Synthesis of Two-Dimensional C–C Bonded Truxene-Based Covalent Organic Frameworks by Irreversible Brønsted Acid-Catalyzed Aldol Cyclotrimerization
Open Access
- 1 January 2021
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Research
Abstract
The synthesis of new CC bonded two-dimensional (2D) covalent organic frameworks (COFs) is highly desirable. Here, a simple but effective synthetic strategy has been developed using an irreversible Brnsted acid-catalyzed aldol cyclotrimerization reaction by virtue of truxene as a linkage. Nonolefin CC bonded 2D truxene-based covalent organic frameworks (Tru-COFs) were constructed by polymerization of 1,3,5-triindanonebenzene (TDB). The structure formation was confirmed by wide-angle X-ray scattering, Fourier-transform infrared spectroscopy, and solid-state 13C CP/MAS NMR. The results showed that the Tru-COFs were porous (645m2/g) and chemically stable. Benzyl methylene in conjugated Tru-COFs more effectively produced photoinduced radicals than the model truxene compound. Due to the radical photoresponsiveness, Tru-COFs were efficient catalysts for photocatalytic oxidation of sulfides. We expect that this will provide a new synthetic methodology to obtain CC bonded functional 2D COFs.Keywords
Funding Information
- CAS Key Research Program of Frontier Sciences (QYZDY-SSW-SLH029)
- National Basic Research Program of China the Strategic Priority (2018YFA0703200, 2016YFA0200101)
- National Natural Science Foundation of China (21922511, 61890940, 21633012)
- Chinese Academy of Sciences (XDB30000000)
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