Control of a Living Radical Polymerization of Methacrylates by Light

On–off: A living radical polymerization procedure, which utilizes ppm levels of an iridium-based photoredox catalyst, affords control over chain growth through mediation by visible light (see scheme; Pn=polymer chain, X=halogen, M=monomer). This process can be activated and deactivated by light, enables control over the molecular weight and molecular weight distributions, and tolerates different functional groups. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.