ICMS Determination of Anionic Ionic Liquids, Counterions, and Impurities ICMS Determination of Anionic Ionic Liquids, Counterions, and Impurities (original) (raw)

Advances in analytical chemistry using the unique properties of ionic liquids

TrAC Trends in Analytical Chemistry, 2012

Ionic liquids (ILs) are regarded as non-molecular solvents, as they are composed entirely of cations and anions. ILs possess several excellent unique properties (e.g., low volatility, high thermal stability, specific electrochemical characteristics, easy design, tunable viscosity, and miscibility with water or organic solvents). These properties make ILs attractive candidates for various analytical applications, the number of publications on which has increased exponentially in the past decade. This article presents an overview of representative applications of ILs in advances in analytical chemistry that benefited from the unique properties of ILs, including the development achieved by using ILs as extraction solvents, dissolution solvents and separation media.

Advances of Ionic Liquids in Analytical Chemistry

Analytical chemistry, 2018

Ionic liquids and polymeric ionic liquids in solid-phase extraction 16 Ionic liquids and polymeric ionic liquids in solid-phase microextraction Liquid-phase (micro)extraction 18 Ionic liquids and magnetic ionic liquids in dispersive liquid-liquid 19 microextraction 20 Ionic liquid dispersive liquid-liquid microextraction 21 Magnetic ionic liquid dispersive liquid-liquid microextraction 22 Ionic liquids and magnetic ionic liquids in single-drop microextraction 23 Ionic liquids in hollow fiber liquid-phase microextraction 24 Two phase ionic liquid-hollow fiber liquid-phase microextraction 25 Three phase ionic liquid-hollow fiber liquid-phase microextraction 26 Ionic liquids and magnetic ionic liquids in aqueous biphasic systems 27 Chromatographic and electrophoretic separations 28 Gas chromatography 29 Monocationic ionic liquid-based stationary phases 30 Di-and polycationic ionic liquid-based stationary phases 31 Polymeric ionic liquid-based stationary phases 32 Metal-containing ionic liquid-based stationary phases 33 Commercial ionic liquid-based stationary phases 34

Ionic liquids in analytical chemistry

Analytical chemistry, 2006

Room temperature ionic liquids (RTILs) are salts with melting points close or below room temperature. They form liquids in which ions are present. This fact produces interesting solvent properties. RTIL are able to dissolve some apolar molecules as well as some very polar ones. They start to find original use in chemical analysis. Since some RTILs are not soluble in water, they can be used in water/RTIL extractions. The distribution coefficients of a variety of solutes were measured. Our results are presented and discussed along with the results of others. RTILs were also used as electrolytes in capillary electrophoresis. Their low volatility makes them useful as solvent working in high vacuum (MALDI matrixes) or high temperature (GC stationary phases). Examples of such uses were developed and are also discussed.

Uses of ionic liquids in analytical chemistry

2004

Novel Electrochemical Studies of Ionic Liquids

Langmuir, 2002

Room-temperature ionic liquids (ILs) have been proposed as alternative solvents for organic synthesis, separations, and electrochemical applications. Here, we report studies that probe the electrochemical and solvation properties of a tetraalkylammonium (methyltributylammonium bis(trifluoromethylsulfon)imide, M3BNIm) and an imidazolium (1-butyl-3-methylimidazolium hexafluorophosphate, BMIPF6) based ionic liquid. It is demonstrated that despite impurities, the cathodic limit at a Pt electrode is enhanced for the tetraalkylammonium-based IL. Electrogenerated chemiluminescence of tris(2,2′-bipyrindinyl)ruthenium (Ru(bpy)3 2+) was observed in both ionic liquids, and differences in the response were interpreted in terms of the solvent reactivity and polarity. As ILs have been proposed as alternatives to organic solvents in extraction processes, an understanding of the relative lipophilicity of the IL ions and the equilibrium potential difference established across the IL/water interface is of fundamental relevance. Here, electrochemical measurements at a conventionally polarized liquid-liquid interface (water/1,2-dichloroethane) were used to determine the relative lipophilicity of the IL constituent ions. From formal ion transfer potential values (∆ o w φ i 0) obtained, the standard ionic partition coefficients could be estimated. The polarizability of the neat ionic liquid/water interface was investigated. From these studies, it can be seen that BMIPF6 is hydrophilic while M3BNIm is moderately hydrophobic. The significance of the potential difference established across the IL/water interface is discussed.

A new class of solvents for CCC: the room temperature ionic liquids

2003

Room temperature ionic liquids (RTILs) are salts with melting point close or below room temperature. Changing the nature of the anion or the cation produces a new salt that may or may not be a RTIL. The physico chemical properties of RTILs are briefly reviewed. The partitioning of 38 aromatic derivatives with acid, base, or neutral functionalities was studied between the biphasic liquid system 1-butyl-3-methyl imidazolium hexafluorophosphate (BMIM PF 6) and water. It was found that the viscosity of pure RTILs is too high for direct use as a liquid phase in countercurrent chromatography (CCC). The addition of a third solvent was needed to decrease viscosity. The ternary phase diagrams of BMIM PF 6-water and acetonitrile, methanol, ethanol, 1-propanol, and 2-propanol are presented

ICMS Determination of Anionic Ionic Liquids, Counterions, and Impurities ICMS Determination of Anionic Ionic Liquids, Counterions, and Impurities (original) (raw)

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