2,2′-[(2,2′-Bipyridine-3,3′-di­yl)bis­(nitrilo­methyl­idyne)]diphenol

The title mol­ecule, C(24)H(18)N(4)O(2), lies on a twofold rotation axis with a dihedral angle of 73.7 (1)° between the mean planes of the symmetry-related pyridine rings. The dihedral angle between unique benzene and pyridine rings is 8.0 (1)°. An intra­molecular O—H⋯N hydrogen bond may influence the mol­ecular conformation. In the crystal structure, there are weak π–π stacking inter­actions with a centroid–centroid distance of 3.7838 (15) Å.