2-Bromo-1,3-bis-(4-chloro-phen-yl)prop-2-en-1-one.

In the title compound, C(15)H(9)BrCl(2)O, the two benzene rings are twisted from each other with a dihedral angle of 47.33 (8)°. The crystal structure is stabilized by aromatic π-π inter-actions between the benzene rings of neighbouring mol-ecules [centroid-centroid distance = 3.680 (2) Å], and by weak inter-molecular C-H⋯O and C-H⋯Cl inter-actions. Additionally, the crystal structure exhibits a short intra-molecular C-H⋯Br contact (H⋯Br = 2.69 Å).

In the title compound, C 15 H 9 BrCl 2 O, the two benzene rings are twisted from each other with a dihedral angle of 47.33 (8) .The crystal structure is stabilized by aromaticinteractions between the benzene rings of neighbouring molecules [centroid-centroid distance = 3.680 (2) A ˚], and by weak intermolecular C-HÁ Á ÁO and C-HÁ Á ÁCl interactions.Additionally, the crystal structure exhibits a short intramolecular C-HÁ Á ÁBr contact (HÁ Á ÁBr = 2.69 A ˚).

Experimental
Crystal data

S1. Comment
As part of our ongoing investigations of chalcone derivatives as possible non-linear optical materials (Harrison et al., 2006), we now report the synthesis and structure of the noncentrosymmetric title compound, (I), (Fig 1 .).

S3. Refinement
The H atoms were placed in calculated positions (C-H = 0.95 Å) and refined as riding with U iso (H) = 1.2U eq (C).The highest difference peak is 0.96Å from O1.

sup-2
Acta Cryst. (2009).E65, o2648 Refinement.Refinement of F 2 against ALL reflections.The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 .The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement.R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.

Figure 1
Figure 1View of the molecular structure of (I) showing 50% displacement ellipsoids.The H atoms are drawn as spheres of arbitrary radius.