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| - Dynamics of Solvent and Rotational Relaxation of Coumarin 153 in Room-TemperatureIonic Liquid 1-Butyl-3-methylimidazolium Hexafluorophosphate Confined in Brij-35Micelles: A Picosecond Time-Resolved Fluorescence Spectroscopic Study
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| - The dynamics of solvent and rotational relaxation of Coumarin 153 (C-153) in ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) and in the ionic liquid confined in Brij-35 micellaraggregates have been investigated using steady-state and time-resolved fluorescence spectroscopy. We observedslower dynamics in the presence of micellar aggregates as compared to the pure IL. However, the slowingdown in the solvation time on going from neat IL to IL-confined micelles is much smaller compared to thaton going from water to water-confined micellar aggregates. The increase in solvation and rotational time inmicelles is attributed to the increase in viscosity of the medium. The slow component is assumed to bedependent on the viscosity of the solution and involves large-scale rearrangement of the anions and cationswhile fast component is assumed to originate from the initial response of the anions during excitation. Theslow component increases due to the increase in the viscosity of the medium and increase in fast componentis probably due to the hydrogen bonding between the anions and polar headgroup of the surfactant. Thedynamics of solvent relaxation was affected to a small extent due to the micelle formation.
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