A centrosymmetric monoclinic polymorph of N (1),N (4)-bis­(pyridin-3-yl­methyl­idene)benzene-1,4-diamine

The complete molecule of the title compound, C(18)H(14)N(4), is generated by the application of a centre of inversion. The dihedral angle between the central benzene ring and the pyridine ring is 31.88 (7)°. In the crystal, mol­ecules are stacked in columns along the c axis and several inter­molecular π–π inter­actions are present between the six-membered rings, the shortest centroid–centroid distance being 3.937 (2) Å. The structure reported herein represents a centrosymmetric polymorph of the previously reported non-centrosymmetric (P2(1)) form [Kim et al. (2005 ▶). Bull. Korean Chem. Soc. 26, 892–898].