Premium
A Photoresponsive Smart Covalent Organic Framework
Author(s) -
Huang Ning,
Ding Xuesong,
Kim Jangbae,
Ihee Hyotcherl,
Jiang Donglin
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201503902
Subject(s) - anthracene , covalent bond , cycloaddition , materials science , adsorption , covalent organic framework , smart material , luminescence , porosity , polymer , yield (engineering) , nanotechnology , chemical engineering , photochemistry , chemistry , optoelectronics , composite material , organic chemistry , catalysis , engineering
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.