Quantitative Description of the Deactivation Channels of the First Excited Singlet State of 2- and 4-Thiosalicylic Acids
作者： Yasser M. Riyad , Ralf Hermann , Ortwin Brede
DOI: 10.1021/JP051935A
关键词: Absorption spectroscopy 、 Singlet fission 、 Radical 、 Intersystem crossing 、 Photochemistry 、 Triplet state 、 Excited state 、 Internal conversion (chemistry) 、 Flash photolysis 、 Chemistry
摘要: On the bases of picosecond and nanosecond laser flash photolysis with detection by emission absorption spectroscopy, a quantitative description is given all deactivation channels first excited singlet state 2- ands 4-thiosalicyclic acids (TS) such as fluorescence, intersystem crossing (ISC), chemical dissociation into radicals, radiationless internal conversion (IC). For this purpose, investigated compounds were studied in solvents increasing polarity: 1-chlorobutane, acetonitrile, ethanol, water. As an exception for thiols, contrast to recent findings on thiophenol its methyl- methoxy-substituted derivatives, photoinduced triplet thiosalicyclic was directly observed T1−Tn spectra characterized sensitization experiments. According direct determination quantum yields 4-thiosalicylic acid isomers, it f...
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