The rotational and translational mobility of various fluorescent probes in micelles of Triton X 100/water is unexpectedly higher than in the pure liquid detergent. The intramicellar mobility of small probes is higher than that of larger probes and is still pronounced well below the freezing point of the pure detergent. This peculiar intramicellar mobility near the freezing point is reflected by fluorescence anisotropy and excimer formation. The rotational mobility, which is spherical in homogeneous solution, is anisotropic in the micelles, but this behaviour is not pronounced. © 1987.
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