[2+2] Cycloaddition Sensitized by CsPbX ₃ Nanocrystals: Cooperative Effects of Driving Force and Exciton Confinement

NCs, (II) varying driving force at a fixed size via Br-to-Cl substitution, and (III) modulating confinement with Br/I mixed NCs in the low-bandgap regime. Our results show that stronger exciton confinement steeply increases the energy transfer rate, which is amplified by a more favorable driving force. Tuning the driving force alone for non-confined NCs provides only incremental increases in the reaction rate. These findings highlight a cooperative design strategy-maximizing coupling via exciton confinement and fine-tuning the driving force (ΔG°)-thereby leveraging structure-energetics synergy to advance NC-sensitized energy-transfer chemistry.