Thermophysical and Spectroscopic Studies of Pure 1-Butyl-3-methylimidazolium Tetrafluoroborate and Its Aqueous Mixtures

Chaudhary, Ganga Ram; Bansal, Shafila; Mehta, S.K.; Ahluwalia, A. S.

doi:10.1007/s10953-014-0137-8

Cited by 30 publications

(34 citation statements)

References 54 publications

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“…It is a broadening of B1 peak due to increasing of anion motion around cation upon heating. The obtained 1 H spectra are in agreement with those from [32,[34][35][36] and disagree with data from [33]. A possible source of such discrepancy is that, in the latter case, the authors used non-commercial self-synthesized samples and therefore some impurities may not be removed.…”

Section: Nmr Analysissupporting

confidence: 46%

“…15 N chemical shift measurements were made based on two-dimensional HMBC 15 N-1 H spectra. The solvent signal (DMSO-d6) was used as a reference for 1 H, 13 C spectra; BF 3 OEt 2 was used for 11 B; nitromethane was used for 15 N. The signal assignment in spectra of objects under study was performed on a base of literature data [32][33][34][35][36] and NMR-prediction instruments.…”

Section: Methodsmentioning

confidence: 99%

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The Composition of Saturated Vapor over 1-Butyl-3-methylimidazolium Tetrafluoroborate Ionic Liquid: A Multi-Technique Study of the Vaporization Process

Dunaev

Моталов

Кудин

2021

Entropy

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A multi-technique approach based on Knudsen effusion mass spectrometry, gas phase chromatography, mass spectrometry, NMR and IR spectroscopy, thermal analysis, and quantum-chemical calculations was used to study the evaporation of 1-butyl-3-methylimidazolium tetrafluoroborate (BMImBF4). The saturated vapor over BMImBF4 was shown to have a complex composition which consisted of the neutral ion pairs (NIPs) [BMIm+][BF4−], imidazole-2-ylidene C8N2H14BF3, 1-methylimidazole C4N2H6, 1-butene C4H8, hydrogen fluoride HF, and boron trifluoride BF3. The vapor composition strongly depends on the evaporation conditions, shifting from congruent evaporation in the form of NIP under Langmuir conditions (open surface) to primary evaporation in the form of decomposition products under equilibrium conditions (Knudsen cell). Decomposition into imidazole-2-ylidene and HF is preferred. The vapor composition of BMImBF4 is temperature-depended as well: the fraction ratio of [BMIm+][BF4−] NIPs to decomposition products decreased by about a factor of three in the temperature range from 450 K to 510 K.

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Section: Nmr Analysissupporting

confidence: 46%

Section: Methodsmentioning

confidence: 99%

The Composition of Saturated Vapor over 1-Butyl-3-methylimidazolium Tetrafluoroborate Ionic Liquid: A Multi-Technique Study of the Vaporization Process

Dunaev

Моталов

Кудин

2021

Entropy

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“…Figure 22. Absolute values of the empirical ratio K for molten salts, 246 organic molecular solvents, 245,246 and ILs (calculated from 25,75,79,109,118,119,136,156,168 ).…”

Section: Critical Analysis Of the Speed Of Sound In Ionic Liquids Vsmentioning

confidence: 99%

“…Isentropic compressibility of pure ILs at atmospheric pressure and at a given temperature or as a function of temperature, is request to gain a better understanding of inter-and intramolecular interactions including ions and substituent effects as well as for better and selective use in various chemical and industrial processes. [13][14][15]17,20,21,23,25,26,29,30,33,36,76,78,[80][81][82][83]85,[87][88][89][90]93,94,96,[102][103][104][107][108][109][110]115,[117][118][119][120][121]123,125,127,[129][130][131][132][133]…”

Section: Calculation Of Volumetric Properties and Thermodynamic Formamentioning

confidence: 99%

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Speed of Sound and Ultrasound Absorption in Ionic Liquids

et al. 2017

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A complete review of the literature data on the speed of sound and ultrasound absorption in pure ionic liquids (ILs) is presented. Apart of the analysis of data published to date, the significance of the speed of sound in ILs is regarded. An analysis of experimental methods described in the literature to determine the speed of sound in ILs as a function of temperature and pressure is reported, and the relevance of ultrasound absorption in acoustic investigations is discussed. Careful attention was paid to highlight possible artifacts, and side phenomena related to the absorption and relaxation present in such measurements. Then, an overview of existing data is depicted to describe the temperature and pressure dependences on the speed of sound in ILs, as well as the impact of impurities in ILs on this property. A relation between ions structure and speeds of sound is presented by highlighting existing correlation and evaluative methods described in the literature. Importantly, a critical analysis of speeds of sound in ILs vs those in classical molecular solvents is presented to compare these two classes of compounds. The last part presents the importance of acoustic investigations for chemical engineering design and possible industrial applications of ILs.

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Density and Viscosity for Binary Mixtures of the Ionic Liquid 1-Butyl-3-methylimidazolium Tetrafluoroborate with 2-Propanol, N,N-Dimethylacetamide and N,N-Dimethylformamide at 293.15–323.15 K: Experimental and PC-SAFT Modeling

et al. 2020

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Thermophysical and Spectroscopic Studies of Pure 1-Butyl-3-methylimidazolium Tetrafluoroborate and Its Aqueous Mixtures

Cited by 30 publications

References 54 publications

The Composition of Saturated Vapor over 1-Butyl-3-methylimidazolium Tetrafluoroborate Ionic Liquid: A Multi-Technique Study of the Vaporization Process

The Composition of Saturated Vapor over 1-Butyl-3-methylimidazolium Tetrafluoroborate Ionic Liquid: A Multi-Technique Study of the Vaporization Process

Speed of Sound and Ultrasound Absorption in Ionic Liquids

Density and Viscosity for Binary Mixtures of the Ionic Liquid 1-Butyl-3-methylimidazolium Tetrafluoroborate with 2-Propanol, N,N-Dimethylacetamide and N,N-Dimethylformamide at 293.15–323.15 K: Experimental and PC-SAFT Modeling

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