Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7832030 | Acta Physico-Chimica Sinica | 2007 | 5 Pages |
Abstract
Absorption and excited state intramolecular proton transfer (ESIPT) fluorescence of 2â²-ethylhexyl salicylate (EHS) were examined in the presence of cationic, non-ionic, and anionic surfactants. It was found that linear EHS molecule was solubilized in micelles with its flexible and hydrophobic 2â²-ethylhexyl chain toward the micellar core and with its rigid salicyl moiety toward the micelle-water interface. The UV absorption of EHS was improved and the intramolecular hydrogen bonding formation of EHS was favored, resulting in greatly enhanced ESIPT fluorescence. The excited EHS molecules decay via visible luminescence and non-radiative deactivation. The binding sites of EHS in micelles were explained at a molecular level in terms of molecular structures and sizes of EHS and surfactants. Dynamic fluorescence quenching and spectral measurements of ester hydrolysis of EHS provide further evidences for the binding sites of EHS in different micelles.
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Authors
Chun Wang, Xinzhen Du, Ning Ding, Yan Yang, Xiaoquan Lu, Hui Chen,