Photochemistry in solution-XX
作者： J. Kossanyi , S. Sabbah , P. Chaquin , J.C. Ronfart-Haret
DOI: 10.1016/S0040-4020(01)92378-6
关键词: Quenching (fluorescence) 、 Aldehyde 、 Flash photolysis 、 Benzophenone 、 Singlet state 、 Photochemistry 、 Chemistry 、 Absorption (chemistry) 、 Intersystem crossing 、 Triplet state
摘要: Abstract The triplet self-quenching process of three aliphatic aldehydes has been investigated by inhibition with dienes (taking into account the singlet interaction dienes) and laser flash photolysis. results obtained for intersystem crossing, setf-quenching product formation have rationalized. main reactivity observed is which occurs from both state. photolysis experiments carried out butanal show two absorptions a transient at 320 aod 355 nm; no evidence different species could be put forward. similar decay absorption maximas transient, as concentration aldehyde increased, would indicative only one single absorbing either state or radical-pair formed 1,4-biradical resulting γ-H abstraction. fact that quenching (by 1-methylnaphthalene) measurements lead to about same lifetime also indicates species. products method: excitation benzophenone 365 nm in presence butanal. quantum yields those direct irradiation butanal, except octane-4,5-dione increased if photoreaction beazophenone.
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