Direct Synthesis of a Covalent Triazine‐Based Framework from Aromatic Amides

Abstract

There have been extensive efforts to synthesize crystalline covalent triazine-based frameworks (CTFs) for practical applications and to realize their potential. The phosphorus pentoxide (P₂ O₅ )-catalyzed direct condensation of aromatic amide instead of aromatic nitrile to form triazine rings. P₂ O₅ -catalyzed condensation was applied on terephthalamide to construct a covalent triazine-based framework (pCTF-1). This approach yielded highly crystalline pCTF-1 with high specific surface area (2034.1 m² g^-1 ). At low pressure, the pCTF-1 showed high CO₂ (21.9 wt % at 273 K) and H₂ (1.75 wt % at 77 K) uptake capacities. The direct formation of a triazine-based COF was also confirmed by model reactions, with the P₂ O₅ -catalyzed condensation reaction of both benzamide and benzonitrile to form 1,3,5-triphenyl-2,4,6-triazine in high yield.