Double salt ionic liquids prepared by mixing partially miscible ionic liquids: Tuning the solubility of lipophilic molecules

• Autor(a) principal: Wang, Hui
• Data de Publicação: 2014
• Outros Autores: Pereira, Jorge F.B. [UNESP], Myerson, Allan S., Rogers, Robin D.
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1149/06404.0033ecst; http://hdl.handle.net/11449/167747

Double Salt Ionic Liquids (DSILs) were prepared by mixing 1- ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2mim][NTf<inf>2</inf>]) and trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)imide ([P<inf>66614</inf>][NTf<inf>2</inf>]) in their miscible range: [C2mim]<inf>x</inf>[P<inf>66614</inf>]<inf>(1-x)</inf>[NTf<inf>2</inf>] (0 ≤ x ≤ 0.29). ¹H NMR, ¹⁹F NMR, and FT-IR spectroscopic studies indicated that the [NTf2]- anions preferentially interact with the [C<inf>2</inf>mim]⁺ cations. Solubility studies showed that solutes with long alkyl chains (e.g., heptane, methyl palmitate), which have good solubility in [P<inf>66614</inf>][NTf<inf>2</inf>] but are not totally miscible, have tunable solubility in the DSILs and the presence of even minor amounts of [C<inf>2</inf>mim]⁺ significantly decreases their solubility. However, the solubilities of benzene, toluene, 1-octanol, and poly(ethylene glycol) (PEG-300) in [C<inf>2</inf>mim]<inf>x</inf>[P<inf>66614</inf>]^(1-x)[NTf<inf>2</inf>] were controlled by their miscibility with [P66614][NTf2], and can't be tuned by changing the ion concentrations within the miscibility range.