4-Amino-3,5-bis­(2-pyrid­yl)-4H-1,2,4-triazole–benzene-1,2,3-tricarboxylic acid–water (1/1/2)

Cocrystallization of 4-amino-3,5-bis­(2-pyrid­yl)-1,2,4-triazole (2-bpt) with hemimellitic acid (benzene-1,2,3-tricarboxylic acid) dihydrate (H(3)HMA·2H(2)O) produces the supra­molecular title compound, C(12)H(10)N(6)·C(9)H(6)O(6)·2H(2)O. Inter­molecular N—H⋯N hydrogen bonds are observed between the terminal pyridyl and amino groups of the 2-bpt molecule and the dihedral angles between the central ring and the pendant pyridine rings are 3.4 (7) and 13.8 (7)°. In the structure, homosynthons of graph set R (2) (2)(8) are observed to form centrosymmetric H(3)HMA dimers, which are extended into a two-dimensional supra­molecular layer via inter­molecular O—H⋯N and C—H⋯O hydrogen bonds and π–π stacking inter­actions [centroid–centroid distance = 3.541 (3) Å]. In addition, inter­layer uncoordinated water mol­ecules connect the layers through O—H⋯O hydrogen bonds, generating a three-dimensional network.