(E)-3-(4-Chlorophenyl)-3-[3-(4-chlorophenyl)-1H-pyrazol-1-yl]prop-2-enal

Abstract

In the title compound, C18H12Cl2N 2O, 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 R22(24) dimers are formed about crystallographic inversion centres through a pair of C - H⋯Cl interactions. 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 interactions are also observed.