Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 19, Issue 39, Pages 26934-26943Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp05710e
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Funding
- Novartis-Massachusetts Institute of Technology (MIT) Center for Continuous Manufacturing (CCM)
- Novartis International AG
- Canada Excellence Research Chairs Program
- FAPESP (Sao Paulo Research Foundation Brazil) [2014/16424-7]
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The properties of double salt ionic liquids based on solutions of cholinium acetate ([Ch][OAc]), ethanolammonium acetate ([NH3(CH2)(2)OH][OAc]), hydroxylammonium acetate ([NH3OH][OAc]), ethylammonium acetate ([NH3CH2CH3][OAc]), and tetramethylammonium acetate ([N(CH3)(4)][OAc]) in 1-ethyl3- methylimidazolium acetate ([C(2)mim][OAc]) were investigated by NMR spectroscopy and X-ray crystallography. Through mixture preparation, the solubility of [N(CH3)(4)][OAc] is the lowest, and [Ch][OAc] shows a 3-fold lower solubility than the other hydroxylated ammonium acetate-based salts in [C(2)mim][OAc] at room temperature. NMR and X-ray crystallographic studies of the pure salts suggest that the molecular-level mechanisms governing such miscibility differences are related to the weaker interactions between the -NH3 groups and [OAc](-), even though three of these salts possess the same strong 1 : 1 hydrogen bonds between the cation -OH group and the [OAc](-) ion. The formation of polyionic clusters between the anion and those cations with unsatisfied hydrogen bond donors seems to be a new tool by which the solubility of these salts in [C(2)mim][OAc] can be controlled.
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