期刊
DYES AND PIGMENTS
卷 80, 期 2, 页码 206-211出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2008.05.014
关键词
Resazurin; Resorufin; Direct micelle; Reverse micelle
资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas [PIP 5605, 5909]
- Agencia Nacional de Promocion Cientifica [PICTO 30244/05, PICT 32351/05]
- Universidad Nacional de Rio Cuarto, Argentina
The photophysics of the phenoxazin-3-one dyes resazurin and resorufin was studied in a micellar solution of cetyltrimethylammonium chloride and in reverse micelles of 1,4-bis(2-ethylhexyl)sulfosuccinate and benzylhexadecyldimethylammonium chloride. Absorption and fluorescence emission spectra, as well as fluorescence lifetimes and T-T transient absorption spectra were determined as a function of surfactant concentration. In the presence of direct micelles of cetyltrimethylammonium chloride, both dyes displayed red shifts in the absorption and fluorescence spectra together with a simultaneous fluorescence lifetime increase. The electrostatic attraction between the anionic dyes and the positive micellar interface favors the location of the dyes closer to the head groups of the surfactant molecules. In reverse micellar systems the spectral properties depended upon the charge of the surfactant and water content. In the case of 1,4-bis(2-ethylhexyl)sulfosuccinate, at low water content both dyes were incorporated into the interface; as the water content increased their spectral properties tended to those in pure water. In contrast, in the case of cationic surfactant, the dyes were located in the interfacial pseudophase as a result of electrostatic interactions. (C) 2008 Elsevier Ltd. All rights reserved.
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