Gilbert, Bernard[Université de Liège - ULg > Département de chimie (sciences) > Département de chimie (sciences) >]
Echem 2010 Conference on Molten Salts and Ionic Liquids
March 14-19, 2010
[en] ionic liquids ; impurities
[en] Since several years, our laboratory is studying the acidity in ionic liquids and showed that very acidic levels can be reached in these media when a strong acid is added. These acidity levels were determined using Hammett acidity1 (spectroscopic method) and Strehlow acidity2 (potentiometric method) measurements. Considering the attainable acidity levels, it turns out that the purity of these ionic solvents is very critical because all impurities (i.e methylimidazole, water, acetone, chloride …) can act as (strong) bases.
Therefore, it is imperative to quantify these impurities to obtain reproducible results.