**3.5 Structural analysis of 1-(3,5-dimethylphenyl)-2-(4-fluorophenyl)- 4,5-dimethyl-1***H***-imidazole (DMPFPDMI)**

This section depicts the structure details of DMPFPDMI [14]. SHELXS97 [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: C19H19FN2; molecular weight: 294.36; crystal data: a = 8.4226 (10) Å; b = 9.5572 (10) Å; c = 11.0351 (11) Å; α = 105.423 (9)°; β = 105.677 (9)°; γ = 95.781

**Figure 7.** *The crystal packing with hydrogen bonds [21], viewed along the a-axis.*

(9)°; V = 810.07 (17) Å3 ; Z = 2; Dx = 1.207 Mg m<sup>3</sup> ; F(000) = 312; final R [F<sup>2</sup> > 2σ(F<sup>2</sup> )] = 0.052 & wR(F<sup>2</sup> ) = 0.159 for 2771 reflections observed with I > 2σ(I).

All of the H atoms admitted to riding on their parent atoms and were directed geometrically, with CdH = 0.95–0.98 Å; Uiso(H) = kUeq(C), where k = 1.5 for dCH3 and 1.2 for the other H atoms.

In this compound (**Figure 10**), with a maximum deviation of 0.0015 (9) Å for C4, the imidazole ring is planar. The imidazole ring makes dihedral angles of 77.61 (9) and 26.93 (10)° with the (C11dC16) and (C21dC26) rings, respectively. 78.84 (8)° is the dihedral angle among the (C11dC16) and (C21dC26) rings. A C12—H12π (x, y, z + 1) interaction involving the (C21dC26) ring stabilizes the crystal.

The ORTEP-3 for Windows drew the thermal displacement ellipsoid plot with a 30% probability level [20] (**Figure 10**).

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

**Figure 8.** *The thermal displacement ellipsoid plot [20] is shown at a 30% probability level.*

**Figure 9.** *The crystal packing with hydrogen bonds [21] is viewed along the b-axis.*

**Figure 10.** *The thermal displacement ellipsoid plot [20] is shown at a 30% probability level.*
