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Photostimulus‐Responsive Large‐Area Two‐Dimensional Covalent Organic Framework Films
Author(s) -
Yu Fei,
Liu Wenbo,
Li Bang,
Tian Dan,
Zuo JingLin,
Zhang Qichun
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201909613
Subject(s) - covalent bond , photochemistry , cyclopentene , chemistry , covalent organic framework , irradiation , diode , kinetics , visible spectrum , materials science , nanotechnology , optoelectronics , catalysis , organic chemistry , physics , quantum mechanics , nuclear physics
Using an external stimulus to modulate the electronic structure of covalent organic frameworks (COFs) is very important because such a response will endow them with additional functions. A two‐dimensional (2D) COF, constructed from a photo‐responsive unit (1,2‐bis(5‐formyl‐2‐methylthien‐3‐yl)cyclopentene), can reversibly switch its electrical conductivity 200 times from low state (the open form) to high state (the closed form) upon irradiation with UV light and reversible with visible light. This reversible phenomenon can be monitored through a circuit containing a light‐emitting diode (LED). Photoinduced ring‐closing/opening reactions do not destroy the integrity of the frameworks, and both processes follow logarithmic carrier generation with time. Moreover, the correlation between COFs electronic properties and changes in photoinduced kinetics and absorption curves has been demonstrated.