The triplet state of styrenes
- 1 January 1977
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 2,p. 182-185
- https://doi.org/10.1039/p29770000182
Abstract
The energy levels of the S1,S2 and T1 states of a range of cyclic and acyclic phenylalkenes have been determined and the structure–excited state energy level relationship examined. The S2(Franck–Condon maximum)–T1(absorption onset) energy gap is a constant for all the systems studied (189.5 ± 4 kJ mol–1). except the severely twisted cis-t-butylstyrene, and thus allows the determination of the triplet energy of simple phenylalkenes merely by obtaining the S0–Sn spectra. An extensive search for phosphorescence (on direct irradiation and triplet sensitisation) even at 10 K in a nitrogen matrix was unsuccessful and this may be interpreted in terms of a non-radiative relaxation requiring little molecular distortion.Keywords
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