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

Paper ID Volume ID Publish Year Pages File Format Full-Text
26332 43947 2012 5 PDF Available
Title
Oscillations of the lophyl radical concentration during the photo-decomposition of o-Cl-hexaarylbisimidazole
Abstract

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.

► Oscillations of the lophyl radical concentration during the photodecomposition of o-Cl-HABI at low temperature in a toluene solution were detected by ESR spectroscopy. ► Kinetic simulations including an autocatalytic step suggest the formation of intermediate radical adducts with solvent molecules, which is an indication of a more complex photochemistry of the HABI/lophyl system. ► This reaction is a very simple example of an oscillating chemical system working under non-flow conditions which involves only one initial reactant.

Keywords
Lophyl radical; Photoreaction; Oscillating reaction; ESR; Hexaarylbisimidazole
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Oscillations of the lophyl radical concentration during the photo-decomposition of o-Cl-hexaarylbisimidazole
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 233, 1 April 2012, Pages 60–64
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
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100% Money Back Guarantee
Full-text PDF Download
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