fig3

Figure 3. Stability test of 2D COFs and CPOF-4-265 °C-84 h. Effect of solvent activation on (A-C) 2D COF structure and (D and E) CL-COF structure; (F) PXRD patterns of CPOF-4 after solvent treatments under different chemical environments for 24 h; (G) PXRD patterns of CPOF-4-265 °C-84 h after treatments under different chemical environments for 24 h. COFs: Covalent organic frameworks; CL-COF: crystalline cross-linked covalent organic framework; PXRD: powder X-ray diffraction.