Water-induced Acceleration of Transport Properties in Hydrophobic 1-Butyl-3-methylimidazolium Hexafluorophosphate Ionic Liquid

Kanakubo, Mitsuhiro; Umecky, Tatsuya; Aizawa, Takafumi; Kurata, Yoshiaki

doi:10.1246/cl.2005.324

Cited by 40 publications

(41 citation statements)

References 12 publications

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“…It has been shown [14,15] that small amounts of water in fluorinated ILs, such as 1-butyl-3-methylimidazolium hexafluorophosphate and tetrafluoroborate, have a dramatic effect on the rate of diffusion of neutral and ionic species in these media. It was thus proposed that "wet" ILs may not be regarded as homogeneous solvents but have hydrogen-bond interactions that can possess in some cases polar and non-polar regions [16].…”

Section: Introductionmentioning

confidence: 99%

Room temperature ionic liquids as lubricant additives in steel–aluminium contacts: Influence of sliding velocity, normal load and temperature

Jiménez

Bermúdez

Carrión

et al. 2006

Wear

228

161

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Section: Introductionmentioning

confidence: 99%

Room temperature ionic liquids as lubricant additives in steel–aluminium contacts: Influence of sliding velocity, normal load and temperature

Jiménez

Bermúdez

Carrión

et al. 2006

Wear

228

161

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“…The role of water in ionic liquids is complex and depends on the supramolecular structures of ionic liquids. [15][16][17] Measurements of the solvation responses and microscopic solvent properties have resulted in the accumulation of a sizable database on solvation dynamics in ionic liquids. [15][16][17] Measurements of the solvation responses and microscopic solvent properties have resulted in the accumulation of a sizable database on solvation dynamics in ionic liquids.…”

Section: Effects Of Water and Methanol On The Molecular Organization mentioning

confidence: 99%

Effects of water and methanol on the molecular organization of 1-butyl-3-methylimidazolium tetrafluoroborate as functions of pressure and concentration

Chang

Jiang

Liou

et al. 2008

The Journal of Chemical Physics

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The structural organization in mixtures of 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF(4)])/water or methanol was studied by infrared spectroscopy. No drastic change in the concentration dependence of the alkyl C-H band frequency was observed at high concentration of the ionic liquid. This behavior indicates a clustering of the ionic liquid in alkyl regions. Nevertheless, the presence of methanol significantly perturbs the ionic liquid-ionic liquid associations in the imidazolium region. On the basis of the responses to change in pressure and concentration, two different types of O-H species, i.e., free O-H and bonded O-H, were observed in the O-H stretching region. For [bmim][BF(4)]/water mixtures, the compression leads to loss of the free O-H band intensity. It is likely that free O-H is switched to bonded O-H as high pressures are applied. For [bmim][BF(4)]/methanol mixtures, the free O-H is still stable under high pressures.

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“…The dissociation of ILs also have a profound impact on toxicity, 11 their use in chemical reactions, 12 and applications as an active pharmaceutical ingredient (API). 13−15 Many experimental efforts (e.g., using NMR, 16,17 dielectric relaxation spectroscopy (DRS), 18,19 and conductivity measurements 20 ) have been devoted to investigating the extent of dissociation (α) of ILs. In the dilute solution limit, ILs tend to fully dissociate.…”

Section: Introductionmentioning

confidence: 99%

A Priori Prediction of Dissociation Phenomena and Phase Behaviors of Ionic Liquids

Lee

Lin

2015

Ind. Eng. Chem. Res.

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Many unique properties of ionic liquids (ILs) are closely related to the extent of dissociation (α) in solution. However, most of the existing models for ILs assume either full dissociation or full nondissociation regardless of mixture compositions. In this work, the dissociation of ILs (CA = C + + A − ) is described as a chemical reaction. Together with the predictive COSMO-SAC model, the dissociation constant can be determined based on the value of α in the pure state. Our results show that the predicted composition dependence of α is in good agreement with experiment over the entire concentration range. We further examine the prediction of a variety of thermodynamic properties and phase behaviors of IL solutions, covering high (infinite dilution activity coefficient of solvent), medium (vapor−liquid and liquid−liquid), and low (osmotic coefficient and mean ionic activity coefficient) IL concentrations (a total of 9857 data points). Our results show that the composition dependence of IL dissociation has a significant impact on the phase behaviors of IL solutions. The dominating factors for the solution nonideality changes from short-range ion-pair interactions at high IL concentrations to long-range ion−ion interactions at low IL concentrations.

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Water-induced Acceleration of Transport Properties in Hydrophobic 1-Butyl-3-methylimidazolium Hexafluorophosphate Ionic Liquid

Cited by 40 publications

References 12 publications

Room temperature ionic liquids as lubricant additives in steel–aluminium contacts: Influence of sliding velocity, normal load and temperature

Room temperature ionic liquids as lubricant additives in steel–aluminium contacts: Influence of sliding velocity, normal load and temperature

Effects of water and methanol on the molecular organization of 1-butyl-3-methylimidazolium tetrafluoroborate as functions of pressure and concentration

A Priori Prediction of Dissociation Phenomena and Phase Behaviors of Ionic Liquids

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