Construction Of Fully Conjugated Covalent Organic Frameworks Via Facile Linkage Conversion For Efficient Photoenzymatic Catalysis
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY(2020)
摘要
Covalent organic frameworks (COFs) with improved stability and extended pi-conjugation structure are highly desirable. Here, two imine-linked COFs were converted into ultrastable and pi-conjugated fused-aromatic thieno[3,2-c]pyridine-linked COFs (B-COF-2 and T-COF-2). The successful conversion was confirmed by infrared and solid-state C-13 NMR spectroscopies. Furthermore, the structures of thieno[3,2-c]pyridine-linked COFs were evaluated by TEM and PXRD. It is noted that a slight difference in the structure leads to totally different photoactivity. The fully pi-conjugated T-COF-2 containing triazine as the core exhibited an excellent photocatalytic NADH regeneration yield of 74% in 10 min.
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关键词
conjugated covalent organic frameworks,organic frameworks,facile linkage conversion
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