The effect of solvent environment on molecular electronic transition moment directions: Symmetry lowering in pyrene

Publisher Website
Google Scholar
Abstract
Measurements of polarized fluorescence and phosphorescence of pyrene, 2‐fluoropyrene, and 2‐methylpyrene in 3‐methylpentane glass at 77 K reveal significant differences among the three molecules. These are interpreted in terms of solvent‐induced mixing of the Lb and La states. It is proposed that such symmetry‐lowering effects of the solvent environment may well be important contributors to the often observed discrepancies between the theoretical limiting values of polarization ratios and the values actually observed.