Estimates of internal energies of vaporisation of some room temperature ionic liquids

Swiderski, Konrad; McLean, Andrew J.; Gordon, Christopher P.; Vaughan, D. H.

doi:10.1039/b408334b

Cited by 123 publications

(116 citation statements)

References 8 publications

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“…An interesting class of ionic liquids for optical applications are the bis(trifluoromethanesulfonyl)imides, because they show a low melting point, low viscosity and a good transparency in the ultraviolet region, due to the absence of a charge transfer band that limits the ultraviolet transparency of the halide ionic liquids. The preparation of ÔspectrogradeÕ imidazolium hexafluorophosphate ionic liquids by methanthesis was already demonstrated [22,27] [Br] colorless were added to this sample to check if the absorption bands could be attributed to some halide residues. The absorption spectrum is also shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Purification of imidazolium ionic liquids for spectroscopic applications

Nockemann

Binnemans

Driesen

2005

Chemical Physics Letters

246

170

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Ionic liquids are often contaminated by colored impurities. These impurities can be problematic for spectroscopic studies or for monitoring organic reactions by UV/Vis spectroscopy. The effect of different purification methods on the optical quality of colored ionic liquids was studied and compared. Yellowish ionic liquids can partially be decolorized by treatment with active charcoal or by recrystallization. Our experiments show column liquid chromatography is not always a good technique to prepare spectrograde imidazolium halide ionic liquids. Colorless and UV-transparent ionic liquids were synthesized by a method that can exclude the need for further purification steps.

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Section: Resultsmentioning

confidence: 99%

Purification of imidazolium ionic liquids for spectroscopic applications

Nockemann

Binnemans

Driesen

2005

Chemical Physics Letters

246

170

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“…[47,48] The higher cohesive energy densities observed for [C 1 mim]Cl are a result of the stronger Lewis basicity/ hydrogen bonding potential of the anion, and its simplicity which allows for a more facile "packing" of ions in the liquid.…”

Section: à3mentioning

confidence: 99%

Application of Static Charge Transfer within an Ionic‐Liquid Force Field and Its Effect on Structure and Dynamics

2008

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The effects of linear scaling of the atomic charges of a reference potential on the structure, dynamics, and energetics of the ionic liquid 1,3-dimethylimidazolium chloride are investigated. Diffusion coefficients that span over four orders of magnitude are observed between the original model and a scaled model in which the ionic charges are +/-0.5 e. While the three-dimensional structure of the liquid is less affected, the partial radial distribution functions change markedly--with the positive result that for ionic charges of +/-0.7 e, an excellent agreement is observed with ab initio molecular dynamics data. Cohesive energy densities calculated from these partial-charge models are also in better agreement with those calculated from the ab initio data. We postulate that ionic-liquid models in which the ionic charges are assumed to be +/-1 e overestimate the intermolecular attractions between ions, which results in overstructuring, slow dynamics, and increased cohesive energy densities. The use of scaled-charge sets may be of benefit in the simulation of these systems--especially when looking at properties beyond liquid structure--thus providing an alternative to computationally expensive polarisable force fields.

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“…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.…”

Section: Solvation Properties Of Rtilsmentioning

confidence: 99%

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

Mora-Pale

Meli

Doherty

et al. 2011

Biotech & Bioengineering

364

225

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Room temperature ionic liquids (RTILs) are emerging as attractive and green solvents for lignocellulosic biomass pretreatment. The unique solvating properties of RTILs foster the disruption of the 3D network structure of lignin, cellulose, and hemicellulose, which allows high yields of fermentable sugars to be produced in subsequent enzymatic hydrolysis. In the current review, we summarize the physicochemical properties of RTILs that make them effective solvents for lignocellulose pretreatment including mechanisms of interaction between lignocellulosic biomass subcomponents and RTILs. We also highlight several recent strategies that exploit RTILs and generate high yields of fermentable sugars suitable for downstream biofuel production, and address new opportunities for use of lignocellulosic components, including lignin. Finally, we address some of the challenges that remain before large-scale use of RTILs may be achieved.

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Estimates of internal energies of vaporisation of some room temperature ionic liquids

Abstract: Systematic variation in the bimolecular rate constant, k(q), for the reaction of singlet oxygen and 1,4-dimethylnaphthalene has led to estimates of the Hildebrand solubility parameter, cohesive pressures and internal energies of vaporisation of some room temperature ionic liquids.

Cited by 123 publications

References 8 publications

Purification of imidazolium ionic liquids for spectroscopic applications

Purification of imidazolium ionic liquids for spectroscopic applications

Application of Static Charge Transfer within an Ionic‐Liquid Force Field and Its Effect on Structure and Dynamics

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

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