Conductivity and association of imidazolium and pyridinium based ionic liquids in methanol

Voroshylova, Iuliia V.; Smaga, Sergei R.; Lukinova, E.V.; Chaban, Vitaly V.; Kalugin, Oleg N.

doi:10.1016/j.molliq.2014.12.028

Cited by 34 publications

(13 citation statements)

References 45 publications

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“…In the case of solvent-separated (SSIP) ion pairs, the K A and Λ o values are higher. The data collected in Table 3 also show that the association constants increase with increasing temperature, and the effect is much more pronounced in the case of 4 ] solutions in dimethyl sulfoxide [9] and N,N-dimethylformamide [6], the association constants are practically negligible; in methanol and acetonitrile [7][8][9][10], ion association is rather weak. In turn, in water [4], both ionic liquids are practically fully dissociated, whereas in 1-propanol [5] and especially in dichloromethane, they were definitely associated.…”

Section: Resultsmentioning

confidence: 85%

“…A survey of literature indicates that most studies report only the specific conductivity data for pure ionic liquids or binary and ternary mixtures of ILs with various solvents at 298.15 K. The conductance studies of dilute solutions of ionic liquids in a wide temperature range allow the determination of the values of association constants and thermodynamic functions of association, which consequently allows the better understanding of the behavior of ILs in various solvents [1][2][3]. This paper is both a continuation and an extension of our and other authors' works on association of imidazolium-based ionic liquids, i.e., [ 4 ] in water [4], 1-propanol [5], N,N-dimethylformamide [6], acetonitrile [7,8], dimethylsulfoxide [9], and methanol [9,10]. Moderate ionic association of ILs occurs in N,N-dimethylformamide, acetonitrile, and methanol, slight in dimethylsulfoxide, whereas it becomes significant in 1-propanol.…”

Section: Introductionmentioning

confidence: 93%

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Ionic association and conductance of ionic liquids in dichloromethane at temperatures from 278.15 to 303.15 K

Boruń

Bald

2016

Ionics

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The electrical conductances of very dilute solutions of the ionic liquids 1-ethyl-3-methylimidazolium tetrafluoroborate [emim] [BF 4 ] and 1-butyl-3-methylimidazolium tetrafluoroborate [bmim] [BF 4 ] in the low-permittivity solvent dichloromethane have been measured in the temperature range from 278.15 to 303.15 K at 5 K intervals. The data was analyzed assuming the possible presence of contact (CIP) and solvent-separated (SSIP) ion pairs in the solution on the basis of lcCM model to obtain ionic association constants, K A , and the limiting molar conductivities, Λ o , of these electrolytes. The examined ionic liquids are strongly associated in dichloromethane over the whole temperature range. From the temperature dependence of the limiting molar conductivities, the Eyring's activation enthalpy of charge transport was determined. The thermodynamic functions such as Gibbs energy, entropy, and enthalpy of the process of ion pair formation were calculated from the temperature dependence of the association constants.

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Section: Resultsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 93%

Ionic association and conductance of ionic liquids in dichloromethane at temperatures from 278.15 to 303.15 K

Boruń

Bald

2016

Ionics

View full text Add to dashboard Cite

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“…[75,83] These values indicate that the examined ILs are strongly associated in these solvents. The ion association is moderate in MeOH, [75,83,84] and slight in ACN, [77,79,80] DMAc [88] and in DMF. [85] Weak ion association is present in DMSO, [86] and in W solvent.…”

Section: Some Recent Conductometric Volumetric and Viscometric Results For Imidazolium-based Ionic Liquids In Various Solventsmentioning

confidence: 91%

Imidazolium-Based Ionic Liquids: Some Research Methods, Applications and Physico-Chemical Properties

Tomaš

2021

Croat. Chem. Acta

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Imidazolium-based ionic liquids (ILs) represent a well-studied class of ILs. These compounds are characterized by many fascinating properties such as non-flammability, low vapor pressure, wide electrochemical window, and thermodynamic and kinetic stability. This review paper aims to provide an insight into some experimental methods of investigations and applications of these ILs. Additionally, some results on the topic of imidazolium-based ILs in various solvents are presented.

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“…15 Recently, it has been demonstrated that ILs can serve as an excellent model system for investigating the influence of the ion structure on the mobility and ion pairing even in aqueous solutions, where the interionic interac-tions are weak. 6,16,17 It turned out that due to possible variations in the structure of chain length and counter-ions the surface active ionic liquids (SAILs) have a great potential for investigation of micellization process in aqueous solutions. 8,18,19 Even more, SAILs were used in investigations of aggregation behavior in non-aqueous solvents where solvophobic effect and the hydrogen-bonding interactions were found as the main factors controlling the aggregates formation.…”

Section: Ionic Liquids In Solutionsmentioning

confidence: 99%

Ionic Liquids: Simple or Complex Electrolytes?

Bešter‐Rogač

2020

ACSi

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Ionic liquids belong to the most investigated systems in the recent years and this field is still significantly growing with an increased focus on developing ionic liquids for specific applications, along with fundamental research. In the present featured paper the similarity and differences between common, "classical" electrolytes and common surfactants and ionic liquids along with the surface-active ionic liquids are discussed in order to stress their significance and point out on their weak points. A short survey of the literature data reveals namely that ionic liquids in solutions behave like "classical" electrolytes and can be described by existing models in the range of their validity. There is still a lack of models describing well the concentrated electrolyte solutions and here ionic liquids, less limited by solubility as common electrolytes, can serve as model systems. The micellization of surface-active ionic liquids in aqueous solutions can be described in the same way as for common surfactants, but surface-active ionic liquids offer more possibilities to study specific ion and isomer effects. They are also quite promising systems to study the aggregation processes in non-aqueous solutions.

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Conductivity and association of imidazolium and pyridinium based ionic liquids in methanol

Cited by 34 publications

References 45 publications

Ionic association and conductance of ionic liquids in dichloromethane at temperatures from 278.15 to 303.15 K

Ionic association and conductance of ionic liquids in dichloromethane at temperatures from 278.15 to 303.15 K

Imidazolium-Based Ionic Liquids: Some Research Methods, Applications and Physico-Chemical Properties

Ionic Liquids: Simple or Complex Electrolytes?

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