Oscillations of the lophyl radical concentration during the photo-decomposition of o-Cl-hexaarylbisimidazole

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• 作者：M. Schrö ; dner^a ; ^{schroedner@titk.de} ; H. Schache^a ; H. Lindauer^a ; R. Schrö ; dner^b ; A. Konkin^c
• 关键词：Lophyl radical ; Photoreaction ; Oscillating reaction ; ESR ; Hexaarylbisimidazole
• 刊名：Journal of Photochemistry and Photobiology A ; Chemistry
• 出版年：2012
• 期刊代码：66_10106030
• 类别：ch
• 出版时间：1 April, 2012
• 卷：233
• 期：Complete
• 页码：60-64
• 文件大小：568 K

摘要

Hexaarylbisimidazole (HABI) is a well established photoinitiator in the graphics industry which undergoes in the absence of other reaction partners a fully reversible homolytic bond cleavage into two lophyl radicals L. Surprisingly we now found oscillations of the radical concentration at low temperature in a solution of o-Cl-HABI in toluene, which is an indication of a more complex photochemistry of the HABI/lophyl system. Furthermore this reaction is a very simple example of an oscillating chemical system working under non-flow conditions which involves only one initial reactant. A possible reaction mechanism based on kinetic simulations is proposed.