Fig. 4 | Nature Communications

Fig. 4

From: Facile transformation of imine covalent organic frameworks into ultrastable crystalline porous aromatic frameworks

Fig. 4

Chemical stability of MF-1a and COF-1. PXRD patterns of MF-1a (a) and COF-1 (b) after treatment with 12 M HCl at 50 °C for 8 h (green), 98% triflic acid at ambient temperature for 3 days (black), 14 M NaOH in H2O/MeOH solution at 60 °C for 1 day (red), 5 equiv. of NaBH4 in MeOH at 65 °C for 1 day (blue), and 5 equiv. of KMnO4 in H2O/CH3CN solution at ambient temperature for 1 day (purple)

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