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Tunable LCST-type phase behavior of [FeCl4]--based ionic liquids in water

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  • SPECIAL TOPIC · Ionic Liquids: Energy, Materials & Environment
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Abstract

In this work, 16 kinds of [FeCl4]--based magnetic ionic liquids (ILs) with different cation structures have been designed and synthesized, and their structures are characterized by IR and Raman spectroscopy. Then the lower critical solution temperature (LCST)-type phase behavior of these magnetic ILs in water is investigated as a function of concentration. It is shown that cation structure, alkyl chain length and molar ratio of FeCl3/chloride IL have a significant influence on the LCST of the mixtures. The phase separation temperature can be tuned efficiently by these factors. Meanwhile, the LCST-type phase separation process is also investigated by dynamic light scattering. The results support the mechanism that the hydrogen bonds of the [FeCl4]- anion with water have been gradually disrupted to form ILs aggregates with increasing temperature. In addition, the stability of the ILs in water is also examined in some details. These LCST-type phase separation systems may have potential applications in extraction and separation techniques at room temperature.

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Authors and Affiliations

  1. Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Normal University, Xinxiang, 453007, China

    Yuanchao Pei, Yuan Cao, Yanjie Huang, Xinxin Song, Huiyong Wang, Yuling Zhao & Jianji Wang

  2. Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, 453007, China

    Yuanchao Pei, Yuan Cao, Yanjie Huang, Xinxin Song, Huiyong Wang, Yuling Zhao & Jianji Wang

  3. School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, China

    Yuanchao Pei, Yuan Cao, Yanjie Huang, Xinxin Song, Huiyong Wang, Yuling Zhao & Jianji Wang

Authors
  1. Yuanchao Pei
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  2. Yuan Cao
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  3. Yanjie Huang
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  4. Xinxin Song
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  5. Huiyong Wang
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  6. Yuling Zhao
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  7. Jianji Wang
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Correspondence to Jianji Wang.

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Pei, Y., Cao, Y., Huang, Y. et al. Tunable LCST-type phase behavior of [FeCl4]--based ionic liquids in water. Sci. China Chem. 59, 587–593 (2016). https://doi.org/10.1007/s11426-016-5577-0

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  • DOI: https://doi.org/10.1007/s11426-016-5577-0

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