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http://dx.doi.org/10.5012/bkcs.2014.35.3.828

Spectroscopic Properties of Quercetin in AOT Reverse Micelles  

Park, Hyoung-Ryun (Department of Chemistry and Research Institute of Basic Science, Chonnam National University)
Im, Seo-Eun (Department of Chemistry and Research Institute of Basic Science, Chonnam National University)
Seo, Jung-Ja (Department of Chemistry and Research Institute of Basic Science, Chonnam National University)
Bark, Ki-Min (Department of Chemical Education, and Research Institute of Life Science, Gyeongsang National University)
Publication Information
Bulletin of the Korean Chemical Society / v.35, no.3, 2014 , pp. 828-832 More about this Journal
Abstract
The spectroscopic properties of quercetin (QCT) were studied in the AOT reverse micelle by fluorescence spectroscopy. Because the molecular structure of QCT is completely planar, excited state intramolecular proton transfer (ESIPT) occurs between the -OH at C(5) and carbonyl oxygen via intramolecular hydrogen bonding. This ESIPT happens at the $S_1$ state but not at the $S_2$ state. Because QCT is a good donor-acceptor-conjugated molecule at the excited state, this molecule can emit strong fluorescence but shows no $S_1{\rightarrow}S_o$ emission due to this ESIPT. Since the $S_2{\rightarrow}S_1$ internal conversion was very slow due to the small Franck-Condon factors, $S_2{\rightarrow}S_o$ fluorescence emission was observed. All of the experimental results indicated that the QCT resided at the bound water interface and that the position of solute did not change significantly in the micelle at various water concentrations.
Keywords
Quercetin; Fluorescence quantum yield; Fluorescence lifetime; AOT reverse micelle; Intramolecular proton transfer;
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