Fig. 2. (a) Synthetic scheme of TpASH and COF-HNU9. (b) PXRD patterns of TpASH and COF-HNU9. The first peak in the PXRD pattern is retained after post-synthetic modification signifying its structural integrity. (c) Views of the layered 2D-crystal structure of TpASH resulting from an eclipsed AA stacking model. (d) Nitrogen absorption curves of TpASH and COF-HNU9 at 77 K. (e) TEM image of COF-HNU9 before visible light irradiation.