Acta Cryst. (2008). E64, o1722-o1723  [ doi:10.1107/S1600536808024926 ]

N,N'-Bis[2-chloro-5-(trifluoromethyl)benzylidene]ethane-1,2-diamine

H.-K. Fun and R. Kia

Abstract: The molecule of the title Schiff base compound, C₁₈H₁₂Cl₂F₆N₂, adopts an E configuration with respect to the azomethine C=N bond. Intramolecular C-HF (× 2) and C-HCl (× 2) hydrogen bonds generate S(5) ring motifs. The imino group is coplanar with the aromatic ring. Within the molecule, the planar units are parallel, but extend in opposite directions from the methylene bridge, as indicated by the dihedral angle between the two benzene rings of 3.74 (6)°. The interesting features of the crystal structure are weak intermolecular ClN and FF interactions, with distances of 2.9192 (11) and 3.2714 (10) Å, respectively, which are shorter than the sum of the van der Waals radii of the relevent atoms. These interactions link neighbouring molecules into dimers which are stacked down the b axis.

Online 9 August 2008

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