CsPbX 3 Nanocrystal Incorporating Transition Metal Cocatalyst for Photocatalytic Organic Transformation by Single Electron Transfer

The construction of composite photocatalysts is a promising strategy for improving the overall catalytic efficiency in organic photochemical transformation. In this study, we synthesize a series of inorganic metal perovskite CsPbX 3 (X = Cl, Br, I) nanocrystals (NCs) with excellent chemical stability and wide‐range visible‐light absorption. The Pd cocatalyst is then induced to the surfaces of CsPbX 3 fabricating Pd/CsPbX 3 composites via visible‐light reduction method. Photoelectrochemical measurements show the introduction of Pd cocatalyst promotes efficiently the charge separation and transfer of CsPbX 3 . The prepared Pd/CsPbX 3 composites exhibit remarkable photocatalytic efficiency in visible‐light‐induced C–C cross‐coupling reaction. The reaction is characterized by mild reaction conditions, good recyclability, and high yield from a broad variety of substrates. Mechanism investigations show the reaction relies on the synergy of CsPbX 3 photocatalysis and Pd catalysis. The valence band of CsPbX 3 oxidizes the phenylboronic acid into active radical species via single electron transfer. On another hand, Pd(0) as active sites occurs oxidative addition with aryl halides for achieving the C–C cross‐coupling reaction. This study displays a feasible approach for the introduction of Pd catalyst in CsPbX 3 to achieve the photocatalytic organic transformation via photoinduced electron transfer.