Influence of methoxy substitution on flavonoid photophysics: a steady state and laser flash photolysis study

Autor:	Wilhelm J. Baader, Vicente G. Toscano, Marcelo Christoff
Rok vydání:	1996
Předmět:	Chemistry General Chemical Engineering General Physics and Astronomy Electron donor General Chemistry Photochemistry Hydrogen atom abstraction Acceptor Electron transfer chemistry.chemical_compound Intramolecular force Flash photolysis Steady state (chemistry) Phosphorescence
Zdroj:	Journal of Photochemistry and Photobiology A: Chemistry. 101:11-20
ISSN:	1010-6030
Popis:	A comparative study of the photophysical properties of three flavonoids (flavone (F), 7-methoxyflavone (7MF) and 3-methoxyflavone (3MF)), which may serve as models for naturally occurring flavonoids, shows a distinct behaviour of the 3-methoxy derivative. Steady state and transient spectroscopic investigations reveal an almost quantitative formation of the triplet states of F and 7MF, which can be observed as transient absorptions and show electron donor and acceptor properties. In contrast, 3MF shows reduced triplet formation, and the transient observed is identified as a 1,4-biradical, formed by intramolecular hydrogen abstraction, which behaves as an electron donor.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6341c0ea2ebc2259791f85f61db90a35 https://doi.org/10.1016/s1010-6030(96)04422-x Zobrazit plný text záznamu Full Text from ScienceDirect