Observation of Light-Induced Reactions of Olefin–Ozone Complexes in Cryogenic Matrices Using Fourier-Transform Infrared Spectroscopy

Each olefin (ethylene, trans-1,3-butadiene, isoprene, dimethyl butadiene (DMB)) and ozone molecules were codeposited on a CsI window at cryogenic temperature, the products of photolysis with ultraviolet–visible light observed using Fourier-transform infrared spectroscopy. The C2H4–O3 system could be assigned to glyoxal (CHO–CHO), ethylene oxide (c–C2H4O), CO, CO2. formation CHO–CHO c–C2H4 absence H2CO HCOOH indicated that main reaction channels did not involve C–C bond breaking. Based this simple scheme, photoproducts different olefin–O3 systems assigned, vibrational features predicted by density functional theory calculations compared spectra. Regarding butadiene, spectral matches between observations seemed reasonable, while assignments for isoprene ambiguities DMB remain, mainly because limited availability authentic sample