title: Liquid-liquid equilibrium of cholinium-derived bistriflimide ionic liquids with water and octanol.
abstract: The liquid-liquid equilibria of mixtures of cholinum-based ionic liquids (N-alkyl-N,N-dimethylhydroxyethylammonium bis(trifluoromethane)sulfonylimide, [N(11n2OH)][Ntf(2)], n = 1, 2, 3, 4, and 5) plus water or 1-octanol were investigated at atmospheric pressure over the entire composition range. The experiments were conducted between 265 and 385 K using the cloud-point method. The systems exhibit phase diagrams consistent with the existence of upper critical solution temperatures. The solubility of [N(1 1 n 2OH)][Ntf(2)] in water is lower for cations with longer alkyl side chains (larger n values). The corresponding trend in the octanol mixtures is reversed. The ([N(1 1 1 2OH)][Ntf(2)] + water + octanol) ternary system shows triple liquid-liquid immiscibility at room temperature and atmospheric pressure. A combined analytic/synthetic method was used to estimate the corresponding phase diagram under those conditions. Auxiliary molecular dynamics simulation data were used to interpret the experimental results at a molecular level.
authors: Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. República, 2780-157 Oeiras, Portugal.
authors: Anabela J L
authors: AJ
authors: Costa
authors: Mário R C
authors: MR
authors: Soromenho
authors: Karina
authors: K
authors: Shimizu
authors: Isabel M
authors: IM
authors: Marrucho
authors: José M S S
authors: JM
authors: Esperança
authors: J N
authors: JN
authors: Canongia Lopes
authors: Luís Paulo N
authors: LP
authors: Rebelo