Cyanurate-Linked\nCovalent Organic Frameworks Enabled\nby Dynamic Nucleophilic Aromatic Substitution

Abstract

We report, for the first time, highly\ncrystalline cyanurate-linked\ncovalent organic frameworks synthesized via dynamic nucleophilic aromatic\nsubstitution. The high crystallinity is enabled by the bond exchange\nreaction (self-correction) between 2,4,6-triphenoxy-1,3,5-triazine\nand diphenols via reversible S_NAr catalyzed by triazabicyclodecene.\nThe CN-COFs contain flexible backbones that exhibit a unique AA′-stacking\ndue to interlayer hydrogen bonding interactions. The isoreticular\nexpansion study demonstrates the general applicability of this synthetic\nmethod. The resulting CN-COFs exhibited good stability, as well as\nhigh CO₂/N₂ selectivity.