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Research on Chemical Intermediates

, Volume 21, Issue 7, pp 735–747 | Cite as

Solvent and temperature effects on the fluorescence and competitive photoreactions of cis-9-styrylanthracene

  • Giampiero Bartocci
  • Anna Spalletti
  • Ugo Mazzucato
Article

Abstract

A fluorimetric and photochemical study of cis-9-styrylanthracene as a function of temperature has been carried out in different solvents with the aim of answering some open questions about the behavior of its first excited singlet state, S1. In non-polar solvents, a parallel photoreactive pathway, leading to a cyclization adduct, was found to compete with fluorescence and isomerization already at 200 K, its contribution increasing markedly with temperature. The cis » trans photoisomerization occurs prevalently by a triplet mechanism, a detectable contribution of diabatic and adiabatic isomerization in S1 being operative in these solvents from room temperature upwards. In polar solvents, the main deactivation pathway competitive with fluorescence is isomerization to trans, which occurs prevalently through a mixed singlet mechanism with a major diabatic and a minor adiabatic components.

Keywords

Polar Solvent Arrhenius Parameter Laser Flash Photolysis Isomerization Yield Triplet Mechanism 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 1995

Authors and Affiliations

  • Giampiero Bartocci
    • 1
  • Anna Spalletti
    • 1
  • Ugo Mazzucato
    • 1
  1. 1.Departimento di ChimicaUniversità di PerugiaPerugiaItaly

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