Abstract
Perylenc, 9,10-dimethylanthracene and 1,6-diphenyl-1,3,5-hexatriene (DPH) solubilized in a macroscopically aligned lyotropic nematic phase have been studied with linear dichroism (LD), steady-state and time-resolved fluorescence spectroscopy. From LD an order parameter of the fluorophore in its electronic ground state can be obtained, and from time-resolved polarized emission spectroscopy for its excited state. The order parameters of perylene in the ground and excited states are the same within experimental accuracy, but they are significantly different for 9,10-dimethylanthracene and DPH. It is concluded that the orientational distributions of fluorescent probe molecules in ground and excited states are generally not equal. Hence the order parameter of a fluorophore in a microscopically anisotropic and macroscopically isotropic system, e.g. a vesicle suspension, cannot generally be determined directly from the emission anisotropy.
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