(2E)-1-(4,4′′-Difluoro-5′-methoxy-1,1′:3′,1′′-terphenyl-4′-yl)-3-(2-fluorophenyl)prop-2-en-1-one

In the title compound, C28H19F3O2, the central benzene ring forms dihedral angles of 48.69 (6), 60.93 (6) and 42.06 (6)° with the fluorobenzene rings. In the crystal, intermolecular C—H⋯O and C—H⋯F hydrogen bonds link the molecules, forming an undulating two-dimensional network parallel to the bc plane. C—H⋯π interactions further consolidate the crystal packing.

In the title compound, C 28 H 19 F 3 O 2 , the central benzene ring forms dihedral angles of 48.69 (6), 60.93 (6) and 42.06 (6) with the fluorobenzene rings. In the crystal, intermolecular C-HÁ Á ÁO and C-HÁ Á ÁF hydrogen bonds link the molecules, forming an undulating two-dimensional network parallel to the bc plane. C-HÁ Á Á interactions further consolidate the crystal packing.

Comment
In continuation of our work on synthesis of terphenyl chalcones (Fun et al., 2011), the title compound is prepared and its crystal structure is reported. The starting material of the title compound was prepared from 4,4′-difluoro chalcone by several steps (Fun, Hemamalini et al., 2012).

Refinement
All the H atoms were positioned geometrically and were refined with a riding model with U iso (H) = 1.2 or 1.5 U eq (C) (C -H = 0.95 or 0.98 Å). A rotating group model was applied to the methyl group. In the final refinement, one outliner (-13 1 30) was omitted.  The molecular structure of the title compound, showing 50% probability displacement ellipsoids.

Figure 2
The crystal packing of the title compound, viewed along the c axis, showing the undulating two-dimensional network parallel to the bc plane. H atoms not involved in the intermolecular interactions (dashed lines) have been omitted for clarity.

(2E)-1-(4,4′′-Difluoro-5′-methoxy-1,1′:3′,1′′-terphenyl-4′-yl)-3-(2-fluorophenyl)prop-2-en-1-one
Crystal data Special details Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1) K. Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. 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.