Chemistry Seminar: Characterizing Charge-Transfer Properties of Photoredox Catalysts by Electroabsorption Spectroscopy
Chemistry and Materials Science Seminar
Characterizing Charge-Transfer Properties of Photoredox Catalysts by Electroabsorption Spectroscopy
Dr. Peter Dinolfo
Associate Professor/Associate Department Head, Chemistry and Chemical Biology
Rensselaer Polytechnic Institute
Abstract:
Organic based photoredox catalysts have been explored as inexpensive, earth-abundant, and non-toxic alternatives to traditional Ir and Ru based photocatalysts. In addition to their favorable excited-state redox potentials, the donor-acceptor nature of these systems is thought to be important to their photocatalytic efficiency. Herein, we utilize electroabsorption (Stark) spectroscopy to determine the magnitude of intramolecular charge-transfer for a series of 9-mesityl-acridinium and carbazolyl functionalized cyanoarene photoredox catalysts. Electroabsorption spectroscopy measures the change in absorption of a chromophore with the application of large electric fields. Analysis of the spectra provides a direct measure of the change in dipole moment and polarizability associated with electronic transitions. This information is important when designing new molecular chromophores for use in photoredox catalysis, as well as solar energy conversion, artificial photosynthesis, among others
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