Is isomerization in highly viscous solvents under pressure understandable with the idea of frequency-dependent friction?

Thermal Z/E isomerization of substituted N-benzylideneanilines realizes both the transition state theory regime at low pressures and the solvent fluctuation control regime at high pressure (where the rate constant kobs decreases with the solvent viscosity η). The kobs were fitted to the Grote-Hynes theory based on the idea of frequency-dependent friction. The above-mentioned situation allows us to derive the correlation time τsc of random frictional forces through solvent microscopic motions in the generalized Langevin equation. At η ⪆ 102 Pa s, we get τsc ⪆ 0.1 μs, which is too long to justify the theory.