Abstract
Quenching of the n-(9-anthroyloxy) stearic acids ( n = 2, 6, 9, and 12) fluorescence by water is used to evaluate the water content in the vicinity of the anthroate chromophore in micelles of sodium dodecyl sulfate (SDS), dodecyltrimethylammonium chloride (DTAC), and Triton X-100. The mean locations of the probes in the three micelles are evaluated from the ring current effects of the anthracene ring on the 1H-NMR resonances of the surfactant protons. It is found that there is practically no water in the hydrocarbon core of the Triton X-100 and the DTAC micelles while in SDS micelles water seems to penetrate further down to the β carbon of the surfactant molecule. Water concentrations obtained from fluorescence decays are compared with those obtained from the response of the emission spectra of the same probes to changes in the solvent polarity.
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