title: Room temperature ionic liquid in confined media: a temperature dependence solvation study in [bmim][BF4]/BHDC/benzene reverse micelles.
abstract: In this work, we reported a detailed study of the solvation dynamics of coumarin-480 in [bmim][BF(4)]/BHDC/benzene reverse micelles (RMs) with varying [bmim][BF(4)]/BHDC molar ratio (R) 1.00, 1.25, 1.50, and also study the solvation dynamics at five different temperatures from 15 to 35 °C RMs at [bmim][BF(4)]/BHDC molar ratio 1.25 for the first time. The average solvation time constant becomes slightly faster with the increase in R values at a temperature 25 °C. The solvation dynamics of the RMs with R value 1.25 becomes faster with the increase in temperature. We have also investigated temperature-dependent solvation dynamics in neat [bmim][BF(4)]. The solvation dynamics in neat [bmim][BF(4)] has a substantial temperature effect but for the [bmim][BF(4)]/BHDC/benzene RMs the temperature effect on the solvation dynamics is not that significant. Time-resolved fluorescence anisotropy studies reveal a decrease in the rotational restriction on the probe with increasing temperature. Wobbling-in-cone analysis of the anisotropy data also supports this finding.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India.
authors.forename: Rajib
authors.initials: R
authors.lastname: Pramanik
authors.forename: Chiranjib
authors.initials: C
authors.lastname: Ghatak
authors.forename: Vishal Govind
authors.initials: VG
authors.lastname: Rao
authors.forename: Souravi
authors.initials: S
authors.lastname: Sarkar
authors.forename: Nilmoni
authors.initials: N
authors.lastname: Sarkar