Influence of micellar size on the decay of triplet-derived radical pairs in micelles

Download
  1. Get@NRC: Influence of micellar size on the decay of triplet-derived radical pairs in micelles (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1021/ja00027a020
AuthorSearch for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of the American Chemical Society
ISSN0002-7863
Volume114
Issue1
Pages140146; # of pages: 7
AbstractThe photoreduction of butyrophenone by α-tocopherol in anionic micelles has been examined by laser flash photolysis. The reaction leads to a triplet-derived radical pair that decays by a competition of escape processes and geminate reactions. The dependence of both processes on the surfactant's chain length, the addition of electrolytes, and the temperature were examined in detail. The rate constants for radical exit from the micelles (k-) follow Arrhenius-type behavior; for example, the exit from sodium dodecyl sulfate micelles occurs with an activation energy of 6.5 kcal/mol and log (A/s-1) = 10.7. The results suggest that entropy plays an important role in determining the dynamics of escape processes. The rate constants for geminate reaction (kgem are largely determined by the size of the micelles. Both spin evolution and the frequency of reencounters are important in controlling geminate processes. For the radical pair examined, spin evolution is believed to be controlled by hyperfine couplings, while the frequency of reencounters depends upon micellar size and intramicellar diffusion dynamics.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21276512
Export citationExport as RIS
Report a correctionReport a correction
Record identifier67b3a597-8735-48a3-83f0-44e940d661de
Record created2015-10-13
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)