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Related Experiment Video

Updated: May 30, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

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Understanding the polarity of ionic liquids.

M A Ab Rani¹, A Brant, L Crowhurst

¹Department of Chemistry, Imperial College London, London, UK.

Physical Chemistry Chemical Physics : PCCP

|August 23, 2011

Summary

This study quantifies ionic liquid polarities using Kamlet-Taft scales and various dyes. Results highlight how solute type, especially charged vs. neutral probes, impacts polarity measurements and the influence of impurities.

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Area of Science:

Physical Chemistry
Materials Science
Analytical Chemistry

Background:

Ionic liquids (ILs) are versatile solvents with tunable properties.
Accurate polarity determination is crucial for understanding and utilizing ILs.
Existing polarity scales may not fully capture the unique characteristics of ILs.

Purpose of the Study:

To determine the polarities of various ionic liquids using established empirical scales.
To compare polarity measurements obtained with different dye sets and scales.
To investigate the influence of solute nature (charged vs. neutral probes) and impurities on IL polarity.

Main Methods:

Utilized the Kamlet-Taft empirical polarity scales (α, β, π*) for quantification.
Employed a dye set including Reichardt's Dye, N,N-diethyl-4-nitroaniline, and 4-nitroaniline.
Compared results with different dye sets and polarity scales, and analyzed impurity effects.

Main Results:

Polarity values for a range of ionic liquids were successfully determined.
Significant differences in measured polarity were observed when using charged versus neutral probes.
Common impurities were found to affect the measured polarity of ionic liquids.

Conclusions:

The choice of solute (dye probe) is critical for accurate ionic liquid polarity assessment.
Polarity scales based on charged solutes yield different results compared to neutral probes for ionic liquids.
Understanding the impact of impurities is essential for reliable ionic liquid characterization.