Special Mixing Behavior of Chelate‐based Ionic Liquid with Methanol

Abstract

Compared to the general ionic liquids (ILs), a significant deviation of the binary mixtures of 1-decyl-3-methylimidazolium tri(hexafluoroacetylaceto)-copper(II) ([C 10 mim][Cu(hfacac) 3 ]) with methanol was found, indicating the way methanol interacts with ILs might be governed by the special structure of the chelating anion. IR results showed that the v(C2-H) of 1-decyl-3-methylimidazolium hexafluoroacetylacetonate ([C 10 mim][hfacac]) blue-shifted more significantly than that of [C 10 mim][Cu(hfacac) 3 ], meanwhile the v(C=O) red-shifted in [C 10 mim][Cu(hfacac) 3 ], which is contrast with that in [C 10 mim][hfacac]. Two-dimensional correlation analysis of the FTIR spectra indicated that the chelating cavity has little effect on the sequence of the ILs sites that interact with methanol. Combined with small angle X-ray scattering (SAXS) results, the picture of mixing processes in these two systems were proposed. Methanol interacts directly with the anion followed by the cation in [C 10 mim][hfacac], while methanol preferentially enters the chelating cavity and enhances the packing effect in the [C 10 mim][Cu(hfacac) 3 ] system.

Intensification of Amino Acid Ionic Liquids with Different Additives for CO2 Capture

“…To improve the absorption behavior of AAILs, one feasible approach is to add some functional components. Thus far, specific binary systems have been reported by combing AAILs with several representative solvents, including H 2 O, alcohols, − and amines, such as dimethyl ethanolamine (DMEA) and monoethanolamine (MEA) (Table ). Generally, the absorption of CO 2 in AAILs can be enhanced with the addition of water, organic amine, or EG.…”