Visible-Light Amine Thioxanthone Derivatives as Photoredox Catalysts for Photopolymerization Processes

Herein, mono- and disubstituted thioxanthones have been synthesized introduced as photosensitizers of iodonium salt for cationic free-radical photopolymerization epoxy an acrylate monomer, respectively. Photoinitiation activity these molecules was verified during processes performed upon exposure to visible LEDs 420, 455, 470 nm. The kinetics the followed using FT-IR spectroscopy. Moreover, developed compounds were proposed strongly reducing metal-free photoredox catalysts in organocatalyzed atom transfer radical polymerization (ATRP). Thioxanthone derivatives (with alkyl halide) efficiently activate ATRP methyl methacrylate a LED irradiation source. formed polymers process characterized by SEC. Apart from studying with participation obtained thioxanthones, absorption, fluorescence, well electrochemical properties thioxanthone investigated. Furthermore, performance studied 3D printing applications also examined. most important result this study is design possible application photosensitizers/photocatalysts processes.