Yu Fei, Liu Wenbo, Li Bang, Tian Dan, Zuo Jing-Lin, Zhang Qichun
School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, China.
Angew Chem Int Ed Engl. 2019 Nov 4;58(45):16101-16104. doi: 10.1002/anie.201909613. Epub 2019 Sep 20.
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.
利用外部刺激来调节共价有机框架（COF）的电子结构非常重要，因为这种响应将赋予它们额外的功能。一种由光响应单元（1,2-双（5-甲酰基-2-甲基噻吩-3-基）环戊烯）构建的二维（2D）COF，在用紫外光照射时，其电导率可从低状态（开放形式）到高状态（封闭形式）可逆地切换200次，并用可见光可逆切换。这种可逆现象可以通过包含发光二极管（LED）的电路进行监测。光致闭环/开环反应不会破坏框架的完整性，并且两个过程都随时间遵循对数载流子生成。此外，已经证明了COF电子性质与光诱导动力学和吸收曲线变化之间的相关性。
