Pyridinium(Boron) Fluorophores as Versatile Photocatalysts

Photoexcited molecules enable novel chemical transformations by exhibiting unique redox and photosensitizing properties. While various molecular photocatalysts have been developed, the ones that can facilitate a wide array of reactions remain scarce, and many existing photocatalysts lack the structural flexibility required for fine-tuning their properties. In this study, we introduce the pyridinium(boron) motif as a versatile fluorophore, forming a highly tunable family of organic photocatalysts with extensive applicability. The model compound Ph(dppy)BOMe showcases exceptional photoredox activity and energy transfer capabilities, rivaling those of widely used established photocatalysts. By strategically tailoring the substituents to suit specific catalytic reactions, we demonstrate that these catalysts can be optimized for divergent reactions requiring distinct redox characteristics. The straightforward modular synthesis and flexible tunability of pyridinium(boron) fluorophores position them as promising candidates for advanced photocatalytic applications.