Topochemical conversion of an imine- into a thiazole-linked covalent organic framework enabling real structure analysis
| Autor: | Christian Ochsenfeld, Viola Duppel, Susanne Dörfler, Stefan Kaskel, Asbjörn M. Burow, Bettina V. Lotsch, Frederik Haase, Erik Troschke, Gökcen Savasci, Tanmay Banerjee, Martin M. J. Grundei |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Science Imine General Physics and Astronomy 02 engineering and technology Real structure 010402 general chemistry 01 natural sciences Article General Biochemistry Genetics and Molecular Biology chemistry.chemical_compound Crystallinity lcsh:Science chemistry.chemical_classification Multidisciplinary General Chemistry Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Electron diffraction chemistry Chemical engineering Covalent bond lcsh:Q Grain boundary 0210 nano-technology Covalent organic framework |
| Zdroj: | Nature Communications Nature Communications, Vol 9, Iss 1, Pp 1-10 (2018) |
| ISSN: | 2041-1723 |
| Popis: | 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. Stabilization of covalent organic frameworks (COFs) by post-synthetic locking is a powerful tool to push the limits of COF utilization. Here the authors demonstrate a sulfur-assisted conversion of an imine-linked COF into a thiazole-linked COF, with retention of crystallinity and porosity, allowing for direct imaging of defects in COFs. |
| Databáze: | OpenAIRE |
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