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Liquids that consist of a mixture of an alcohol and either an amidine or a guanidine have been developed to switch from a low-polarity form to a high-polarity ionic liquid upon treatment with CO 2 at atmospheric pressure. Treatment with N 2 and/or mild heat (50−60 °C) reverses the process. These liquids can be used as switchable solvents to dissolve and then precipitate a solute or to dissolve reagents for a chemical synthesis and then precipitate the product.
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Phan et al. (2007) studied this question.
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