Near-Infrared-Light-Induced Reaction of Singlet SO with Allene and Dimethylacetylene in a Rare Gas Matrix. Infrared Spectra of Two Novel Episulfoxides

Article abstract of DOI:10.1021/j100341a023

SO-allene and SO-dimethylacetylene pairs were prepared in solid Ar at 12 K in order to explore near-infrared-light-induced chemistry of SO(a¹Δ) (T₀₀ = 5860 cm^-1) and SO(b¹Σ⁺) (T⁰⁰ = 10470 cm^-1).Sulfur monoxide was generated by pyrolysis of ethylene episulfoxide in the matrix gas deposition line.Fundamental absorptions of SO(X³Σ^-) were measured at 1138.7 cm^-1 (Ar), 1134.8 cm^-1 (Kr), and 1129.5 cm^-1 (Xe).Selective excitation of SO(¹Δ) and SO(¹Σ⁺) vibronic levels with CW dye laser or filtered tungsten source light led to chemical reaction, the first ever observed of singlet SO.Product analysis by FT-infrared spectroscopy revealed two novel three-membered ring molecules, allene episulfoxide and dimethylacetylene episulfoxide.The SO ¹Σ⁺, 1 <- ³Σ^-, 0 vibronic transition was recorded by laser reaction excitation spectroscopy, and an absorption peak was found at 11420 cm^-1 (Ar).