Photochemical generation of acrylate radicals by sensitizing with acetone-propan-2-ol. A laser photolysis Fourier transform electron paramagnetic resonance study

The sensitized generation of acrylate radicals was studied in acrylate-acet one-propan-2-ol solution by using laser photolysis with time-resolved Fouri er transform electron paramagnetic resonance (EPR). In addition to the acet one ketyl radical, vinyl-type radicals of various acrylates were observed i n the nanosecond and microsecond time scales. Classification as vinyl-type radical structures was underpinned by quantum-chemical calculations. The ac rylate radicals were E/A spin-polarized by the CIDEP radical pair mechanism as described. A triplet exciplex is proposed as the precursor state of the acetone-acrylate radical pair. This interpretation is supported by quantum -chemical calculations.