摘要
The sp2 carbon-conjugated covalent organic frameworks(COFs)with fully π-conjugated lattice and high chemical stability are promising heterogeneous photocatalysts.Herein,we report the design and synthesis of a novel palladium(Pd)porphyrin-based sp2 carbon-conjugated COF(PdPor-sp2c-COF)with an eclipsed AA stacking 2D structure.Interestingly,PdPor-sp2c-COF showed high crystallinity,good chemical stability,and a broad absorp-tion of visible light.Moreover,compared to our previously reported metal-free Por-sp2c-COF,PdPor-sp2c-COF displays an improved photocatalytic performance in the selective aerobic oxidation of sulfides under green light irradiation.The systematic mechanistic studies testified that the enhanced photocatalytic activity can be ascribed to promoting energy transfer pathway over PdPor-sp2c-COF.Our study clearly demonstrates that it is favorable to promote the energy transfer pathway in sp2 carbon-conjugated COFs by using metalloporphyrin-based molecular building blocks.This work will inspire us to design and synthesize novel photocatalysts based on COFs for the selective aerobic oxidation.
基金
supported by the National Natural Science Foundation of China(22225503,U21A20285,and 22375153)
the Hubei Provincial Natural Science Foundation of China(2023AFA011)
the Funda-mental Research Funds for Central Universities(2042023kf0127).
