文献类型：期刊文献

英文题名：Ultrafast excited state dynamics of two non-emissive flavonoids that undergo excited state intramolecular proton transfer in solution

作者：Han, Yunxia[1];Jia, Yanyan[2];Chen, Ziwei[1];Jin, Peipei[1];Jia, Menghui[1];Pan, Haifeng[1];Sun, Zhenrong[1];Chen, Jinquan[1,3]

机构：[1]East China Normal Univ, State Key Lab Precis Spect, Shanghai 200241, Peoples R China;[2]East China Univ Sci & Technol, Inst Fine Chem, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China

年份：2023

卷号：811

外文期刊名：CHEMICAL PHYSICS LETTERS

收录：;EI(收录号：20224813187621);WOS:【SCI-EXPANDED(收录号:WOS:000972840000001)】；

基金：This study was funded by the National Nature Science foundation of China (nos. 21873030, 92156024 and 91850202 to J. Chen and 61720106009 to Z. Sun) .

语种：英文

外文关键词：Luteolin; Quercetin; Ultrafast excited state dynamics; Excited state intramolecular proton transfer; Femtosecond transient absorption

摘要：Flavonoids have been proposed to be natural sunscreens that can provide protection against UV-induced damage in plant. In this study, excited state dynamics of luteolin and quercetin, two natural flavonoids with very low fluorescence quantum yields, were studied by combination of femtosecond transient absorption spectroscopy and quantum chemical calculations. We provide the first experimental demonstration of ultrafast ESIPT process in these two non-emissive flavonoids and proposed that rotation between B-and C-ring after ESIPT is the key to the ultrafast non-radiation decay channels in these two molecules, suggesting that they may indeed behave as natural sunscreens.