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首页> 外文期刊>Chemistry: A European journal >Subtle ligand effects in oxidative photocatalysis with iridium complexes: Application to photopolymerization
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Subtle ligand effects in oxidative photocatalysis with iridium complexes: Application to photopolymerization

机译：铱配合物在光催化氧化中的精细配体效应：在光聚合中的应用

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摘要

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.
机译：设计并评估了铱（III）配合物与碘鎓盐和硅烷一起作为聚合反应的有效光引发剂。从机理上讲，这些反应通过氧化光氧化还原催化进行，在非常柔和的辐照条件下（蓝色LED，氙气灯，甚至是阳光）产生芳基和甲硅烷基。这些自由基可以引发丙烯酸酯的自由基聚合，或者可以在催化循环中被​​氧化以促进环氧单体的开环聚合。显着地，（光）化学反应性和实际效率都受到配体的显着影响。另外，讨论了光催化剂的激发态的氧化能力所起的核心作用。

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