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A Covalent Organic Framework Film for Three‐State Near‐Infrared Electrochromism and a Molecular Logic Gate
Author(s) -
Hao Qing,
Li ZhiJuan,
Bai Bin,
Zhang Xing,
Zhong YuWu,
Wan LiJun,
Wang Dong
Publication year - 2021
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.202100870
Subject(s) - materials science , electrochromism , stacking , covalent organic framework , triphenylamine , optoelectronics , crystallinity , chemical engineering , porosity , electrode , organic chemistry , composite material , chemistry , engineering
A Kagome structure covalent organic framework (COF) film with three‐state NIR electrochromic properties was designed and synthesized. The COF TPDA‐PDA film is composed of hexagonal nanosheets with high crystallinity and has three reversible color states at different applied potentials. It has high absorption spectra changes in the NIR region, ascribed to the strong intervalence charge transfer (IVCT) interaction of the Class III mixed‐valence systems of the conjugated triphenylamine species. The film showed sub‐second response time (1.3 s for coloring and 0.7 s for bleaching at 1050 nm) and long retention time in the NIR region. COF TPDA‐PDA film shows superior NIR electrochromic properties in term of response time and stability, attributed to the highly ordered porous structure and the π–π stacking structure of the COF TPDA‐PDA architecture. The COF TPDA‐PDA film was applied in mimicking a flip‐flop logic gate with optical memory function.