Synthesis Of Click-Based Conjugated Microporous Polymers And Its Application In Photocatalysis

In recent years,light induced organic conversion using visible light as energy source has been widely developed and applied in organic synthesis.Ti O₂,transition metal complexes,and organic dyes have been widely developed and used in visible light induced photocatalytic conversion.However,homogeneous catalytic materials still have shortcomings,including metal residues,high cost,poor stability,and non recyclability.Therefore,developing heterogeneous photocatalysts with visible light absorption capabilities is currently a very important research area,as it provides an opportunity to combine mild reaction conditions,easy product separation,metal free pollution,and photocatalyst recovery.CMPs are a class of organic microporous materials that can form a permanent porous structure through the formation of extendedπconjugated electron systems.At the same time,it has high surface area,rigid structure,adjustable band gap,good physical,chemical,and thermal stability characteristics,and is easy to functional transformation,making it have unique photoelectric performance,making it widely developed in heterogeneous photocatalytic conversion.Sonogashira reaction,Suzuki reaction,oxidative coupling reaction,etc.are common methods for constructing photocatalytic CMPs photocatalysts,while Cu（II）catalyzed click reaction has not yet been fully applied to the structural synthesis of CMPs.Click reaction has the advantages of high reaction efficiency,mild reaction conditions,wide group tolerance,and easy separation and purification of products.We have prepared three1,2,3-triazolyl CMPs（Ta-Ths）using click reaction.The structural characterization and photoelectric performance of Ta-Ths were tested.The results show that Ta-Th-7 has better optical absorption ability,smaller optical band gap,better charge transfer efficiency,and lower charge recombination rate.The polymer has good light absorption and photocatalytic properties under visible light conditions.In the visible light driven N-H insertion reaction and isocyanamide reaction between amines and isocyanides,the results showed that Ta-Th-7 had the best photocatalytic activity compared to Ta-Th-8 and Ta-Th-9.After 5 times of repeated catalytic reactions,Ta-Th-7 still maintains good photocatalytic activity,indicating that Ta-Ths has good reusability and high thermal stability.