Purification of imidazolium ionic liquids for spectroscopic applications

Peter Nockemann, K. Binnemans, K. Driesen

Research output: Contribution to journalArticlepeer-review

219 Citations (Scopus)


Ionic liquids are often contaminated by colored impurities. These impurities can be problematic for spectroscopic studies or for monitoring organic reactions by UV/Vis spectroscopy. The effect of different purification methods on the optical quality of colored ionic liquids was studied and compared. Yellowish ionic liquids can partially be decolorized by treatment with active charcoal or by recrystallization. Our experiments show column liquid chromatography is not always a good technique to prepare spectrograde imidazolium halide ionic liquids. Colorless and UV-transparent ionic liquids were synthesized by a method that can exclude the need for further purification steps. (c) 2005 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)131-136
Number of pages6
JournalChemical Physics Letters
Issue number1-3
Publication statusPublished - 24 Oct 2005

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces


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