**2.5 Synthesis of 1-(3,5-dimethylphenyl)-2-(4-fluorophenyl)-4,5-dimethyl-1***H***imidazole (C19H19FN2): DMPFPDMI**

15 mmol of 3,5-xylidine, 15 mmol of ammonium acetate, and 15 mmol of 4 fluorobenzaldehyde were added to 15 mmol of pure butane-2,3-dione in 10 ml of ethanol for about 1 hour at a constant temperature of 333 K. The remaining procedure is followed as given in DMDPIMH. The yield was 2.1 g or 48% (**Figure 1**). Crystals suitable for X-ray diffraction studies were developed by slow solvent evaporation using dichloromethane [14].
