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SUMMARY:Development of Strongly Reducing Phenoxazine Organic Photoredox Cat
 alysts and their Application in Organocatalyzed Atom Transfer Radical Poly
 merization
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20193001T000000
UID:2026-04-24-01-18-44@natsci.colostate.edu
DTSTAMP:20260424T011844
Description:Research Seminar Abstract\n\nAtom transfer radical polymerizati
 on (ATRP)\, one of the most commonly used controlled radical polymerizatio
 n techniques\, enables facile synthesis of precision polymers using commer
 cially available starting materials. More recently\, the application of ex
 ternal stimuli to control ATRP has been investigated. For example\, photor
 edox catalyzed variants of ATRP have been explored using Ru- and Ir- conta
 ining photocatalysts\, enabling the synthesis of well-defined polymers und
 er mild conditions using visible light to drive the reaction. While the de
 velopment of photoredox catalyzed ATRP was a major advance\, researchers s
 ought to replace the transition metal-containing photocatalysts used for t
 hese reactions with organic photocatalysts to avoid issues with metal cont
 amination of the polymer product and to provide more sustainable catalyst 
 alternatives. This motivation led to the development of organocatalyzed AT
 RP (O-ATRP).\n\nSimilar to traditional ATRP\, the O-ATRP catalyst is respo
 nsible for controlling the polymerization through mediation of an activati
 on-deactivation process. However\, few organic photocatalysts which can ac
 cess excited states with sufficient reduction potentials to “activate”
  the alkyl halide chain end of dormant polymer chains are well-studied. As
  such\, a major challenge for the design of O-ATRP systems has been the id
 entification and understanding of new organic photocatalyst families that 
 can access strongly reducing excited states. To this end\, the work disclo
 sed herein is on the development of N-aryl phenoxazines as strongly reduci
 ng photocatalysts for O-ATRP. Through the synthesis and characterization o
 f phenoxazine derivatives bearing different N-aryl and/or core substituent
 s\, structure property relationships for altering the photophysical and re
 dox properties of this class of molecules has been established. Moreover\,
  the application of these photocatalysts for the O-ATRP of methyl methacry
 late was used to determine the effects of photocatalyst properties on cata
 lytic performance. 4:00 pm
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