Ligand Influence on the Performance of Cesium Lead Bromide Perovskite Quantum Dots in Photocatalytic C(sp3)–H Bromination Reactions

• DOI: 10.1021/jacs.4c17013
• Publication Date: 2025-02-28T17:01:50Z
• Authors: Willi M. Amberg; Henry Lindner; Yesim Sahin; Erich Staudinger; Viktoriia Morad; Sebastian Sabisch; Leon G. Feld; Yuxuan Li; Dmitry N. Dirin; Maksym V. Kovalenko; Erick M. Carreira
• Keywords: Caesium

Lead halide perovskite quantum dots (LHP QDs) CsPbX3 generate immense interest as narrow-band emitters for displays, lasers, and light sources. All QD applications rely on suited engineering of surface capping ligands. The first generation LHP QDs employed oleic acid/oleyl amine have found only a limited use in photoredox catalysis. These catalysts been reported to be unstable decompose over the course reaction, thus reducing turnover numbers (TONs) limiting their synthetic ability. Herein, impact eight distinct ligands monodisperse CsPbBr3 is reported, affording thorough comprehension performance photocatalytic C–H brominations. efforts yielded operating at extremely low catalyst loadings (<100 ppb) with TONs 9,000,000 per QD. We emphasize that optimal catalytic requires increased accessibility without compromising structural colloidal integrity. Control experiments indicated well-known such Ir(ppy)3, Ru(bpy)3Cl2, or 4CzlPN are ineffective same reaction. Mechanistic studies reveal C–Br bond reduction CH2Br2 rate-limiting step likely facilitated through interaction surface. This work outlines holistic approach toward design practically useful photocatalysts out comprising structurally soft cores dynamically bound