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Proceedings Paper

Internal Stark effect mediates intramolecular excited-state proton transfer in 3-hydroxyflavone derivatives
Author(s): Andriy S. Klymchenko; Alexander P. Demchenko
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Paper Abstract

Internal Stark effect in electronic spectra is the effect that is observed when the electronic bands shift udner the influence of promixal charges. In order to study the possible involvement of this effect in modulating the intramolecular proton transfer reactions in the excited state, we designed and studied several derivatives of 3-hydroxyflavone. They include the species containing neutral and positively charged substituents in 6 position of chromone ring. These compounds were studied in solvents of different polarities. In these experiments the shifts of both normal and tautomer flurosence bands are clearly observed in a manner predicted by Stark effect theory. In addition, a dramatic effect of suppression by introduced charge of intramolecular excited-state proton transfer was observed.

Paper Details

Date Published: 11 December 2002
PDF: 8 pages
Proc. SPIE 4938, Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals, (11 December 2002); doi: 10.1117/12.486637
Show Author Affiliations
Andriy S. Klymchenko, TUBITAK Marmara Research Ctr. (Turkey)
A.V. Palladin Institute of Biochemistry (Ukraine)
Alexander P. Demchenko, TUBITAK Marmara Research Ctr. (Turkey)
A.V. Palladin Institute of Biochemistry (Ukraine)


Published in SPIE Proceedings Vol. 4938:
Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals
Galina A. Puchkovska; Sergey A. Kostyukevych, Editor(s)

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