Dynamics of solvent relaxation in room temperature ionic liquids

Chakrabarty, Debdeep; Hazra, Partha; Chakraborty, Anjan; Seth, Debabrata; Sarkar, Nilmoni

doi:10.1016/j.cplett.2003.10.029

Cited by 129 publications

(164 citation statements)

References 33 publications

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“…RTILs are composed solely of ions, a bulky organic cation and non coordinating anions. Several experimental, theoretical and simulation studies have been carried out in RTILs [3][4][5][6][7]. The cations and anions of RTILs are composed of charged head group with nearly unit net charge and a non polar tail group of an alkyl chain.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced intermolecular electron transfer in a room temperature imidazolium ionic liquid: An excitation wavelength dependence study

Sarkar

Pramanik

Ghatak

et al. 2011

Chemical Physics Letters

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Section: Introductionmentioning

confidence: 99%

Photoinduced intermolecular electron transfer in a room temperature imidazolium ionic liquid: An excitation wavelength dependence study

Sarkar

Pramanik

Ghatak

et al. 2011

Chemical Physics Letters

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“…The dynamic solvation and the reorientational behavior of several probe molecules in different ionic liquids have recently been investigated. [34][35][36][37][38][39] These workers have shown that the solvation dynamics is biphasic. A molecular dynamics simulation by Shim et al 40 has been interpreted in terms of the faster component corresponding to diffusional motion of the anion and the slower component corresponding to collective motion of the anion and the cation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Solvation in Room-Temperature Ionic Liquids

et al. 2004

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The dynamic solvation of the fluorescent probe, coumarin 153, is measured in five room-temperature ionic liquids using different experimental techniques and methods of data analysis. With time-resolved stimulatedemission and time-correlated single-photon counting techniques, it is found that the solvation is comprised of an initial rapid component of ∼55 ps. In all the solvents, half or more of the solvation is completed within 100 ps. The remainder of the solvation occurs on a much longer time scale. The emission spectra of coumarin 153 are nearly superimposable at all temperatures in a given solvent unless they are obtained using the supercooled liquid, suggesting that the solvents have an essentially glassy nature. The physical origin of the two components is discussed in terms of the polarizability of the organic cation for the faster one and the relative diffusional motion of the cations and the anions for the slower one. A comparison of the solvation response functions obtained from single-wavelength and from spectral-reconstruction measurements is provided. Preliminary fluorescence-upconversion measurements are presented against which the appropriateness of the single-wavelength method for constructing solvation correlation functions and the use of stimulated-emission measurements is considered. These measurements are consistent with the trends mentioned above, but a comparison indicates that the presence of one or more excited states distorts the stimulated-emission kinetics such that they do not perfectly reproduce the spontaneous emission data. Fluorescence-upconversion results indicate an initial solvation component on the order of ∼7 ps. December 2, 2003; In Final Form: April 20, 2004 The dynamic solvation of the fluorescent probe, coumarin 153, is measured in five room-temperature ionic liquids using different experimental techniques and methods of data analysis. With time-resolved stimulatedemission and time-correlated single-photon counting techniques, it is found that the solvation is comprised of an initial rapid component of ∼55 ps. In all the solvents, half or more of the solvation is completed within 100 ps. The remainder of the solvation occurs on a much longer time scale. The emission spectra of coumarin 153 are nearly superimposable at all temperatures in a given solvent unless they are obtained using the supercooled liquid, suggesting that the solvents have an essentially glassy nature. The physical origin of the two components is discussed in terms of the polarizability of the organic cation for the faster one and the relative diffusional motion of the cations and the anions for the slower one. A comparison of the solvation response functions obtained from single-wavelength and from spectral-reconstruction measurements is provided. Preliminary fluorescence-upconversion measurements are presented against which the appropriateness of the single-wavelength method for constructing solvation correlation functions and the use of stimulated-emission measurements is considered. These...

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“…[24][25][26] Various groups, including ours, also reported experimental studies of the nature of solvation dynamics in neat RTILs. [27][28][29][30][31][32][33][34][35][36][37][38] Solvation dynamics in RTIL-polar solvent mixtures were also investigated. [39][40][41] Red-edge effect was also established, both experimentally and theoretically in neat RTILs.…”

Section: Introductionmentioning

confidence: 99%

Solvent relaxation of a room-temperature ionic liquid [bmim][PF6] confined in a ternary microemulsion

et al. 2007

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In this paper we have reported the solvent and rotational relaxation of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF 6 ]) confined in tween 20/([bmim][PF 6 ]/water microemulsion using coumarin 153 (C-153) as probe. The most interesting feature of our experiment was that we observed an increase in solvent relaxation time with increase in R (R = tween 20-to-[bmim][PF 6 ] molar ratio). This is due to the fact that with increase in [bmim][PF 6 ] content of the microemulsions, the microviscosity of the pool of the microemulsions increases, and motion of ions of [bmim][PF 6 ] is hindered in the pool of microemulsions. Since motion of ions is responsible for solvation in room-temperature ionic liquids (RTILs), solvent-relaxation time increases with increase in R.

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Dynamics of solvent relaxation in room temperature ionic liquids

Cited by 129 publications

References 33 publications

Photoinduced intermolecular electron transfer in a room temperature imidazolium ionic liquid: An excitation wavelength dependence study

Photoinduced intermolecular electron transfer in a room temperature imidazolium ionic liquid: An excitation wavelength dependence study

Dynamic Solvation in Room-Temperature Ionic Liquids

Solvent relaxation of a room-temperature ionic liquid [bmim][PF6] confined in a ternary microemulsion

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