Monatshefte für Chemie / Chemical Monthly

, Volume 107, Issue 3, pp 783–791 | Cite as

Die multiple Fluoreszenz des 2,5-Dioxo-8-hydroxy-2H,5H-pyrano[3,2-c][1]benzopyran-3-carbonsäure-äthylesters Lumineszierende Heterocyclen, 1. Mitt

  • Otto S. Wolfbeis
Organische Chemie und Biochemie

On the multiple fluorescence of Ethyl 2,5-dioxo-8-hydroxy-2H,5H-pyrano[3,2-c][1]benzopyran-3-carboxylate


The title compound and the corresponding methyl ester have been synthesized in two steps starting from 4,7-dihydroxycoumarin. Both exhibit strong fluorescence in the visible. The wavelength of the maximum is dependent on solvent and pH of the solution. Emission is occurring from three species apparently: The first excited singlet state (at 445 nm), the excited anion (at 525 nm) and from a phototautomer at 468 nm. Solutions of the compound show laser activity.


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Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • Otto S. Wolfbeis
    • 1
  1. 1.Institut für Organische ChemieUniversität GrazGrazÖsterreich

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