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- W2019061946 abstract "Abstract The steady state photolysis of thioxanthen-9-one-10,10-dioxide ( 1 ) in dichloromethane does not result in any product formation. In hydrogen donor solvents, such as 2-propanol, toluene or cyclohexane, the formation of the corresponding pinacol was readily observed. The phosphorescence spectrum of 1 in EPA, at 77 K, reveals a triplet energy of 66.3 kcal mol −1 . Laser flash photolysis irradiation of a degassed acetonitrile solution of 1 led to the formation of its triplet excited state ( λ max = 375 and 520 nm, τ = 11 μs) that was quenched by oxygen, β-carotene and 1,3-cycloexadiene at a diffusion controlled rate constant. The quenching rate constants for the triplet of 1 with 1,4-cyclohexadiene, methanol, ethanol, 2-propanol, cyclohexane, substituted phenols and amines were determined, ranging from 7.1 × 10 6 (for methanol) to 3.1 × 10 10 L mol −1 s −1 (for triethylamine). From the quenching rate constants observed for the triplet excited state and from the steady state photolysis, it was concluded that the remarkable reactivity of 1 is due to the n ,π* character of the carbonyl chromophore." @default.
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- W2019061946 date "2011-12-01" @default.
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- W2019061946 title "Photochemistry of thioxanthen-9-one-10,10-dioxide: A remarkably reactive triplet excited state" @default.
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- W2019061946 doi "https://doi.org/10.1016/j.jphotochem.2011.10.010" @default.
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