| Popis: |
The time-resolved fluorescence anisotropy of 1,6-diphenyl-1,3,5-hexatriene (DPH), 3-[p-(6-phenyl-1,3,5-hexatrienyl)phenyl] propionic acid (CE-DPH), and its methyl ester (MCE-DPH) has been studied, after excitation with ultrastable synchrotron pulses, in paraffin oil as a function of temperature (2-33 o C) and viscosity (0.9-4.9 P). The maximum entropy analysis of the polarized intensities resulted in two very different relaxation times and preexponential factors, which may be explained if the absorption and emission electronic transition moments are collinear and inclined a small angle (10-14 o ) relative to the long inertial axis of the rotating molecules |
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