Rotational Diffustion and Trans-cis Isomerization of Substituted Diphenyl Polyenes in the Compressible Region of Supercritical Fluids
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We examine rotational diffusion and trans-cis isomerization of two diphenyl polyenes, diphenylbutadiene (DPB) and hydroxymethyl-stilbene (HMS) in supercritical fluid CO<SUB>2</SUB> and ethane. The results of density dependent rotational diffusion measurements are interpreted using a model which we have recently developed for rotational diffusion in compressible fluids. Comparison of DPB and HMS fluorescence lifetimes indicate that the rate of the isomerization reaction of DPB is nearly independent of density while HMS exhibits a strong density dependence in CO<SUB>2</SUB>. Analysis of the HMS data using Kramers theory indicates that the density dependence is the result of solvent-solute frictional interactions.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 1225-1229, 1998
The Japan Society of High Pressure Science and Technology