Debdeep Chakrabarty

Solvation dynamics of Coumarin 153 in aqueous and non-aqueous reverse micelles

The solvation dynamics of water, methanol and acetonitrile in n-heptane/AOT/water, n-heptane/AOT/methanol and n-heptane/AOT/acetonitrile reverse micelles have been investigated by picosecond time-resolved emission spectroscopy using rigid and neutral probe, Coumarin 153 (C-153). We have observed a substantially slow dynamics (order of few nanosecond) in all the three reverse micelles compared to pure solvents. The w dependency of solvation time is observed in case of water and methanol reverse micelles. However, a very little w dependency is observed in case of acetonitrile reverse micelles. Moreover, fluorescence anisotropy measurements are used to characterize rotational motion of C-153 in all the three reverse micelles.

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.