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2018
Journal Article
Titel
Topochemical conversion of an imine- into a thiazole-linked covalent organic framework enabling real structure analysis
Abstract
Stabilization of covalent organic frameworks (COFs) by post-synthetic locking strategies is a powerful tool to push the limits of COF utilization, which are imposed by the reversible COF linkage. Here we introduce a sulfur-assisted chemical conversion of a two-dimensional imine-linked COF into a thiazole-linked COF, with full retention of crystallinity and porosity. This post-synthetic modification entails significantly enhanced chemical and electron beam stability, enabling investigation of the real framework structure at a high level of detail. An in-depth study by electron diffraction and transmission electron microscopy reveals a myriad of previously unknown or unverified structural features such as grain boundaries and edge dislocations, which are likely generic to the in-plane structure of 2D COFs. The visualization of such real structural features is key to understand, design and control structure-property relationships in COFs, which can have major implications for adsorption, catalytic, and transport properties of such crystalline porous polymers.
Author(s)
Haase, Frederik
Max-Planck-Institut für Festkörperforschung / Ludwig-Maximilians-Universität München
Savasci, Gökcen
Max-Planck-Institut für Festkörperforschung / Ludwig-Maximilians-Universität München
Project(s)
COFLeaf