Triplet-State Chemiluminescence: Acetone T1 from the Decomposition of Chemically Activated 3,3-Dimethyl-4-(N,N-dimethylamino)-1,2-dioxetane

Article abstract of DOI:10.1021/j100157a006

The reaction of O2(a,¹Δ_g) with N,N-dimethylisobutenylamine has been studied in the gas phase at 298 K, a total pressure of 4 Torr, and an oxygen partial pressure of 0.007-4.0 Torr.The reaction forms a chemically activated dioxetane that decomposes with chemiluminescence (CL).CL spectra were obtained, and deconvolution showed them to consist of acetone T₁ -> S₀ and S₁ -> S₀ and no other molecular emissions.The T₁ state was efficiently quenched by O2.The integrated intensity ratio, I(T₁)/I(S₁), was 1.3 at P(O2) = 0.The T₁ -> S₀ spectrum shows its onset at 366 nm and peak intensity at 440 nm.