Photochemistry in the Adsorbed Layer. V. Effects of Surface Pretreatments upon the Photolysis of Adsorbed 2-Pentanone
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概要
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The effects of surface pretreatment upon the photolysis as well as the absorption and phosphorescence spectra of 2-pentanone adsorbed on porous Vycor glass have been investigated. The rate of propane formation (Norrish type I reaction) passes through a maximum and then decreases at higher degassing temperatures, while that of ethylene formation (Norrish type II reaction) decreases with increasing degassing temperature. Simultaneously, the phosphorescence intensity increases while the blue shift of the (n,π<SUP>*</SUP>) band decreases. This suggests that with a rise in degassing temperature the triplet lifetime increases while the surface polarity decreases. Thus, the decrease in the rate of ethylene formation is attributed to destabilization of the 1,4-biradicals formed by the intramolecular hydrogen abstraction, and the decrease in the rate of propane formation to the decrease in the lifetime of the <I>n</I>-propyl radicals, the hydrogen abstraction efficiency, and the probability of α-cleavage.
- 公益社団法人 日本化学会の論文
著者
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Anpo Masakazu
Department Of Applied Chemistry Colledge Of Engineering University Of Osaka Prefecture
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Wada Toshiaki
Department Of Applied Physics Tokyo University Of Agriculture And Technology:(present Address) Depar
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Kubokawa Yutaka
Department of Applied Chemistry College of Engineering University of Osaka Prefecture
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