Redox-switchable atom transfer radical polymerization

被引：26

作者：

Dadashi-Silab, Sajjad ^{[1
]}

Lorandi, Francesca ^{[1
]}

Fantin, Marco ^{[1
]}

Matyjaszewski, Krzysztof ^{[1
]}

机构：

[1] Carnegie Mellon Univ, Dept Chem, 4400 Fifth Ave, Pittsburgh, PA 15213 USA

来源：

CHEMICAL COMMUNICATIONS | 2019年 / 55卷 / 05期

关键词：

CATALYST; LACTIDE; ATRP; PPM; ACETONITRILE; REDUCTION; OXIDATION; LIGAND; LIGHT; ACID;

D O I：

10.1039/c8cc09209e

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Temporal control in atom transfer radical polymerization (ATRP) relies on modulating the oxidation state of a copper catalyst, as polymer chains are activated by L/Cu-I and deactivated by L/Cu-II. (Re)generation of L/Cu-I activator has been achieved by applying a multitude of external stimuli. However, switching the Cu catalyst off by oxidizing to L/Cu-II through external chemical stimuli has not yet been investigated. A redox switchable ATRP was developed in which an oxidizing agent was used to oxidize L/Cu-I activator to L/Cu-II, thus halting the polymerization. A ferrocenium salt or oxygen were used to switch off the Cu catalyst, whereas ascorbic acid was used to switch the catalyst on by (re)generating L/Cu-I. The redox switches efficiently modulated the oxidation state of the catalyst without sacrificing control over polymerization.

引用

页码：612 / 615

页数：4

共 49 条

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