Guo Yanmei, Lou Yongbing, Chen Jinxi, Zhao Yixin
School of Chemistry and Chemical Engineering, Southeast University, 211189, Nanjing, P. R. China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 200240, Shanghai, P. R. China.
ChemSusChem. 2022 Feb 8;15(3):e202102334. doi: 10.1002/cssc.202102334. Epub 2021 Dec 30.
Lead halide perovskite nanocrystals (NCs) have been regarded as a promising potential photocatalyst, owing to their high molar extinction coefficient, low economic cost, adjustable light absorption range, and ample surface active sites. However, the toxicity of lead and its inherent instability in water and polar solvents could hinder their wide application in the field of photocatalysis. Herein, with α-alkylation of aldehydes as a model reaction, C-C bond-forming is demonstrated in high yield by using lead-free double perovskite Cs AgSbCl NCs under visible light irradiation. Moreover, the photocatalytic performance is simply improved by rational control of the surface ligands and a reaction mechanism involving a radical intermediate is proposed. Although the stability requires further amelioration, the results indicate the enormous potential of lead-free double perovskite NC photocatalysts for organic synthesis and chemical transformations.
卤化铅钙钛矿纳米晶体（NCs）因其高摩尔消光系数、低经济成本、可调节的光吸收范围和丰富的表面活性位点，被视为一种有潜力的光催化剂。然而，铅的毒性及其在水和极性溶剂中的固有不稳定性可能会阻碍它们在光催化领域的广泛应用。在此，以醛的α-烷基化反应为模型反应，证明了在可见光照射下，使用无铅双钙钛矿Cs AgSbCl NCs可以高产率地实现C-C键的形成。此外，通过合理控制表面配体可简单地提高光催化性能，并提出了一种涉及自由基中间体的反应机理。尽管稳定性仍需进一步改善，但结果表明无铅双钙钛矿NC光催化剂在有机合成和化学转化方面具有巨大潜力。
