The COF-1 experimental PXRD pattern changes considerably after solvent evacuation (Figure ). The 6-10° peak becomes the most intensive one and a wide peak forms around 2θ=27°. This matches well our simulated AA stat PXRD pattern, which only lacks asymmetry of the main Thus, COF-1 transforms from ABCe/s to AAs stacking during solvent removal, likely because that the needed 1D pores for solvent diffusion are lacking in ABCe/s stacked COF-1 (Figure ).