Solvation dynamics of Coumarin 152A in methanol and acetonitrile reverse micelles

In this Letter we have reported solvation dynamics of methanol and acetonitrile in n-heptane/AOT/methanol and n-heptane/AOT/acetonitrile reverse micelles using Coumarin 152A (C-152A) as a probe. The solvation dynamics is retarded almost several thousand times compared to pure solvents. In case of methanol reverse micelle, the solvation time depends on w value. However, a very little w dependence of solvation dynamics is observed in case of acetonitrile reverse micelle. The different features of solvation dynamics in methanol and acetonitrile reverse micelles are explained on the basis of presence and absence of intermolecular hydrogen bonding network. (C) 2002 Elsevier Science B.V. All rights reserved.