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SUMMARY:Core Substitution of Diaryl Dihydrophenazine Photoredox Catalysts f
 or Organocatalyzed Atom Transfer Radical Polymerization
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20240503T160000
UID:2026-05-18-17-03-16@natsci.colostate.edu
DTSTAMP:20260518T170316
Description:About the Seminar:\n\nOrganocatalyzed atom transfer radical pol
 ymerization (O-ATRP) is a controlled radical polymerization method that us
 es organic photoredox catalysts (PCs) and visible light to produce polymer
 s with well-defined structures. Diaryl dihydrophenazine PCs have mediated 
 controlled polymerizations as indicated by low dispersity (Ð &lt\; 1.3)\,
  but in previous work low initiator efficiency (I* &lt\; 100%) has indicat
 ed lack of ability to achieve targeted molecular weights. The observed low
  I* has been attributed to a side reaction between the PC core and alkyl r
 adicals during polymerization. In this work\, core substitution of the cat
 alyst is used as a route to minimize side reactivity and to tune PC struct
 ure\, properties\, and performance in O-ATRP. Exploration of alkyl\, aryl\
 , and heteroatom core substitution reveals new structure-property relation
 ships that are leveraged to improve polymerization outcomes and address cu
 rrent limitations of O-ATRP. 4:00 pm
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