Experimental

disorder in main residue; R factor = 0.061; wR factor = 0.145; data-to-parameter ratio = 17.5. There are two independent molecules in the asymmetric unit of the title compound, C16H11Cl2FO2. The F atom equally populates both meta positions of the 6-dichloro-3-fluoro-phenyl ring in each molecule, resulting in 0.5 occupancy for both the F and H atoms in these positions. The dihedral angle between the mean planes of the benzene rings are 77.5 (2) and 89.8 (8)in the two molecules. In the crystal, weak C—H F and C—H O interactions involving the half-occupied H and F atoms are observed. Weak – stacking interactions [centroid—centroid distance = 3.150 (2) Å] also contribute to the crystal stability. Related literature For the pharmacological importance of chalcones, see