Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 3, Pages 1036-1040Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201510037
Keywords
bacteriochlorophyll; controlled radical polymerization; photocatalysis; photoinduced electron transfer; RAFT polymerization
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Funding
- University of New South Wales
- Australian Research Council (ARC-FT)
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Photoregulated polymerizations are typically conducted using high-energy (UV and blue) light, which may lead to undesired side reactions. Furthermore, as the penetration of visible light is rather limited, the range of applications with such wavelengths is likewise limited. We herein report the first living radical polymerization that can be activated and deactivated by irradiation with near-infrared (NIR) and far-red light. Bacteriochlorophylla (Bachla) was employed as a photoredox catalyst for photoinduced electron transfer/reversible addition-fragmentation chain transfer (PET-RAFT) polymerization. Well-defined polymers were thus synthesized within a few hours under NIR (=850nm) and far-red (=780nm) irradiation with excellent control over the molecular weight (M-n/M-w<1.25). Taking advantage of the good penetration of NIR light, we showed that the polymerization also proceeded smoothly when a translucent barrier was placed between light source and reaction vessel.
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