One-pot cascade construction of nonsubstituted quinoline-bridged covalent organic frameworks
Huaji Pang1,2, Dekang Huang1, Yanqiu Zhu1,2
1Department of Chemistry, College of Science, Huazhong Agricultural University Wuhan Hubei 430070 China ygxiang@mail.hzau.edu.cn.
Abstract:
Irreversible locking of imine linkages into stable linkages represents a promising strategy to improve the robustness and functionality of covalent organic frameworks (COFs). We report, for the first time, a multi-component one-pot reaction (OPR) for imine annulation to construct highly stable nonsubstituted quinoline-bridged COFs (NQ-COFs), and that equilibrium regulation of reversible/irreversible cascade reactions by addition of MgSO4 desiccant is crucial to achieve high conversion efficiency and crystallinity. The higher long-range order and surface area of NQ-COFs synthesized by this OPR than those of the reported two-step post-synthetic modification (PSM) facilitate charge carrier transfer and photogeneration ability of superoxide radicals (O2˙-), which makes these NQ-COFs more efficient photocatalysts for O2˙- mediated synthesis of 2-benzimidazole derivatives. The general applicability of this synthetic strategy is demonstrated by fabricating 12 other crystalline NQ-COFs with a diversity of topologies and functional groups.
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