New progress in the field of photocatalysis of covalent organic framework materials

Recently, the team of Professor Lan Yaqian of the School of Chemistry of South China Normal University has made new progress in the field of photocatalysis of covalent organic framework materials with the support of the “Boxin Program” talent project and the National Natural Science Foundation of China. The research paper was published in Angewandte Chemie International Edition.


Biphotosensitive group covalent organic framework materials are used for photocatalytic reactions. Photo courtesy of the research team

The use of photocatalytic processes such as photolysis of water, CO2 reduction, photocatalytic organic conversion, etc. to convert solar energy into chemical energy, thereby generating high value-added chemicals, is considered to be a green and potential strategy to solve the energy crisis and environmental pollution problems. In the field of photocatalysis, metal complexes such as pyridineruthenium, pyriridine iridium, metalloporphyrins, etc. have been widely used as photosensitizers. However, most molecular photosensitizers only have a specific and narrow light absorption range, which limits the overall photocatalytic efficiency. Compounding the second photosensitive group with such molecular photosensitizers to form a two-component composite photosensitive catalyst will effectively enhance its light absorption capacity, thereby enhancing the overall photocatalytic efficiency.

Lan Yaqian’s team designed and synthesized a class of dual-photosensitizer-coupled metal-three-dimensional covalent organic frameworks (MCOFs) materials for efficient photocatalytic reactions. The research team creatively linked traditional molecular photosensitizer metal pyridine complexes[such as Ru(bpy)32+, Fe(bpy)32+]with porphyrins or metalloporphyrin molecules to form crystalline three-dimensional COFs, showing excellent photosensitivity and catalytic performance. The photohydrolytic activity of this class of catalysts is one of the highest performance of COF-based photocatalysts reported. In addition, the hydrogen produced in situ was successfully used in further organic hydrogenation reactions, achieving a hydrogenation conversion efficiency of >99% with alkyne-based compounds as substrates.

This work pioneered the exploration of the covalent ligation of multiple photosensitizer monomers to construct photoactive COFs, showing the great potential of multi-component photosensitive heterogeneous materials in the field of photocatalysis, and also providing new ideas for the design and development of efficient photocatalysts. (Source: China Science News Zhu Hanbin)

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