The Solubility Parameters of Ionic Liquids

Abstract

The Hildebrand’s solubility parameters have been calculated for 18 ionic liquids from the inverse gas chromatography measurements of the activity coefficients at infinite dilution. Retention data were used for the calculation. The solubility parameters are helpful for the prediction of the solubility in the binary solvent mixtures. From the solubility parameters, the standard enthalpies of vaporization of ionic liquids were estimated.

Room temperature ionic liquids as emerging solvents for the pretreatment of lignocellulosic biomass

“…Empirical relationships have been developed that provide correlations between the solvation properties of solvents and specific measurable parameters that allow quantitative analysis of RTILs in terms of their critical molecular solvation properties. The most widely applied approach uses the linear solvation energy relationships (LSER) developed by Acree and Abraham (2006), Kamlet-Taft (Crowhurst et al, 2006;Fukaya et al, 2006), and Hildebrand (Marciniak, 2010;Swiderski et al, 2004), and further refined by Hansen to include more complex interactions between solute and solvent (Hansen, 2007). These LSERs provide correlations between a given solubility property, such as solvatochromic shifts or partition coefficients, with several additive terms that represent specific solubility interactions.…”

Imidazolium salts with varying anions as charge carriers for detection of neutral bis(triphenylphosphine)palladium(II) dichloride in electrospray ionization mass spectrometry

“…While not all the ILs studied here have this data readily available, there has been quite a bit of work done on the thiocyanate ([SCN] – ) anion. Both the Hildebrand solubility parameter (δ 2 ) and enthalpy of vaporization (Δ vap H) for ILs with the [SCN] – anion are higher than the other anions studied here . While the length of the alkyl chain of the cation increases the decrease in the solubility parameter, the thiocyanate anions are the least influenced by alkyl chain length .…”

“…Both the Hildebrand solubility parameter (δ 2 ) and enthalpy of vaporization (Δ vap H) for ILs with the [SCN]anion are higher than the other anions studied here. [35] While the length of the alkyl chain of the cation increases the decrease in the solubility parameter, the thiocyanate anions are the least influenced by alkyl chain length. [35] The aliphatic nature of ILs can have an effect on their solubility, causing less aliphatic compounds to have an increased solubility parameter.…”

Ionic Liquids in Space Technology – Current and Future Trends

“…ILs possess several characteristics that make them particularly suited to space technology applications. One of the key advantages is their negligibly low vapor pressures , which enables ionic liquids to be used in low pressure or vacuum environments, such as those experienced on Mars, the Moon, and in outer space, without loss via evaporation. Such potential applications will be discussed later in this paper.…”