Explaining Ionic Liquid Water Solubility in Terms of Cation and Anion Hydrophobicity

Ranke, Johannes; Othman, Alaa; Ping, Fan; Müller, Anja

doi:10.3390/ijms10031271

Cited by 124 publications

(105 citation statements)

References 36 publications

(31 reference statements)

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“…Classifications of chaotropic ions as hydrophobic, occasionally found in the literature,109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119 are unfortunate because they may lead to incorrect assignments in terms of the underlying driving force for associative processes. Vice versa, hydrophobic ions do actually exist, such as BPh 4 − , (C 2 F 5 ) 3 PF 3 − , and AsPh 4 + ,80, 120, 121, 122 and it is also important not to label these as being superchaotropic47, 51, 52, 123 when sequences of ionic properties, scales for ionic solvation, or reasons for aqueous assembly processes are being developed. Superchaotropic and hydrophobic ions are neighbors on the continuum solvation scale in Figure 1 b (because they are both large and highly polarizable), but they would differ in terms of their surface charge density and dominant water‐solvation pattern (Figure 1 a).…”

Section: Thermochemical Hydration Characteristicsmentioning

confidence: 99%

The Chaotropic Effect as an Assembly Motif in Chemistry

2018

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Following up on scattered reports on interactions of conventional chaotropic ions (for example, I−, SCN−, ClO4 −) with macrocyclic host molecules, biomolecules, and hydrophobic neutral surfaces in aqueous solution, the chaotropic effect has recently emerged as a generic driving force for supramolecular assembly, orthogonal to the hydrophobic effect. The chaotropic effect becomes most effective for very large ions that extend beyond the classical Hofmeister scale and that can be referred to as superchaotropic ions (for example, borate clusters and polyoxometalates). In this Minireview, we present a continuous scale of water–solute interactions that includes the solvation of kosmotropic, chaotropic, and hydrophobic solutes, as well as the creation of void space (cavitation). Recent examples for the association of chaotropic anions to hydrophobic synthetic and biological binding sites, lipid bilayers, and surfaces are discussed.

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Section: Thermochemical Hydration Characteristicsmentioning

confidence: 99%

The Chaotropic Effect as an Assembly Motif in Chemistry

2018

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“…The sensitivity is often attributed to enhanced ion conductivity and/or concentration 32,33 . On the other hand, hydrophobic ionic liquids show minimal sensitivity to humidity, with the response decreasing with increasing hydrophobicity 34,35 . We observe the same trend in the conductance and capacitance of our liquid-state heterojunction devices (Fig.…”

Section: Article Nature Communications | Doi: 101038/ncomms6032mentioning

confidence: 99%

Highly deformable liquid-state heterojunction sensors

Ota¹,

Chen²,

Lin³

et al. 2014

Nat Commun

228

221

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Mechanically deformable devices and sensors enable conformal coverage of electronic systems on curved and soft surfaces. Sensors utilizing liquids confined in soft templates as the sensing component present the ideal platform for such applications, as liquids are inherently more deformable than solids. However, to date, liquid-based devices have been limited to metal lines based on a single-liquid component given the difficulty in the fabrication of liquidbased junctions due to intermixing. Here, we demonstrate a robust platform for the fabrication of liquid-liquid 'heterojunction' devices, presenting an important advancement towards the realization of liquid-state electronic systems. The device architecture and fabrication scheme we present are generic for different sensing liquids, enabling demonstration of sensors responsive to different stimuli. As a proof of concept, we demonstrate temperature, humidity and oxygen sensors by using different ionic liquids, exhibiting high sensitivity with excellent mechanical deformability arising from the inherent property of the liquid phase.

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“…The second case represents alcohols with larger non-polar alkyl substituents [6]. The third case represents the ionic liquids in which the combination of the anions and cations lead to an hydrophobic interaction [36,37]. Due to the simplicity of our model solute, size and hydrophobicity effects are not taken into account independently, but both are considered through the λ W parameter.…”

Section: S Imentioning

confidence: 99%

Lattice model for water-solute mixtures

Furlan

Almarza

Barbosa

2016

The Journal of Chemical Physics

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A lattice model for the study of mixtures of associating liquids is proposed. Solvent and solute are modeled by adapting the associating lattice gas (ALG) model. The nature of interaction solute/solvent is controlled by tuning the energy interactions between the patches of ALG model. We have studied three set of parameters, resulting on, hydrophilic, inert and hydrophobic interactions.Extensive Monte Carlo simulations were carried out and the behavior of pure components and the excess properties of the mixtures have been studied. The pure components: water (solvent) and solute, have quite similar phase diagrams, presenting: gas, low density liquid, and high density liquid phases. In the case of solute, the regions of coexistence are substantially reduced when compared with both the water and the standard ALG models. A numerical procedure has been developed in order to attain series of results at constant pressure from simulations of the lattice gas model in the grand canonical ensemble. The excess properties of the mixtures: volume and enthalpy as the function of the solute fraction have been studied for different interaction parameters of the model. Our model is able to reproduce qualitatively well the excess volume and enthalpy for different aqueous solutions. For the hydrophilic case, we show that the model is able to reproduce the excess volume and enthalpy of mixtures of small alcohols and amines. The inert case reproduces the behavior of large alcohols such as, propanol, butanol and pentanol. For last case (hydrophobic), the excess properties reproduce the behavior of ionic liquids in aqueous solution.a

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Explaining Ionic Liquid Water Solubility in Terms of Cation and Anion Hydrophobicity

Cited by 124 publications

References 36 publications

The Chaotropic Effect as an Assembly Motif in Chemistry

The Chaotropic Effect as an Assembly Motif in Chemistry

Highly deformable liquid-state heterojunction sensors

Lattice model for water-solute mixtures

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