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

  1. Qinghua Zhang Dr.1,2,3,
  2. Shimin Liu1,
  3. Zuopeng Li1,
  4. Jian Li1,
  5. Zhengjian Chen1,
  6. Ruifeng Wang1,
  7. Liujin Lu1,
  8. Youquan Deng Prof.1

Article first published online: 28 NOV 2008

DOI: 10.1002/chem.200800610

Issue

Chemistry - A European Journal

Chemistry - A European Journal

Volume 15, Issue 3, pages 765–778, January 5, 2009

Additional Information

How to Cite

Zhang, Q., Liu, S., Li, Z., Li, J., Chen, Z., Wang, R., Lu, L. and Deng, Y. (2009), Novel Cyclic Sulfonium-Based Ionic Liquids: Synthesis, Characterization, and Physicochemical Properties. Chem. Eur. J., 15: 765–778. doi: 10.1002/chem.200800610

Author Information

  1. 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. 2

    Graduate School of the Chinese Academy of Sciences, Beijing, 100039, PRC (China)

  3. 3

    School of Information Science and Engineering and The National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, 73000 (China)

Publication History

  1. Issue published online: 29 DEC 2008
  2. Article first published online: 28 NOV 2008
  3. Manuscript Revised: 14 AUG 2008
  4. Manuscript Received: 2 APR 2008

Funded by

  • National Natural Science Foundation of China. Grant Numbers: 20533080, 20225309, 50421502

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Keywords:

  • electrochemistry;
  • ionic liquids;
  • performance;
  • physicochemical properties;
  • sulfonium ions

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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