4,4'-Bipyridine-terephthalic acid (1/1)

3-Amino-benzoic acid-4,4'-bipyridine (2/3)

The asymmetric unit of the title compound, 3C₁₀H₈N₂·2C₇H₇NO₂, consists of three mol­ecules of 4,4′-bipyridine (bpy) and two mol­ecules of 3-amino­benzoic acid (bza). Two mol­ecules of bza and two mol­ecules of bpy are connected via O—H⋯N, N—H⋯N and N—H⋯O hydrogen bonds, forming forming infinite double-stranded zigzag chains along the c axis. The third mol­ecule of bpy is linked to the chain by weak C—H⋯O inter­actions. Adjacent chains are linked via π–π inter­actions [centroid–centroid distances = 3.759 (3)–3.928 (3) Å] involving the pyridine rings of bpy mol­ecules, resulting in a sheet-like structure parallel to (100). These sheets are stacked via C—H⋯π inter­actions, resulting finally in the formation of a three-dimensional supra­molecular structure.