Elsevier

Chemical Physics Letters

Volume 68, Issues 2–3, 15 December 1979, Pages 382-385
Chemical Physics Letters

Excited state proton-transfer spectroscopy of 3-hydroxyflavone and quercetin☆

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Abstract

The yellow-green luminescence of 3-hydroxyflavone and quercetin at room temperature in solution arises from a tautomer of the molecules produced by excited state proton-transfer across a barrier in the double-minimum hydrogen-bonding potential. At 77 K in 2-methylbutane rigid matrix, a normal UV-violet fluorescence is observed in correspondence with the UV absorption. Excitation spectra and deuteration effects confirm the mechanism.

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☆

This work was supported by a contract between the Division of Biomedical and Environmental Research, Department of Energy, U.S. and the Florida State University.

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