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Novel Cyclic Sulfonium-Based Ionic Liquids: Synthesis, Characterization, and Physicochemical Properties

Authors

  • Qinghua Zhang Dr.,

    1. Centre for Green Chemistry and Catalysis, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000 (China), Fax: (+86) 931-496-8116
    2. Graduate School of the Chinese Academy of Sciences, Beijing, 100039, PRC (China)
    3. School of Information Science and Engineering and The National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, 73000 (China)
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  • Shimin Liu,

    1. Centre for Green Chemistry and Catalysis, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000 (China), Fax: (+86) 931-496-8116
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  • Zuopeng Li,

    1. Centre for Green Chemistry and Catalysis, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000 (China), Fax: (+86) 931-496-8116
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  • Jian Li,

    1. Centre for Green Chemistry and Catalysis, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000 (China), Fax: (+86) 931-496-8116
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  • Zhengjian Chen,

    1. Centre for Green Chemistry and Catalysis, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000 (China), Fax: (+86) 931-496-8116
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  • Ruifeng Wang,

    1. Centre for Green Chemistry and Catalysis, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000 (China), Fax: (+86) 931-496-8116
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  • Liujin Lu,

    1. Centre for Green Chemistry and Catalysis, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000 (China), Fax: (+86) 931-496-8116
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  • Youquan Deng Prof.

    1. Centre for Green Chemistry and Catalysis, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000 (China), Fax: (+86) 931-496-8116
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Abstract

A new series of ionic liquids composed of three cyclic sulfonium cations and four anions has been synthesized and characterized. Their physicochemical properties, including their spectroscopic characteristics, ion cluster behavior, surface properties, phase transitions, thermal stability, density, viscosity, refractive index, tribological properties, ion conductivity, and electrochemical window have been comprehensively studied. Eight of these salts are liquids at room temperature, at which some salts based on [NO3] and [NTf2] ions exhibit organic plastic crystal behaviors, and all the saccharin-based salts display relatively high refractive indices (1.442–1.594). In addition, some ionic liquids with the [NTf2] ion exhibit peculiar spectroscopic characteristics in FTIR and UV/Vis regions, whilst those salts based on the [DCA] ion show lower viscosities (34.2–62.6 mPa s at 20 °C) and much higher conductivities (7.6–17.6 mS cm−1 at 20 °C) than most traditional 1,3-dialkylimidazolium salts.

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