Release date:2021/9/17 11:27:22
We report the synthesis of crystalline two-dimensional covalent organic frameworks (COFs) by connecting
hydroxybenzene-aldehyde and acetonitrile building blocks to form cyano-substituted benzofuran linkages. Unlike the majority of
COFs that were synthesized based on condensation reactions, the COFs in this report are crystallized from irreversible cascade
reactions involving consecutive cyanide migration, ring-closure, and oxidation reactions. The irreversible property endows the COFs
with high chemical stability in both acid and base and allows them to be postsynthetically modifified to install predesigned
functionality under harsh conditions. We highlight that the functionalized COFs serve as exceptional vehicles for superprotonic

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