Abstract
The liquid–liquid phase diagrams of 1-hexyl-3-methylimidazolium bis(trifluoromethyl)sulfonyl imide with regular and deuterated 1-alkanols (CnH2n+1OH and CnH2n+1OD, n=4–10) have been obtained. Deuteration of alcohols in the hydroxyl groups changes the upper critical solution temperatures in a very surprising way. The immiscibility region of the systems upon deuterium substitution in alcohol initially decreases (n=4, 5), then significantly enlarges (n=7), and finally practically does not change (n=8–10) in comparison with the systems with nondeuterated alcohols. This is the first time when non-monotonic change of the isotope effect on miscibility with the increase of the length of the alkyl chain was observed.
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