Shen Liangliang, Lu Qunzan, Zhu Anqi, Lv Xiaoqing, An Zesheng
Institute of Nanochemistry and Nanobiology, College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
ACS Macro Lett. 2017 Jun 20;6(6):625-631. doi: 10.1021/acsmacrolett.7b00343. Epub 2017 May 25.
A photocontrolled reversible addition-fragmentation chain transfer (RAFT) polymerization mediated by a supramolecular photoredox catalyst is reported. Cucurbit[7]uril (CB[7]) was used to form a host-guest complex with Zn(II) meso-tetra(4-naphthalylmethylpyridyl) porphyrin (ZnTPOR) to prevent aggregation of ZnTPOR, which in combination with a chain transfer agent (CTA) initiated efficient and controlled RAFT polymerization in water under visible light. RAFT polymerization was significantly affected by the subtle interplay of host-guest, electrostatic, and steric interactions among CB[7], ZnTPOR, and CTA. Polymerization rate was remarkably improved using CB[7]@ZnTPOR in comparison with that using ZnTPOR. The use of supramolecular interactions to modulate photocontrolled RAFT polymerization provides new opportunities to manipulate controlled radical polymerizations.
报道了一种由超分子光氧化还原催化剂介导的光控可逆加成-断裂链转移（RAFT）聚合反应。葫芦[7]脲（CB[7]）用于与中-四（4-萘甲基吡啶基）锌卟啉（ZnTPOR）形成主客体复合物，以防止ZnTPOR聚集，其与链转移剂（CTA）相结合，在可见光下于水中引发了高效且可控的RAFT聚合反应。RAFT聚合反应受到CB[7]、ZnTPOR和CTA之间主客体、静电和空间相互作用的微妙相互影响的显著影响。与使用ZnTPOR相比，使用CB[7]@ZnTPOR时聚合速率显著提高。利用超分子相互作用来调节光控RAFT聚合反应为控制自由基聚合反应提供了新的机会。
