title: A Photoresponsive Surface Covalent Organic Framework: Surface-Confined Synthesis, Isomerization, and Controlled Guest Capture and Release.
abstract: 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.
authors.affiliation: State Key Laboratory of Robotics and System (HIT), Harbin Institute of Technology, Harbin, 150080, P. R. of China.
authors.forename: Chunhua
authors.initials: C
authors.lastname: Liu
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing, 100190, P. R. of China.
authors.forename: Qingdao
authors.initials: Q
authors.lastname: Zeng
authors.affiliation: State Key Laboratory of Robotics and System (HIT), Harbin Institute of Technology, Harbin, 150080, P. R. of China. leisb@hit.edu.cn.|Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science & Collaborative Innovation, Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072, P. R. of China. leisb@hit.edu.cn.
authors.forename: Shengbin
authors.identifier: 0000-0002-2483-5286
authors.initials: S
authors.lastname: Lei
keywords: STM; boronic acid; condensation; covalent organic frameworks (COFs); photoisomerization