Utilizing the electron transfer mechanism of chlorophyll a under light for controlled radical polymerization.
Utilizing the electron transfer mechanism of chlorophyll a under light for controlled radical polymerization.
复制标题
DOI：
10.1039/c4sc03342f
复制
发表时间：
2015-02-01
期刊：
影响因子：
8.4
通讯作者：
Boyer C
中科院分区：
文献类型：
--
作者：
Shanmugam S;Xu J;Boyer C
我们报道了一种高效的光诱导活性自由基聚合过程，该过程涉及到使用叶绿素作为光氧化还原催化剂，这使得可以制备定义良好的聚合物。近年来，在可见光下引发有机反应和聚合反应的高效光氧化还原催化剂应运而生。然而，这些催化剂是由稀有金属组成的，这限制了它们的应用。在这项研究中，我们报告了一种高效的光诱导活性自由基聚合过程，该过程涉及到使用叶绿素作为光氧化还原生物催化剂。我们证明了在蓝光和红光(λmax分别为461和635 nm)下，植物中最丰富的叶绿素a可以激活光致电子转移过程，从而引发可逆的加成-断裂链转移聚合。这一过程控制了广泛的功能和非功能单体，并提供了对分子量和多分散性的出色控制。通过核磁共振、UV-Vis光谱和成功的两嵌段共聚物的扩链反应证明了端基的保真度。
We report an efficient photoinduced living radical polymerization process that involves the use of chlorophyll as the photoredox catalyst, which allows the preparation of well-defined polymers. Efficient photoredox catalysts containing transition metals, such as iridium and ruthenium, to initiate organic reactions and polymerization under visible light have recently emerged. However, these catalysts are composed of rare metals, which limit their applications. In this study, we report an efficient photoinduced living radical polymerization process that involves the use of chlorophyll as the photoredox biocatalyst. We demonstrate that chlorophyll a (the most abundant chlorophyll in plants) can activate a photoinduced electron transfer (PET) process that initiates a reversible addition-fragmentation chain transfer (RAFT) polymerization under blue and red LED light (λmax = 461 and 635 nm, respectively). This process controls a wide range of functional and non-functional monomers, and offers excellent control over molecular weights and polydispersities. The end group fidelity was demonstrated by NMR, UV-vis spectroscopy, and successful chain extensions for the preparation of diblock copolymers.
登录
查看更多内容
影响因子：
3
作者：
Johnston, Aubrey;Scaggs, Jon;McDougal, Owen M.
通讯作者：
McDougal, Owen M.
影响因子：
5.5
作者：
Anastasaki, Athina;Nikolaou, Vasiliki;Haddleton, David M.
通讯作者：
Haddleton, David M.
影响因子：
15
作者：
Anastasaki, Athina;Nikolaou, Vasiliki;Haddleton, David M.
通讯作者：
Haddleton, David M.
影响因子：
16.6
作者：
Fors, Brett P.;Hawker, Craig J.
通讯作者：
Hawker, Craig J.
影响因子：
--
作者：
AGRAWAL, ML;CHAUVET, JP;PATTERSON, LK
通讯作者：
PATTERSON, LK