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Probing solute-solvent interaction in 1-ethyl-3-methylimidazolium-based room temperature ionic liquids: A time-resolved fluorescence anisotropy study

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Abstract

Rotational diffusion of two organic solutes, coumarin153 (C153) and 4-aminophthalimide (AP) has been investigated in four ionic liquids (ILs), viz. 1-ethyl-3-methylimidazolium trifluoroacetate (EMIMTFA), 1-ethyl-3-methylimidazolium ethylsulfate (EMIMESU), 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMTFB) and 1-ethyl-3-methylimidazolium tetracyanoborate (EMIMTCB), as a function of temperature. Between the two probes, AP can act as hydrogen-bond-donor to the solvents having hydrogen bond acceptor ability. The results indicate that the rotational dynamics of C153 is mainly governed by the viscosity of the medium. On the other hand, the rotational motion of AP is found to be significantly hindered in the ILs depending on the nature of anions of the ILs. Rotational coupling constant values for AP in the ILs follow the order TFA > ESU > TCB > TFB. The slower rotational motion of AP in these ILs has been attributed to the specific hydrogen bonding interaction between AP and anions of ILs.

Rotational diffusion of two organic solutes, coumarin153 (C153) and 4-aminophthalimide (AP) has been investigated in four different ionic liquids (ILs) so as to monitor the effects of anions on the rotational dynamics of the solutes exclusively. Figure showing the anisotropy decay profile of AP at 293 K in two isoviscous room temperature ionic liquids having different hydrogen bond acceptors ability

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Acknowledgements

M.S. thanks the Department of Science and Technology (DST) for generous research grant. S.K.D is thankful to Council of scientific and Industrial Research (CSIR) for a fellowship.

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  1. School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar, 751005, India

    Sudhir Kumar Das & Moloy Sarkar

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Das, S.K., Sarkar, M. Probing solute-solvent interaction in 1-ethyl-3-methylimidazolium-based room temperature ionic liquids: A time-resolved fluorescence anisotropy study. J Fluoresc 24, 455–463 (2014). https://doi.org/10.1007/s10895-013-1311-x

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