Intramolecular charge transfer processes and solvation dynamics of coumarin 490 in reverse micelles

The relative retardation of intramolecular charge transfer (ICT) rate and s olvation dynamics of coumarin 490 (C-490) in the water pool of the Aerosol OT (AOT)-heptane reverse micelle compared to normal water have been investi gated using picosecond time resolved emission spectroscopy. We have observe d a maximum 3.5 times change in the ICT rate of C-490 in the water pool of the reverse micelle compared to normal water. The retardation of ICT rate i s much smaller compared to the several thousands fold decrease in the solva tion dynamics in the water pool of the reverse micelle compared to pure wat er. (C) 2001 Elsevier Science B.V. All rights reserved.