4-Amino­pyridinium 4-nitro­benzoate 4-nitro­benzoic acid

The asymmetric unit of the title compound, C(5)H(7)N(2) (+)·C(7)H(4)NO(4) (−)·C(7)H(5)NO(4), consists of an amino­pyridinium cation, a 4-nitro­benzoate anion and a neutral 4-nitro­benzoic acid mol­ecule. The pyridine ring forms dihedral angles of 64.70 (5)° and 70.37 (5)°, respectively, with the benzene rings of 4-nitro­benzoic acid and 4-nitro­benzoate. In the crystal structure, the cations, anions and the neutral 4-nitro­benzoic acid mol­ecules are linked by O—H⋯O and N—H⋯O hydrogen bonds, forming a two-dimensional network parallel to (001). Adjacent networks are cross-linked via C—H⋯O hydrogen bonds and π–π stacking inter­actions [centroid–centroid distances 3.6339 (6) and 3.6566 (6) Å].