Supramolecular interactions in the 2,6-bis(benzimidazol-2-yl)pyridine-terephthalic acid-water (2/1/4) cocrystal.

In the title compound, 2C(19)H(13)N(5).C(8)H(6)O(4).4H(2)O, the terephthalic acid molecule lies on a crystallographic inversion centre and the H atoms of one water molecule exhibit disorder. The maximum deviation of any atom from the mean plane through the C and N atoms of the 2,6-bis(benzimidazol-2-yl)pyridine molecule is only 0.161 (4) A. In the crystal structure, the water molecules play an important role in linking the other molecules via hydrogen bonding. The structure forms a three-dimensional framework via strong intermolecular hydrogen bonding. In addition, there are pi-pi stacking interactions between the imidazole, pyridine and benzene rings.