Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 30, Pages 8704-8707Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201503902
Keywords
anthracene; covalent organic frameworks; photoresponsive materials; porous polymer; smart materials
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (Japan) (MEXT) [24245030]
- [IBS-R004-G2]
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Ordered -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 -building blocks. The COF is switchable upon photoirradiation to yield a concavo-convex polygon skeleton through the interlayer [4+4] cycloaddition of anthracene units stacked in the -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, -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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