interactions between pyridyl and benzene rings [inter-centroid distance = 3.634 (2) angstrom]. Layers are connected along the a axis by weak pi-pi interactions between benzene rings [3.964 (2) angstrom].