Synthesis Of Lead Halide Perovskites And Their Application In Light-driven Organic Reactions

The development of green,sustainable and economical chemical processes is a research hotspot in the field of chemistry today,and the utilization of abundant and renewable sunlight for light-driven organic synthesis holds great promise.The development of facile,inexpensive,efficient,and stable photocatalysts remains a major challenge for light-driven organic synthesis.Among the numerous photoactive materials,perovskite-type photocatalysts are widely used in the field of photocatalytic organic reactions due to their unique properties,including strong and broad light absorption,long excited state lifetime,and high photoluminescence quantum yield.increasingly widespread.The photoelectric conversion efficiency of lead halide perovskite solar cells reaches 24.2%,making perovskite a unique solar energy harvesting material.Based on this,perovskites are used as photocatalysts in photocatalytic organic synthesis reactions.Perovskite photocatalysts can catalyze a wider range of organic substrates due to their easily tunable band gaps.In addition,they have the advantages of facile preparation,low cost,good catalytic effect,easy storage,and recyclability.Therefore,this subject prepared two lead halide perovskite photocatalysts,namely CsPbBr₃ and CH₃NH₃Pb I₃,and characterized them by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),etc.The catalytic performance of its catalytic reaction was investigated.First,CsPbBr₃ was prepared.The study found that the catalyst can realize the coupling reaction preparation of 1,3-dicarbonyl compound and tertiary amine under the irradiation of blue light at room temperature and pressure with air as the medium.The experimental results show that the catalytic system is mild,simple and efficient,the catalyst is easy to recover and has a wide range of applications.Secondly,the CsPbBr₃ synthesized above can also catalyze the reaction of o-phenylenediamine and benzaldehyde to synthesize a series of benzimidazole derivatives under illumination.The reaction can be carried out at room temperature,the reaction time is short,the catalytic efficiency is high,the catalyst is easy to recover,and good catalytic activity can still be maintained after being repeatedly used for five times.Finally,CH₃NH₃Pb I₃ was prepared.It was found that the catalyst could catalyze the synthesis of various?-ketoester derivatives from benzoylacetonitrile and alcohol under the conditions of room temperature and white light.Experiments show that the reaction does not need to add additional oxidant at room temperature,the reaction time is short,and the reaction conditions are mild.The catalyst exhibits excellent catalytic activity,high catalytic efficiency,and easy recovery and separation during the reaction process.