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Effects of Water Content on Physicochemical Properties of a Protic Ionic Liquid with Monoprotic N-Hexylethylenediaminium as Cation and Bis(trifluoromethylsulfonyl) Imide as Anion

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Abstract

The effects of water content on physicochemical properties such as density, dynamic viscosity, and electrical conductivity of HHexen(Tf2N), composed of monoprotic N-hexylethylenediaminium as cation and bis(trifluoromethylsulfonyl) imide as anion, were studied in the temperature range T = 303.15–353.15 K. HHexen(Tf2N) was dissolved a small amount of water (up to 6.53 wt%, corresponding to w0 = [H2O]/[PIL] = 1.65) as it is a hydrophobic protic ionic liquid (PIL). The physicochemical properties of HHexen(Tf2N) were significantly influenced by its water content. The temperature dependence of the physicochemical properties at different water contents (0.50 wt%, 0.95%, 1.93%, 3.02%, 4.03%, 5.14% and 5.95%, corresponding to w0 = 0.12, 0.23, 0.47, 0.74, 1.0, 1.28 and 1.50, respectively) were studied. With an increase in the water content, the density and dynamic viscosity decreases while the electric conductivity increases in a given temperature range. The Walden lines of HHexen(Tf2N) show a good ionic character as the curves are all located in the range of ΔW = 0.5 ± 0.2 (ΔW = log101/η −log10 Λ) at different water contents. The ionicity shows an increasing trend with an increase of water content; this is evident when the water content rises to approximately 4.0% (w0 = 1.0). Additionally, HHexen(Tf2N) was used to extract Co(II) ions from an aqueous solution. Inductive coupled plasma emission spectrometry results showed that more than 99.5 wt% of Co(II) ions moved from the 100 mmol·kg−1 aqueous layer to the HHexen(Tf2N) layer (of equal volume). After extraction of the Co(II) ions, the PIL layer contained 7.90% of water (w0 = 2.0).

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Acknowledgements

This work was financially supported by the Foundation of Ningxia Higher Education (Project Number: NGY2020063). We are also grateful to Prof. Masayasu Iida of Nara Women’s University for the helpful discussion. We would like to thank Editage (www.editage.com) for English language editing.

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Authors and Affiliations

  1. Chemical Science and Engineering College, North Minzu University, 204 Wenchang North Street, Xixia District, Yinchuan, 750021, Ningxia, China

    Er Hua, Zheng Liu & Liling Qin

  2. Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, 204 Wehchang North Street, Xixia District, Yinchuan, 750021, Ningxia, China

    Er Hua

  3. Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, 204 Wenchang North Street, Xixia District, Yinchuan, 750021, Ningxia, China

    Er Hua

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Hua, E., Liu, Z. & Qin, L. Effects of Water Content on Physicochemical Properties of a Protic Ionic Liquid with Monoprotic N-Hexylethylenediaminium as Cation and Bis(trifluoromethylsulfonyl) Imide as Anion. J Solution Chem 50, 503–516 (2021). https://doi.org/10.1007/s10953-021-01067-6

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