Journal
CHEMICAL COMMUNICATIONS
Volume 55, Issue 5, Pages 612-615Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cc09209e
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Funding
- NSF [CHE-1707490]
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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.
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