Crystal structure of 4-hy­droxy­pyridin-1-ium 3,5-di­carb­oxy­benzoate

The structure of the title salt, C(5)H(6)NO(+)·C(9)H(5)O(6) (−), (I), shows that 4-hy­droxy­pyridine has abstracted an H atom from benzene-1,3,5-tri­carb­oxy­lic acid, yielding a pyridinium cation and carboxyl­ate anion. The two ions form an extensive three-dimensional hydrogen-bonded network throughout the crystal. The hydrogen bonds that comprise the core of the network are considered strong, with O—H⋯O and N—H⋯O donor-to-acceptor distances ranging from 2.533 (2) to 2.700 (2) Å. Packing is further enhanced by π-stacking of the cations and anions with like species [centroid–centroid distance = 3.6206 (13) Å].