Triarylamines as catalytic donors in light-mediated electron donor-acceptor complexes

Area of Science:

• Organic Chemistry
• Photocatalysis
• Catalysis

Background:

• Electron Donor-Acceptor (EDA) complex photochemistry is a developing field in catalysis.
• Catalytic systems enabling electron transfer (ET) decoupling from bond formation are of significant interest.
• Practical EDA systems and their mechanisms remain underexplored.

Purpose of the Study:

• To discover and characterize a novel EDA complex for catalytic C-H perfluoroalkylation.
• To investigate the reaction mechanism under visible light irradiation.
• To establish a pH- and redox-neutral catalytic system.

Main Methods:

• Formation and characterization of an EDA complex between triarylamines and α-perfluorosulfonylpropiophenone.
• Visible light irradiation for C-H perfluoroalkylation of arenes and heteroarenes.
• Detailed photophysical characterization of the EDA complex and intermediates.

Main Results:

• Discovery of a novel EDA complex catalyzing C-H perfluoroalkylation.
• Successful perfluoroalkylation of various arenes and heteroarenes under visible light.
• Elucidation of the reaction mechanism involving radical cation intermediates.

Conclusions:

• The developed EDA complex provides a new catalytic method for C-H perfluoroalkylation.
• The reaction proceeds under mild, pH- and redox-neutral conditions.
• Understanding the mechanism facilitates the design of future photocatalytic systems.