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

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Abstract

In this paper we have reported the solvent and rotational relaxation of 1-butyl-3-methyl-imidazolium hexafluorophosphate ([bmim][PF6]) confined in tween 20/([bmim][PF6]/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][PF6] molar ratio). This is due to the fact that with increase in [bmim][PF6] content of the microemulsions, the microviscosity of the pool of the microemulsions increases, and motion of ions of [bmim][PF6] 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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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology, Kharagpur, 721 302, India

    Debabrata Seth, Palash Setua, Anjan Chakraborty & Nilmoni Sarkar

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  1. Debabrata Seth
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  2. Palash Setua
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  3. Anjan Chakraborty
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  4. Nilmoni Sarkar
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Correspondence to Nilmoni Sarkar.

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Seth, D., Setua, P., Chakraborty, A. et al. Solvent relaxation of a room-temperature ionic liquid [bmim][PF6] confined in a ternary microemulsion. J Chem Sci 119, 105–111 (2007). https://doi.org/10.1007/s12039-007-0017-5

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