期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 17, 期 52, 页码 15027-15031出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201101445
关键词
iridium; photochemistry; photoredox catalysis; ring-opening polymerization; silyl radicals
资金
- Agence Nationale de la Recherche [ANR 2010-BLAN-0802]
- Institut Universitaire de France IUF
Iridium(III) complexes were designed and evaluated as efficient photoinitiators of polymerization reactions in combination with iodonium salts and silanes. Mechanistically, these reactions were shown to proceed through oxidative photoredox catalysis, generating aryl and silyl radicals under very soft irradiation conditions (blue LED, xenon lamp, and even sunlight). These radicals can initiate the free radical polymerization of acrylates or can be oxidized during the catalytic cycle to promote the ring-opening polymerization of epoxy monomers. Remarkably, both the (photo)chemical reactivity and the practical efficiency are dramatically affected by the ligands. In addition, the central role played by the oxidation ability of the excited state of the photocatalyst is discussed.
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