Visualizing Back Electron Transfer in Eosin Y Photoredox Catalysis

Abstract

Back electron transfer (BET) in eosin Y (EY) photoredox catalysis was visualized via the fluorescence of single EYs. Commonly used quenchers, alkyl bromides and tertiary amine, were studied. BET was observed in alkyl bromides, but not in tertiary amine. The finding helped explain the mechanism of EY-catalyzed polymerization.