Fig. 4: Facile preparation of powder of D6H porous crystals.

a Schematic illustration showing the preparation of single crystals of racemic D6H via slow solvent diffusion and the facile preparation of powder of small crystals of racemic D6H via fast rotary evaporation. b, c Corresponding SEM images and PXRD (Cu Kα radiation, λ = 1.54178 Å) patterns. d TGA curves of the powder of racemic D6H dried from CH2Cl2 before and after activation (scan rate = 10 °C/min) and SEM image of the activated powder.