**3.7 Structural analysis of 1-(3,5-dimethoxyphenyl)-2-(4-fluorophenyl)- 4,5-dimethyl-1***H***-imidazole (DMOPFPDMI)**

This section depicts the structure details of DMOPFPDMI [16]. SHELXS97 [19] solved the crystal structure. The program SHELXL97 [19] refines the final crystal structure model.

This compound belongs to the monoclinic crystal system with the space group P21/ n. Molecular formula: C19H19FN2O2; molecular weight: 326.36; crystal data: a = 6.9654 (1) Å; b = 17.8520 (3) Å; c = 13.7121 (3) Å; β = 97.833 (2)°; V = 1689.14 (5) Å<sup>3</sup> ; Z = 4; Dx = 1.283 Mg m<sup>3</sup> ; F(000) = 688; final R[F2 > 2σ(F<sup>2</sup> )] = 0.046 and wR(F<sup>2</sup> ) = 0.138 for 2723 reflections observed with I > 2σ(I).

The H atoms were all geometrically directed, with CdH = 0.93–0.96 Å; Uiso(H) = kUeq(C), where k = 1.5 for dCH3 and 1.2 for the remaining H atoms. All of the H atoms are acknowledged to ride on their parent atoms.

In this compound, in **Figure 12**, with a maximum deviation of 0.0030 (8) Å for C4, the imidazole ring is planar. The imidazole ring makes dihedral angles of 66.45 (7) and 29.98 (7)° with the (C11dC16) and (C21dC26) rings, respectively. The dihedral angle among the benzene rings is 64.79 (7)°. A C23dH23⋯π (x 1/2, y + 1/2, z 1/2) interaction involving the imidazole (N1/C2/N3/C4/C5) ring is

#### **Figure 12.**

*The thermal displacement ellipsoid plot [20] is shown at a 30% probability level. The minor component of* d*O*d*CH3 and F atoms was omitted for clarity.*

found in the crystal structure. The dOdCH3 groups were disordered [occupancy factors: 0.803 (4) & 0.197 (4)]. The F atom is disordered [occupancy factors: 0.929 (4) & 0.071 (4)].

The ORTEP-3 for Windows drew the thermal displacement ellipsoid plot with a 30% probability level (**Figure 12**) [20].
