2. Classification of ionic liquids
Ionic liquids are classified according to the following characteristics:
protic or aprotic character;
sensitivity to water and oxygen;
the special characteristics of anions ;
toxicity and potential impact on the environment.
2.1 Protic/aprotic character
An ionic liquid is protic if it results from the transfer of a proton from an acid to a base in the Bronsted sense, and if the proportion of non-ionized salt in the liquid state is less than 1%.
The ethylammonium nitrate discovered by Walden and quoted above belongs to this class of ionic liquid. Curiously, it was the aprotic ionic liquids that were first developed, and it was only later, in the quest...
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Classification of ionic liquids
Physico-chemical properties
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