A Photoresponsive Smart Covalent Organic Framework |
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Authors: | Ning Huang Dr Xuesong Ding Dr Jangbae Kim Prof Dr Hyotcherl Ihee Prof Dr Donglin Jiang |
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Institution: | 1. Department of Materials Molecular Science, Institute for Molecular Science, National Institutes of Natural Sciences, 5‐1 Higashiyama, Myodaiji, Okazaki 444‐8787 (Japan);2. Present address: National Center of Nanoscience and Technology, No.11 ZhongGuanCun, BeiYiTiao, Beijing, 100190 (China);3. Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, KAIST, Daejeon 305‐701 (Republic of Korea) |
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Abstract: | Ordered π‐columnar structures found in covalent organic frameworks (COFs) render them attractive as smart materials. However, external‐stimuli‐responsive COFs have not been explored. Here we report the design and synthesis of a photoresponsive COF with anthracene units as the photoresponsive π‐building blocks. The COF is switchable upon photoirradiation to yield a concavo‐convex polygon skeleton through the interlayer 4π+4π] cycloaddition of anthracene units stacked in the π‐columns. This cycloaddition reaction is thermally reversible; heating resets the anthracene layers and regenerates the COF. These external‐stimuli‐induced structural transformations are accompanied by profound changes in properties, including gas adsorption, π‐electronic function, and luminescence. The results suggest that COFs are useful for designing smart porous materials with properties that are controllable by external stimuli. |
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Keywords: | anthracene covalent organic frameworks photoresponsive materials porous polymer smart materials |
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