A Photoresponsive Surface Covalent Organic Framework: Surface‐Confined Synthesis,Isomerization, and Controlled Guest Capture and Release |
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| Authors: | Chunhua Liu Prof?Dr Wei Zhang Prof?Dr Qingdao Zeng Prof?Dr Shengbin Lei |
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| Institution: | 1. State Key Laboratory of Robotics and System (HIT), Harbin Institute of Technology, Harbin, P. R. of China;2. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, P. R. of China;3. CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing, P. R. of China;4. Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science & Collaborative Innovation, Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, P. R. of China |
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| Abstract: | By introducing an azobenzene group to the backbone of diboronic acid, we have obtained a surface‐confined, photoresponsive single‐layer covalent organic framework with long‐range order and almost entire surface coverage. Scanning tunneling microscopic characterization indicates that though the covalent linkage provides a significant locking effect, isomerization can still happen under UV irradiation, which causes destruction of the surface COF. Furthermore, the decomposed surface COF can recover upon annealing. This photoinduced decomposition provides a facile approach for the controlled capture and release of targeted objects using these nanoporous surface COFs as a host, which has been demonstrated in this work using copper phthalocyanine as a model guest. |
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| Keywords: | boronic acid condensation covalent organic frameworks (COFs) photoisomerization STM |
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