Compound A was purified by crystallization from methanol, and after multiple recrystallizations diffraction quality red color crystals were harvested from the same solvent. Further screening in different solvents afforded three polymorphs concomitantly from methanol solvent as well as a fourth high-temperature polymorph. Studies on compounds B and C are ongoing, but with similar efforts at crystallization, we have so far obtained a single-crystal structure only for the bromo and iodo salicylideneanilines (no polymorphism). The subsequent discussion is on the structures and properties of chloro compound A. Polymorphs of A in bulk quantity (several mg up to g) were obtained by different techniques, such as Form I by rotary evaporation, Form II from slurry in methanol, and Form III from acetone at 80°C in a sealed tube (Fig. 1 ▸). The preliminary observations in this study were done on a hot stage microscope (HSM). Upon heating Form I crystals to about 170–180°C, a few crystals were seen to suddenly fly off from the stage (about 2–3 cm height) and they moved outside of the camera zone (Fig. 2 ▸ a). Form II crystals showed sudden blasting (mini explosion, Fig. 2 ▸ b) at 180°C, and Form III crystals behaved similar to those of Form I in that they were flying off suddenly from the hot stage at 180–190°C.