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- Sulfonic Acid Functionalized Ionic Liquids
The core of synthesizing sulfonic acid functionalized ionic liquid is to introduce -SO3H group on the cationic group. The most prominent advantage is that it has Broňsted acidity. This feature makes it applicable to the synthesis of a variety of compounds or materials. The cations mainly include: 1-sulfonic acid propyl-3-methylimidazole, 1-sulfonic acid butyl-3-methylimidazole, 1-sulfonic acid propylpyridine and 1-sulfonic acid butylpyridine. Anions mainly include: chlorine, hydrogen sulfate, trifluoroacetic acid and trifluoromethanesulfonic acid.
Figure 1. Common structure of sulfonic acid functionalized ionic liquids
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