Visible Light and Sunlight Photoinduced ATRP with ppm of Cu Catalyst
Visible Light and Sunlight Photoinduced ATRP with ppm of Cu Catalyst
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DOI：
10.1021/mz300457e
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发表时间：
2012-10-01
影响因子：
7.015
通讯作者：
Matyjaszewski, Krzysztof
中科院分区：
文献类型：
--
作者：
Konkolewicz, Dominik;Schroeder, Kristin;Matyjaszewski, Krzysztof
光化学诱导的ATRP在百万分之几（ppm）铜催化剂的存在下用可见光和太阳光进行。在392和450 nm光的情况下，但在631 nm光的情况下，反应混合物的照射产生聚合。阳光也是光诱导ATRP的可行来源。对照实验表明光还原的铜-II复合物（配体的金属电荷转移在激发态），产生的铜-I复合物，和溴自由基，可以引发聚合。没有检测到Cu-I络合物的光活化。这意味着在光存在下ATRP的机制是ICAR和ARGET ATRP的混合。该方法也被用于合成嵌段共聚物和水中聚合。
Photochemically induced ATRP was performed with visible light and sunlight in the presence of parts per million (ppm) copper catalysts. Illumination of the reaction mixture yielded polymerization in case of 392 and 450 nm light but not for 631 nm light. Sunlight was also a viable source for the photoinduced ATRP. Control experiments suggest photoreduction of the Cu-II complex (ligand to metal charge transfer in the excited state), yielding a Cu-I complex, and a bromine radical that can initiate polymerization. No photo-activation of Cu-I complex was detected. This implies that the mechanism of ATRP in the presence of light is a hybrid of ICAR and ARGET ATRP. The method was also used to synthesize block copolymers and polymerizations in water.