fig2

Figure 2. Mechanism of structural preservation via solvent exchange. (A) Fluorescence spectrum of PCN-128, PCN-128-pressed, and H₄ETTC; (B) Schematic diagram of solvent-framework interactions and images of PCN-128 (under UV); (C) Emission spectrum (excitation: 365 nm) of PCN-128 film drying from DMF and THF; (D) PXRD patterns of PCN-128 and PCN-128-pressed; (E) N₂ adsorption isotherms of PCN-128 and PCN-128-pressed measured at 77 K; (F) PXRD pattern of DMF-dried and THF-dried PCN-128 recorded from 90 to 290 °C; (G) N₂ adsorption isotherms of DMF-dried and THF-dried PCN-128; (H) PXRD patterns of DMF-dried and THF-dried PCN-128. DMF: Dimethylformamide; THF: tetrahydrofuran; PXRD: powder X-ray diffraction.