In the title compound, C(18)H(12)Cl(2)N(2)O, the pyrazole ring is almost planar [r.m.s. deviation = 0.002 Å] while the two chloro-phenyl rings are twisted out from the plane of the pyrazole ring, making dihedral angles of 5.3 (1) and 65.34 (4)°. In the crystal, centrosymmetric R(2) (2)(24) dimers are formed about crystallographic inversion centres through a pair of C-H⋯Cl inter-actions. These dimers are further linked through a C-H⋯O hydrogen bond, forming a C(8) chain extending along the a axis. C-H⋯π inter-actions are also observed.

DOI: 10.1107/S1600536810035646

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@inproceedings{Susindran2010E34Chlorophenyl334chlorophenyl1H, title={(E)-3-(4-Chloro­phen­yl)-3-[3-(4-chloro­phen­yl)-1H-pyrazol-1-yl]prop-2-enal}, author={V. Susindran and Shanmuganarayanan Athimoolam and Swarnima Bahadur and Ramaiyan Manikannan and Shanmugam Muthusubramanian}, booktitle={Acta crystallographica. Section E, Structure reports online}, year={2010} }