4-[(E)-2-(Pyridin-2-yl)ethenyl]pyridine–terephthalic acid (2/1)

The title 2:1 co-crystal, 2C12H10N2·C8H6O4, crystallizes with one molecule of 4-[(E)-2-(pyridin-2-yl)ethenyl]pyridine (A) and one half-molecule of terephthalic acid (B) in the asymmetric unit. In the crystal, the components are linked through heterodimeric COOH...Npyridine synthons, forming linear aggregates of composition –A–B–A–B–. Further linkage through weak C—H...O and C—H...π interactions gives two-dimensional hydrogen-bonded undulating sheets propagating in the [100] and [010] directions. These layers are connected through additional weak C—H...O contacts, forming a three-dimensional structure.