Coreactant Strategy for the Photoredox Catalytic Generation of Trifluoromethyl Radicals under Low-Energy Photoirradiation
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2016
- URI http://www.dcollection.net/handler/ewha/000000140444
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/acs.joc.6b00966
초록/요약
Photoredox catalysis has emerged as a valuable alternative to dark-state catalysis. For the full potential of photoredox catalysis to be utilized, it is imperative to make use of low-energy photons in photoinduced radical processes. We have demonstrated that the use of oxalate as a coreactant provides a useful principle for the photocatalytic production of trifluoromethyl radicals (center dot CF3) from CF3I upon green or red LED photoirradiation of narrow-bandgap photocatalysts. The photo catalytic cycle involves a radical anion of carbon dioxide (CO2 center dot-) as a reductant for CF3I, which is generated through photoinduced oxidative decarboxylation of oxalate. Electrochemical characterizations and steady-state and transient photophysical investigations were performed to reveal that there are two photoinduced electron-transfer pathways for oxalate-mediated center dot CF3 generation.
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