Acta Cryst. (2009). E65, o682-o683  [ doi:10.1107/S1600536809007284 ]

4,4'-[Ethylenebis(nitrilomethylidyne)]dibenzonitrile

R. Kia, H.-K. Fun and H. Kargar

Abstract: The molecule of the title Schiff base compound, C₁₈H₁₄N₄, lies across a crystallographic inversion centre and adopts an E configuration with respect to the azomethine (C=N) bonds. The imino groups are coplanar with the aromatic rings with a maximum deviation of 0.1574 (12) Å for the N atom. Within the molecule, the planar units are parallel, but extend in opposite directions from the dimethylene bridge. In the crystal structure, pairs of intermolecular C-HN hydrogen bonds link neighbouring molecules into centrosymmetric dimers with R²₂(10) ring motifs. An interesting feature of the crystal structure is the short intermolecular CC interaction with a distance of 3.3821 (13) Å, which is shorter than the sum of the van der Waals radius of a carbon atom.

Online 6 March 2009

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