化学
结晶度
亚胺
共价有机骨架
苯并恶唑
共价键
热稳定性
聚合物
化学稳定性
芳香性
高分子化学
光化学
有机化学
化学工程
分子
结晶学
工程类
催化作用
作者
Jungyun Seo,Hyuk‐Jun Noh,Hu Young Jeong,Jong‐Beom Baek
摘要
Efficiently converting unstable linkages into stable linkages is an important objective in the chemistry of covalent organic frameworks (COFs), because it enhances stability and preserves crystallinity. Here, an unstable imine-linked COF was converted into a stable aromatic benzoxazole-linked COF (BO-COF) via post-oxidative cyclization, based on chemistry used to form fused-aromatic ladder-like rigid-rod polymers. The structure of the porous BO-COF was confirmed by transmission electron microscopy, infrared and solid-state nuclear magnetic resonance spectroscopies, powder X-ray diffraction patterns, and nitrogen adsorption-desorption isotherms. The efficient post-treatment of an unstable reversible COF converted it into a stable irreversible COF, which had significantly improved thermal and chemical stabilities as well as high crystallinity. This strategy can be universally applied for the synthesis of stable fused-aromatic COFs, expanding their practical applications.
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