Comparative Study of the Photophysical Behavior of Fisetin in Homogeneous Media and in Anionic and Cationic Reverse Micelles Media
作者： Matías Funes , N. Mariano Correa , Juana J. Silber , M. Alicia Biasutti
DOI: 10.1562/2006-08-08-RA-1000
关键词: Cationic polymerization 、 Photochemistry 、 Fisetin 、 Benzene 、 Absorption (chemistry) 、 Excited state 、 Fluorescence 、 Molecule 、 Chemistry 、 Micelle
摘要: The 3,3', 4',7 tetrahydroxiflavone (fisetin) is a natural therapeutically active and fluorescent polyhydroxyflavone, with important spectroscopic biological behavior. Fisetin shows dual emission, normal band (N) from the S 1 → So transition one generated in excited state (phototautomer; PT) intramolecular proton transfer (ESIPT) process. influence of different interfaces on ESIPT process fisetin was investigated reverse micelles media (RMs) made anionic sodium 1,4-bis (2-ethylhexyl) sulfosuccinate (AOT) cationic benzyl n-hexadecyl dimethylammonium chloride (BHDC) surfactants, benzene. studies were carried out by absorption, emission spectroscopy, steady-state anisotropy time-resolved fluorescence measurements. behavior also homogeneous special emphasis water benzene, which are polar core organic pseudofase RMs, respectively. In addition, effect concentration benzene variation pH studied. Fluorescence lifetime measurements show that independent concentration, while it possible to detect aggregate species (Nas) formed ground state. allowed us identify (A - ) emission. RMs interacts specifically head always results diminishing PT. Also formation A detected particularly at W 0 > 0. Appreciable high values obtained as compared those fluid media, content confirming molecules anchored well interfaces.
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