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A Photoresponsive Surface Covalent Organic Framework: Surface‐Confined Synthesis, Isomerization, and Controlled Guest Capture and Release
Author(s) -
Liu Chunhua,
Zhang Wei,
Zeng Qingdao,
Lei Shengbin
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201601199
Subject(s) - azobenzene , isomerization , covalent bond , nanoporous , materials science , photochemistry , phthalocyanine , annealing (glass) , covalent organic framework , chemical engineering , chemistry , nanotechnology , organic chemistry , polymer , catalysis , composite material , engineering
By introducing an azobenzene group to the backbone of diboronic acid, we have obtained a surface‐confined, photoresponsive single‐layer covalent organic framework with long‐range order and almost entire surface coverage. Scanning tunneling microscopic characterization indicates that though the covalent linkage provides a significant locking effect, isomerization can still happen under UV irradiation, which causes destruction of the surface COF. Furthermore, the decomposed surface COF can recover upon annealing. This photoinduced decomposition provides a facile approach for the controlled capture and release of targeted objects using these nanoporous surface COFs as a host, which has been demonstrated in this work using copper phthalocyanine as a model guest.