Synthesis And Photocatalytic Performance Of 1,2,3-Triazole Based Conjugated Organic Porous Polymers

With the development of science and technology,photocatalytic organic conversion has received widespread attention.The catalysts used include transition metal complexes,organic dyes,small organic molecules,and graphite-phase carbon nitride.These catalysts are usually disturbed by several inherent problems,such as catalyst and product separation,participation of expensive and toxic precious metals,poor stability,and difficult to change chemical structure and optoelectronic properties,which severely limit their practical applications.Therefore,in order to effectively use visible light,it is still necessary to develop photocatalysts that are heterogeneous,non-metallic,stable,and with adjustable photovoltaic properties.Recently,conjugated organic porous polymers(CPPs)with alternating electron donor(D)and electron acceptor(A)units have been widely used as photocatalysts in various organic reactions.The advantage is the large ?-conjugated Diversity of systems,synthetic strategies,richness of monomers and easy adjustment of forbidden band width.In this paper,we report for the first time the design and synthesis of a series of1,2,3-triazole-based D-A CPPs and study their photocatalytic performance.We first used a click reaction to synthesize three monomer compounds with 1,2,3-triazolium units,and then these monomer compounds were oxidatively coupled under the action of anhydrous ferric chloride to obtain a series of 1-based DA CPPs of 2,3-triazole.Theoretical calculations show that these CPPs have donor-acceptor properties,and1,2,3-triazole is well used as an electron acceptor.D-A CPPs with thiophene,carbazole and diphenylamine as donors have different porosity and photoelectric properties.These D-A CPPs show effective photocatalytic performance for amine oxidative coupling and hydroxylation of arylboronic acid.It is worth noting that thiophene-containing conjugated organic porous polymer(PTPT)is a more effective photocatalyst for both reactions,which can be attributed to its smaller band gap width,higher charge transfer efficiency,and Low charge recombination rate.In addition,PTPT showed excellent recyclability,and its catalytic activity was not significantly lost after repeated recycling.