Matthew Ryan
Speaker's Institution
Colorado State University
4:00 pm
Chemistry A101
Mixer Time
3:45 pm
Mixer Time
Chemistry B101E
Calendar (ICS) Event
Additional Information

Organocatalyzed atom transfer radical polymerization (O-ATRP) has become a powerful methodology for the synthesis of well-defined polymers in a highly efficient manner. This process is made possible due to the advent of highly reducing organic photoredox catalysts (PCs) which are driven by visible light. The family of N,N-diaryl dihydrophenazine PCs have been shown to polymerize methacrylate monomers to polymers of dispersity commonly lower than 1.10, with quantitative initiator efficiency. Quantum chemical calculations have been used to realize N,N-diaryl dihydrophenazines that access a photoinduced intramolecular charge transfer excited state, reminiscent of the metal-to-ligand charge transfer observed in iridium and ruthenium polypyridal PCs. The combination of theoretical and experimental investigations reveal the importance of this charge transfer characteristic for O-ATRP, which is used as a design principle to further develop new catalyst families inspired by the N,N-diaryl dihydrophenazines.

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