酰亚胺
溶剂热合成
结晶度
共价键
盐(化学)
材料科学
聚合物
多孔性
高分子化学
化学工程
有机化学
化学
工程类
复合材料
作者
Johannes Maschita,Tanmay Banerjee,Gökçen Savaşçı,Frederik Haase,Christian Ochsenfeld,Bettina V. Lotsch
标识
DOI:10.1002/anie.202007372
摘要
Abstract Covalent organic frameworks (COFs) are an extensively studied class of porous materials, which distinguish themselves from other porous polymers in their crystallinity and high degree of modularity, enabling a wide range of applications. COFs are most commonly synthesized solvothermally, which is often a time‐consuming process and restricted to well‐soluble precursor molecules. Synthesis of polyimide‐linked COFs (PI‐COFs) is further complicated by the poor reversibility of the ring‐closing reaction under solvothermal conditions. Herein, we report the ionothermal synthesis of crystalline and porous PI‐COFs in zinc chloride and eutectic salt mixtures. This synthesis does not require soluble precursors and the reaction time is significantly reduced as compared to standard solvothermal synthesis methods. In addition to applying the synthesis to previously reported imide COFs, a new perylene‐based COF was also synthesized, which could not be obtained by the classical solvothermal route. In situ high‐temperature XRPD analysis hints to the formation of precursor–salt adducts as crystalline intermediates, which then react with each other to form the COF.
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