Related Experiment Video
Updated: May 2, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Determination of halide impurities in ionic liquids by total reflection X-ray fluorescence spectrometry
Tom Vander Hoogerstraete1, Steven Jamar, Sil Wellens
1Department of Chemistry, KU Leuven , Celestijnenlaan 200F, P.O. Box 2404, Heverlee, B-3001, Belgium.
Abstract:
The determination and quantification of halide impurities in ionic liquids is highly important because halide ions can significantly influence the chemical and physical properties of ionic liquids. The use of impure ionic liquids in fundamental studies on solvent extraction or catalytic reactions can lead to incorrect experimental data. The detection of halide ions in solution by total reflection X-ray fluorescence (TXRF) has been problematic because volatile hydrogen halide (HX) compounds are formed when the sample is mixed with the acidic metal standard solution. The loss of HX during the drying step of the sample preparation procedure gives imprecise and inaccurate results. A new method based on an alkaline copper standard Cu(NH3)4(NO3)2 is presented for the determination of chloride, bromide, and iodide impurities in ionic liquids. The 1-butyl-3-methylimidazolium ([C4mim]) ionic liquids with the anions acetate ([C4mim][OAc]), nitrate ([C4mim][NO3]), trifluoromethanesulfonate ([C4mim][OTf]), and bis(trifluoromethylsulfonyl)imide ([C4mim][Tf2N]) were synthesized via a halide-free route and contaminated on purpose with known amounts of [C4mim]Cl, [C4mim]Br, [C4mim]I, or potassium halide salts in order to validate the new method and standard.
More Related Videos
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
08:50Total Internal Reflection Absorption Spectroscopy TIRAS for the Detection of Solvated Electrons at a Plasma-liquid Interface
Published on: January 24, 2018
Related Concept Videos
Precipitation of Ions
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Determination of Crystal Structures
Qualitative Analysis
For instance, group IV...
Total Internal Reflection Fluorescence Microscopy
Mass Spectrometry: Alkyl Halide Fragmentation
Precipitation Titration Curve: Analysis