Torsional barriers for planar versus twisted singlet styrenes

Frederick D Lewis*, Xiaobing Zuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Kinetic modeling of the temperature-dependent lifetimes of styrene and several methyl-substituted styrenes has been used to obtain the torsional barriers for singlet-state C=C rotation. The barrier for C=C torsion is found to be correlated with the ground-state phenyl-vinyl dihedral angle, φ, planar styrenes having barriers of ∼6.5 kcal/mol and moderately twisted styrenes having smaller barriers. Highly twisted styrenes undergo exceptionally rapid intersystem crossing. This unexpected dependence of excited-state behavior on φ is attributed to a change in the character of the excited states from delocalized for planar styrenes to localized for highly twisted styrenes.

Original languageEnglish (US)
Pages (from-to)2046-2047
Number of pages2
JournalJournal of the American Chemical Society
Issue number8
StatePublished - Feb 26 2003

ASJC Scopus subject areas

  • Chemistry(all)


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