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Phenyl Benzo[ b ]phenothiazine as a Visible Light Photoredox Catalyst for Metal‐Free Atom Transfer Radical Polymerization
Author(s) -
DadashiSilab Sajjad,
Pan Xiangcheng,
Matyjaszewski Krzysztof
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201605574
Subject(s) - atom transfer radical polymerization , photochemistry , phenothiazine , chemistry , photoredox catalysis , visible spectrum , polymerization , living free radical polymerization , chain transfer , radical polymerization , copolymer , polymer chemistry , polymer , photocatalysis , catalysis , materials science , organic chemistry , medicine , optoelectronics , pharmacology
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.