Abstract
The noncoincidence of the 0–0′ and 0′—0 absorption and fluorescence bands in many complex organic molecules in solution has been attributed to work of reorientation of solvent dipoles under the influence of the changed dipole of the excited solute. It has been found experimentally that the effect usually diminishes in low-temperature rigid glasses, but whether this is due to the prohibition of molecular reorientation or actually represents a temperature-induced spectral change is not uniquely established in this type of experiment. We have separated the effects of viscosity and temperature by studying solutions of fluor molecules in polymers. As might be expected, the viscosity effect far outweighs that of temperature.
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