Reversible photoisomerization and fluorescence of bithioxanthene: Temperature and spin-orbit perturbation effects

R. Korenstein*, K. A. Muszkat, E. Fischer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

A detailed experimental study of the reversible photochemistry of bithioxanthene over a wide temperature range indicates the photoformation of two unstable isomers: E, absorbing at shorter wavelength, and P, absorbing at longer wavelengths. Both isomers revert thermally to the parent compound, A. E is formed through the triplet manifold while P is formed directly from the excited singlet state. The quantum yield for the A → E process is temperature dependent and is enhanced by molecular oxygen and by xenon. A low temperature proton n.m.r. analysis of the E and A forms indicates a structure for E which involves cis-trans isomerization about the 9-9′ central double bond and additional torsion about the four single bonds attached to it.

Original languageEnglish
Pages (from-to)345-353
Number of pages9
JournalJournal of Photochemistry
Volume5
Issue number5
DOIs
StatePublished - 1976
Externally publishedYes

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