Application of scaled particle theory to the partial molar volumes of some tetradentate N2O2 type Schiff bases in ionic liquid+DMF solutions

Apparent molar volumes (V2, ϕ ) and standard partial-molar volumes (V20, ϕ ) of LiClO4 and LiBr at 298.15 K have been determined from precise density measurements in solvent mixtures of propylene carbonate (PC) with dimethylformamide (DMF), tetrahydrofuran (THF), acetonitrile (AN), and methyl formate (MF). The scaled particle theory is used to calculate the contributions of the cavity formation and the electrolyte-solvent interactions to the standard partial-molar volumes. It is shown that V20, ϕ is strongly dependent on the nature of the solvents, and the trends in V20, ϕ with composition of the solvent mixtures are determined by the interaction volumes of electrolytes with solvents. The results are discussed in terms of ionic preferential solvation, packing effect of solvents in the solvation shell, and electrostriction of solvents by ion.Key words: partial-molar volume, scaled particle theory, lithium salts, propylene carbonate, solvent mixtures, lithium battery electrolytes.

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Solubility of nonpolar gases in 2,2,2-trifluoroethanol and 1,1,1,3,3,3-hexafluoropropan-2-ol at several temperatures and 101.33 kPa partial pressure of gas

Canadian Journal of Chemistry ◽

10.1139/v01-160 ◽

2001 ◽

Vol 79 (10) ◽

pp. 1460-1465 ◽

Cited By ~ 12

Author(s):

Miguel Angel Sánchez ◽

Ana María Mainar ◽

Juan Ignacio Pardo ◽

María Carmen López ◽

José Santiago Urieta

Keyword(s):

Partial Pressure ◽

Thermodynamic Functions ◽

Partial Molar Volumes ◽

Scaled Particle Theory ◽

Particle Theory ◽

Molar Volumes ◽

Gas Solubilities ◽

Enthalpy And Entropy ◽

Solubility Of Nonpolar Gases

Solubilities, expressed as mol fractions, of 14 nonpolar gases (He, Ne, Ar, Kr, Xe, H2, N2, O2, CH4, C2H4, C2H6, CO2, CF4, and SF6) in 2,2,2-trifluoroethanol (TFE) at 268.15 and 283.15 K and 1,1,1,3,3,3-hexafluoropropan-2-ol (HFIP) at 273.15 and 283.15 K, with the partial pressure of gas being 101.33 kPa for all measurements, are reported. Standard changes in the thermodynamic functions (enthalpy and entropy) have been calculated from the solubilities and their variation with temperature. The Scaled Particle Theory (SPT) model has been used to determine these thermodynamic functions and also the partial molar volumes of the gases in the formed solutions.Key words: gas solubilities, nonpolar gases, fluoroalcohols, Scaled Particle Theory.

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Partial molar volumes of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate in n-donor solvents

Russian Chemical Bulletin ◽

10.1007/s11172-012-0074-x ◽

2012 ◽

Vol 61 (3) ◽

pp. 506-509

Author(s):

V. D. Kiselev ◽

I. I. Shakirova ◽

A. I. Konovalov

Keyword(s):

Ionic Liquid ◽

Partial Molar Volumes ◽

Molar Volumes

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Correlation and prediction of the physical and excess properties of the ionic liquid 1-butyl-3-methylimidazolium methyl sulphate with several alcohols at T= (298.15 to 313.15) K

10.51415/10321/876 ◽

2013 ◽

Author(s):

◽

Sangeeta Singh

Keyword(s):

Refractive Index ◽

Ionic Liquid ◽

Binary Mixtures ◽

Binary Systems ◽

Excess Molar Volumes ◽

Partial Molar Volumes ◽

Excess Properties ◽

Excess Isentropic Compressibilities ◽

Molar Volumes ◽

Isentropic Compressibilities

The thermodynamic properties of binary liquid mixtures using an ionic liquid (IL) with alcohols were determined at different temperatures. The ionic liquid used was 1-butyl-3- methylimidazolium methylsulphate [BMIM]+[MeSO4]-. Densities, speed of sound, and refractive indices for the binary mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or 1-butanol) were experimentally measured over the whole range of composition at T = (298.15, E 303.15, 308.15, and 313.15) K. From the experimental data, excess molar volumes, V m , E , deviations in refractive isentropic compressibilities, κ s , excess isentropic compressibilities, κ S indices, ∆n, and molar refractions, R, were calculated. The excess partial molar volumes were also calculated at T = 298.15 K. For the binary systems, ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or E E E 1-butanol) V m and κ S are always negative and V m decrease slightly when the temperature increases. The refractive index deviation at T = (298.15, 303.15, 308.15, and 313.15) K is positive over the whole composition range. The measured negative values for excess molar volume of these mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or 1-butanol) indicate strong ion-dipole interactions and packing between alcohols and IL are present. The Redlich-Kister smoothing polynomial equation was satisfactorily applied for the E E fitting of the V m , κ S , and ∆n data to give the fitting parameters and the root-mean-square deviations. The Lorentz-Lorenz (L-L) equation was also used to correlate the volumetric property and predict the density or refractive index of the binary mixtures of ionic liquid and the organic solvents. The Lorentz-Lorenz approximation gives a higher σ when used to correlate the iiiexcess molar volumes for the mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or 1-butanol). The L-L equation gives good results for the prediction of density and refractive index. The results are discussed in terms of solute-solute, solute-solvent and solvent- solvent interactions.

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Volumetric studies of ion solvation in propylene carbonate + N,N-dimethylformamide electrolyte solutions

Canadian Journal of Chemistry ◽

10.1139/v03-061 ◽

2003 ◽

Vol 81 (4) ◽

pp. 307-314 ◽

Cited By ~ 6

Author(s):

Yang Zhao ◽

Jianji Wang ◽

Xiaopeng Xuan ◽

Ruisen Lin

Keyword(s):

Propylene Carbonate ◽

Tetrabutylammonium Bromide ◽

Partial Molar Volumes ◽

Lewis Base ◽

Ion Solvation ◽

Scaled Particle Theory ◽

Solvent Mixtures ◽

Tetraethylammonium Bromide ◽

Molar Volumes ◽

Tetraalkylammonium Cations

Apparent molar volumes V2,ϕ and standard partial molar volumes V°2,ϕ for tetraethylammonium bromide (Et4NBr), tetrapropylammonium bromide (Pr4NBr), tetrabutylammonium bromide (Bu4NBr), and tetrahexylammonium bromide (Hex4NBr) have been determined at 298.15 K from precise density measurements in solvent mixtures of propylene carbonate (PC) with N,N-dimethylformamide (DMF). Combined with our previous data for LiClO4 and LiBr in the same solvents, ionic molar volumes of Li+, Et4N+, Pr4N+, Bu4N+, Hex4N+, and related anions have been deduced from the extrapolation method suggested by Conway and co-workers. It is shown that the molar volumes of these cations are quite independent of the nature of the solvent and the composition of the solvent mixtures, in contrast to those of ClO4 and Br anions. This suggests that the Lewis-base-type solvents with similar molecular volumes have similar interactions with Li+. The constancy in partial molar volume for tetraalkylammonium ions provides helpful evidence for the lack of solvation of large tetraalkylammonium cations in organic solvents. These findings have been interpreted using scaled-particle theory. The results are discussed in terms of ion solvation, packing effects of solvent molecules in the solvation shell, and the electrostriction of solvents.Key words: ionic volumes, propylene carbonate, N,N-dimethylformamide, solvent mixtures, solvation, lithium batteries.

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Partial Molar Volumes of Some Multicharged Electrolytes in Aqueous Dimethylformamide at Various Temperatures

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19980507 ◽

1998 ◽

Vol 63 (4) ◽

pp. 507-514

Author(s):

Madan L. Parmar ◽

Ch. V. Nageshwara Rao ◽

Suresh Chand Attri

Keyword(s):

Partial Molar Volumes ◽

Water Systems ◽

Molar Volumes ◽

Density Measurements ◽

Solution Density ◽

Aluminium Sulfate ◽

Ion Interactions

Partial molar volumes of ammonium aluminium sulfate and potassium aluminium sulfate in DMF-water mixtures (5-20 wt.% of DMF) have been determined from solution density measurements at various temperatures and electrolyte concentrations. The data were evaluated by using Masson equation and the obtained parameters were interpreted in terms of ion-solvent and ion-ion interactions. Both electrolytes have been found to act as the structure makers/promotors in DMF-water systems.

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