化学
亚胺
共价有机骨架
共价键
组合化学
试剂
动态共价化学
有机化学
分子
催化作用
超分子化学
作者
Shaohua Yang,Chen Yang,Chaochao Dun,Haiyan Mao,Rebecca Shu Hui Khoo,Liana M. Klivansky,Jeffrey A. Reimer,Tracy M. Mattox,Jian Zhang,Yi Liu
摘要
Covalent organic frameworks (COFs) show great potential for many advanced applications on account of their structural uniqueness. To address the synthetic challenges, facile chemical routes to engineer the porosity, crystallinity, and functionality of COFs are highly sought after. Herein, we report a synthetic approach that employs the Cadogan reaction to introduce nitrogen-containing heterocycles as the linkages in the framework. Irreversible indazole and benzimidazolylidene (BIY) linkages are introduced into COFs for the first time via phosphine-induced reductive cyclization of the common imine linkages following either stepwise or one-pot reaction protocols. The successful linkage transformation introduces new functionalities, as demonstrated in the case of BIY-COF, which displays excellent intrinsic proton conductivity without the need of impregnation with external proton transfer reagents. Such a general strategy will open the window to a broader class of functional porous crystalline materials.
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