**3.8 Structural analysis of 2-(4-fluorophenyl)-1,4,5-triphenyl-1***H***-imidazole (FPTPI)**

This section depicts the structure details of FPTPI [17]. SHELXS86 [19] solved the crystal structure. The program SHELXL97 [19] refines the final crystal structure model.

This compound belongs to the triclinic crystal system with the space group Pī. Molecular formula: C27H19FN2; molecular weight: 390.44; crystal data: a = 10.1794 (5) Å; b = 10.5239 (6) Å; c = 10.6175 (6) Å; α = 80.750 (5)°; β = 85.776 (4)°; γ = 67.348 (5)°; V = 1035.95 (11) Å<sup>3</sup> ; Z = 2; Dx = 1.252 Mg m<sup>3</sup> ; F(000) = 408; final R

[F<sup>2</sup> > 2σ(F2 )] = 0.049 and wR(F<sup>2</sup> ) = 0.128 for 3489 reflections observed with I > 2σ(I). All the H atoms were directed geometrically and admitted to riding on their parent atoms with CdH = 0.93 Å and Uiso(H) = 1.2Ueq (parent atom).

*Selected Imidazole Derivatives: Synthesis and X-Ray Crystal Structure – A Review DOI: http://dx.doi.org/10.5772/intechopen.108488*

**Figure 13.** *The thermal displacement ellipsoid plot [20] is shown at a 30% probability level.*

In **Figure 13**, the imidazole ring is planar with a maximum deviation = 0.004 (1) Å for N1. The dihedral angles made by the imidazole ring with the (C11dC16), (C21dC26), (C41dC46), and (C51dC56) rings are 62.80 (6), 36.98 (6), 33.16 (6) and 46.24 (6)°, respectively. The dihedral angles made by the (C11dC16) ring are 54.26 (6), 85.21 (7), and 65.02 (6) ° with the fluorophenyl, (C41dC46) and (C51dC56) rings attached to C4 and C5, respectively. The (C41dC46) ring makes the dihedral angle of 51.10 (6)° with the (C51dC56) ring. The crystal exhibits no conventional hydrogen bond interactions.

The ORTEP-3 for Windows drew the thermal displacement ellipsoid plot with a 30% probability level [20] (**Figure 13**).
