2.2.3. DPA\_PA Salt for Characterization (PXRD, DSC, IR, and TG)

DPA (0.5 mmole) and PA (0.5 mmole) in a 1:1 molar ratio was grinded in a mortar and pestle for about 10 min to become a fine powder, then a few drops of acetone were added to it, then again grinded for 10–15 min to obtain powder. From this grinded material, 150 mg was used for the crystallization experiment. Colorless crystals were obtained on the side wall of the vial by upon dissolving the 150 mg grinded material in 20 mL acetone under sonication at a temperature 30 ◦C for 10 min; the resulting solution obtained after filtration was left for slow evaporation at ambient condition for 3–4 days.
