Abstract
Multifrequency phase-modulation fluorescence spectroscopy is used to study the photophysics of a polar, environmentally-sensitive fluorescent probe, 6-propiony1-2-dimethylaminonaphthalene (PRODAN), in near- and supercritical CF 3H. The results show evidence for the simultaneous existence of an array of molecular environments about the PRODAN probe. In turn this indicates that the CF 3H clusters or aggregates, that form in the highly compressible region near the critical point, do not exist in a discrete form, that is, there may be an ensemble of cluster sizes being investigated by the PRODAN probe. These results demonstrate for the first time: 1) the use of time-resolved fluorescence spectroscopy as a tool to determine the dynamics of solute-fluid interactions in supercritical fluids and 2) evidence of lifetime distributions for a simple fluorophore dissolved in a neat solvent system.
Published Version
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