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Related Experiment Videos

Decolorization of ionic liquids for spectroscopy.

Martyn J Earle1, Charles M Gordon, Natalia V Plechkova

  • 1QUILL, The Queen's University of Belfast, Stranmillis Road, Belfast, BT9 5AG, Northern Ireland, UK.

Analytical Chemistry
|January 16, 2007
PubMed
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Colored impurities in ionic liquids are a persistent problem, even at trace levels. This study presents a practical, albeit not "green," method to purify ionic liquids for accurate spectrochemical analysis.

Area of Science:

  • Chemistry
  • Materials Science

Background:

  • Ionic liquids are expected to be colorless, but often exhibit color.
  • This color is attributed to trace impurities (parts per billion) with high molar extinction coefficients.
  • Standard analytical techniques cannot readily identify these color-causing impurities.

Purpose of the Study:

  • To develop a practical method for removing color-causing impurities from ionic liquids.
  • To enable accurate spectrochemical applications of ionic liquids.

Main Methods:

  • A non-"green" purification method was developed and applied.
  • The method focuses on removing impurities responsible for color.

Main Results:

  • The described method effectively removes color from ionic liquids.

Related Experiment Videos

  • Purified ionic liquids are suitable for spectrochemical studies.

    • Conclusions:

    • A practical purification technique for colored ionic liquids is presented.
    • This method is suitable for small-scale academic research, not industrial processes.