Thursday, March 16, 2023 - 3:30pm

Abstract: Photoredox catalysis has continued to gain attention for its ability to perform previously unachieved reactivity in the fields of renewable fuels and organic synthesis. In general, photoredox systems offer a potentially sustainable route to drive single-electron transfers to activate a secondary catalyst for small molecule activations and bond forming reactions. Our group have developed a photoredox system with secondary nickel catalysts capable of C-C, C-N, and N-N bonds. We were the first to report the translation of cross-electrophile coupling to a photoredox system for C-C bond formations involving aryl and alkyl moieties. Mechanistic investigations elucidated the roles and reactivities of each component in the catalytic system. This mechanism can be generally applied to C-N and N-N bond forming catalysis. Recently we have developed a new photoredox catalysis system that utilizes naphthol as a photoredox catalysts. This system represents a new paradigm for the use of aryl alcohol photocatalysts for high energy reactions. We have shown that in conjunction with an additional photosensitizer, naphthol photocatalysts can drive reactions that are uphill by 511 kJ/mol. In addition, we have shown that the renewable fuel H2 can be photocatalytically produced from a system containing only naphthol and ferrocene.


Aaron Vannucci


University of South Carolina


RH 104