Pure-phase CsPbBr3 nanowires with higher charge transfer achieved by BODIPY as co-ligands and their efficient photocatalysis

BODIPY-derived primary amine salts (BDPBr-nC) are innovatively adopted as co-ligands to one-pot fabricate high-purity CsPbBr 3 perovskite nanowires. • Bromine-rich BDPBr-nC interacts electrostatically with surface uncoordinated Pb 2+ to regulate nanowire growth, purify crystal phase, and passivate surface defects; short-chain BDPBr-3C further reduces steric hindrance and boosts charge transfer efficiency. • The optimized CsPbBr 3 -BDPBr-3C achieves efficient photocatalytic radical-tandem cyclization benefiting from matched energy level alignment, providing a viable surface ligand engineering strategy for high-efficiency perovskite photocatalysts. Lead halide perovskite nanowires (NWs) demonstrate considerable potential in photocatalysis due to their strong visible light absorption, tunable bandgap, and high photoconductivity. However, traditional ligands often desorb from the perovskite NW surface, generating the impure phase and abundant surface defects that severely hinder the separation and utilization of photogenerated carriers, thereby limiting catalytic efficiency. Herein, a series of BODIPY-based primary amine salts with varying carbon chain lengths (denoted as BDPBr-nC (n = 3, 4, 5, 6)) as co-ligands were employed to one-pot synthesize pure phase CsPbBr 3 NWs (CsPbBr 3 -BDPBr-nC). The enriched Br environment in BDPBr-nC enables electrostatic interaction with uncoordinated Pb 2+ on the CsPbBr 3 surface, effectively promoting the NWs growth and driving a phase transition from mixed phase to pure phase. This structural improvement facilitates efficient separation of photo-generated carriers in CsPbBr 3 NWs. Moreover, the shorter carbon chain in BDPBr-3C provides more favorable steric effects and enhanced conductivity, leading to superior defect passivation and charge transfer capabilities. Therefore, with CsPbBr 3 -BDPBr-nC as a representative catalyst, we achieved efficient photocatalytic radical-tandem cyclization of N-phenylmaleimide and N-phenylglycine in 1, 2-dichloroethane. Favorable energy level alignment among BDPBr-nC, CsPbBr 3 NWs, and the reactants promotes efficient electron transfer, resulting in excellent photocatalytic efficiency. This work highlights the promising potential of surface ligand engineering in enhancing both the stability and photocatalytic performance of perovskite nanowires. Download: Download high-res image (295KB) Download: Download full-size image