Intramolecular Charge Transfer Reaction, Polarity,
and Dielectric Relaxation in AOT/Water/Heptane Reverse Micelles: Pool Size Dependence
frequency range 0.01 <=n/GHz <=2 for these microemulsions at different
pool sizes (0 <=w0<=40 and AOT concentrations (0.1 <= c/M<=0.5) at 298.15 K have also been performed. At sufficient water content, a large dispersion with a relaxation time
of ~600 ps has been observed at ~300 MHz and attributed to the average reorientation of water molecules residing in the close vicinity of the polar interface of the AOT headgroup and n-heptane. The reorientation of these interfacial water molecules is probably responsible for the nanosecond component observed in numerous polar solvation dynamics experiments in these reverse micelles. Subsequently, the estimated polarity and the measured reorientational time scale have been used to explain the dramatic slowing down of the ICT reaction rate and its dependence on pool size in these confined environments.
|(c) 2008 Berger Georg|