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Oscillations of the lophyl radical concentration during the photodecomposition of o-Cl-hexaarylbisimidazole

Schrödner, M.; Schache, H.; Lindauer, H.; Schrödner, Roland LU and Konkin, A. (2012) In Journal of Photochemistry and Photobiology A: Chemistry 233. p.60-64
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.
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Lophyl radical, photoreaction, Oscillating reaction, ESR, Hexaarylbisimidazole
in
Journal of Photochemistry and Photobiology A: Chemistry
volume
233
pages
60 - 64
publisher
Elsevier
external identifiers
  • scopus:84859189674
ISSN
1873-2666
DOI
10.1016/j.jphotochem.2012.02.013
language
English
LU publication?
no
id
6bab90d0-bed2-44ed-9ae3-15243ea78778
date added to LUP
2017-07-05 15:32:05
date last changed
2017-08-09 15:25:14
@article{6bab90d0-bed2-44ed-9ae3-15243ea78778,
  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.},
  author       = {Schrödner, M. and Schache, H. and Lindauer, H. and Schrödner, Roland and Konkin, A.},
  issn         = {1873-2666},
  keyword      = {Lophyl radical,photoreaction,Oscillating reaction,ESR,Hexaarylbisimidazole},
  language     = {eng},
  pages        = {60--64},
  publisher    = {Elsevier},
  series       = {Journal of Photochemistry and Photobiology A: Chemistry},
  title        = {Oscillations of the lophyl radical concentration during the photodecomposition of o-Cl-hexaarylbisimidazole},
  url          = {http://dx.doi.org/10.1016/j.jphotochem.2012.02.013},
  volume       = {233},
  year         = {2012},
}