title: Phenyl Benzo[b]phenothiazine as a Visible Light Photoredox Catalyst for Metal-Free Atom Transfer Radical Polymerization.
abstract: This paper reports use of phenyl benzo[b]phenothiazine (Ph-benzoPTZ) as a visible light-induced metal-free atom transfer radical polymerization (ATRP) photoredox catalyst. Well-controlled polymerizations of various methacrylate monomers were conducted under a 392 nm visible light LED using Ph-benzoPTZ to activate different alkyl halides. The use of the photocatalyst enabled temporal control over the growth of polymer chains during intermittent on/off periods. The polymerization was initiated and progressed only under stimulation by light and completely stopped in the absence of light. Block copolymers were synthesized to demonstrate high retention of chain end fidelity in the polymers and livingness of the process.
authors.affiliation: Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, 15213, Pennsylvania, USA.
authors.forename: Sajjad
authors.identifier: http://orcid.org/0000-0002-4285-5846
authors.initials: S
authors.lastname: Dadashi-Silab
authors.affiliation: Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, 15213, Pennsylvania, USA.
authors.forename: Xiangcheng
authors.identifier: http://orcid.org/0000-0003-3344-4639
authors.initials: X
authors.lastname: Pan
authors.affiliation: Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, 15213, Pennsylvania, USA.
authors.forename: Krzysztof
authors.identifier: http://orcid.org/0000-0003-1960-3402
authors.initials: K
authors.lastname: Matyjaszewski
keywords: atom transfer radical polymerization; metal-free photoredox; phenothiazine; photoinduced polymerization; visible light photoredox catalysis