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• W2012062800 abstract "Abstract The luminescence of pyrene solubilized in anionic sodium n-alkyl sulfate (NaC n S, n =10, 12) and cationic trimethyl-n-alkyl-ammonium bromide (C n TABr, n =10, 12, 14, 16) micelles was studied using zero field optically detected magnetic resonance (ODMR) at cryogenic temperatures and fluorescence quenching techniques at room temperature. The values of triplet state phosphorescence wavelengths and zero-field splitting parameters D in the micelles are consistent with a pyrene microenvironment which is intermediate in polarity and polarizability between an alkyl chain-like environment and an aqueous solvent. The triplet state properties vary reproducibly with surfactant chain length, indicating slight differences in the pyrene environment in the different micelles, but there are no monotonic trends. Pyrene phosphorescence and fluorescence lifetimes in the C n TABr micelles are shortened by the external heavy atom effect of the bromide counterions; the C 10 TABr micelle shows the shortest lifetimes, indicating enhanced counterion proximity to pyrene. Quenching of pyrene fluorescence by added acrylamide was measured for the C n TABr micelles by both steady state and fluorescence decay methods. The apparent dynamic quenching constant in the micelles is nearly three orders of magnitude smaller than its value in aqueous solution, and shows a small but monotonic decrease with increasing surfactant chain length." @default.
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• W2012062800 date "1999-02-01" @default.
• W2012062800 modified "2023-10-14" @default.
• W2012062800 title "ODMR and fluorescence studies of pyrene solubilized in anionic and cationic micelles" @default.
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• W2012062800 doi "https://doi.org/10.1016/s0022-2313(98)00157-4" @default.
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