Benzoic acid–4-{(1E)-[(E)-2-(pyridin-4-yl­methyl­idene)hydrazin-1-yl­idene]meth­yl}pyridine (2/1)

In the title co-crystal, C(12)H(10)N(4)·2C(7)H(6)O(2), the complete 4-pyridine­aldazine mol­ecule is generated by a crystallographic centre of inversion. In the crystal, mol­ecules are connected into a three component aggregate via O—H⋯N hydrogen bonds. As both the benzoic acid [O—C—C—C torsion angle = 174.8 (2)°] and 4-pyridine­aldazine (r.m.s. deviation of the 16 non-H atoms = 0.041 Å) mol­ecules are almost planar, the resulting three-component aggregate is essentially planar. The crystal packing comprises layers of the three-component aggregates of alternating orientation stacked along the b axis; the connections between the mol­ecules are of the types C—H⋯π and π–π [pyridine–benzene centroid–centroid distance = 3.787 (4) Å].