Gibbs energies, entropies and enthalpies of transfer for monovalent cations from acetonitrile to several solvents

1993 ◽  
Vol 89 (19) ◽  
pp. 3557-3564 ◽  
Author(s):  
Franz Hörzenberger ◽  
Gerhard Gritzner
Keyword(s):  
Monovalent Cations ◽  
Enthalpies Of Transfer ◽  
Gibbs Energies

The distribution of branched octanols between dodecane and water

1985 ◽  
Vol 63 (4) ◽  
pp. 789-792 ◽  
Author(s):  
Norman H. Sagert ◽  
Danny W. P. Lau
Keyword(s):  
Thermodynamic Functions ◽  
Distribution Data ◽  
Standard Entropy ◽  
Standard Thermodynamic Functions ◽  
Enthalpies Of Transfer ◽  
Data Standard ◽  
Gibbs Energies ◽  
Gibbs Energies Of Transfer ◽  
Branched Chain ◽  
Entropy Of Transfer

The distribution of four branched chain octanols, 3-ethyl-3-hexanol, 4-ethyl-3-hexanol, 2-ethyl-4-methylpentanol, and 4-octanol, has been measured between dodecane and water. Measurements were made at alcohol concentrations in the dodecane of less than 0.1 mol/dm3, and as a function of temperature from 10 °C to 35 °C. From these distribution data, standard thermodynamic functions for transfer were calculated. Standard Gibbs energies of transfer from water to dodecane at 25 °C were in the range −14.1 to −15.1 kJ/mol, whereas the standard enthalpies of transfer at 25 °C varied from 29 to 39 kJ/mol. Thus, the change in the standard enthalpy tends to inhibit transfer, but a large standard entropy of transfer results in dodecane being the favoured phase.

Thermodynamics and structures in solvents coordinating through nitrogen. I. Enthalpies of transfer from water to pyridine and acetonitrile for some monovalent cations and anions

1983 ◽  
Vol 36 (9) ◽  
pp. 1805 ◽  
Author(s):  
S Ahrland ◽  
S Ishiguro ◽  
R Portanova
Keyword(s):  
Hydrogen Bonding ◽  
Dimethyl Sulfoxide ◽  
Aprotic Solvents ◽  
Protic Solvent ◽  
Monovalent Cations ◽  
Enthalpies Of Transfer ◽  
C 30 ◽  
Tetraalkylammonium Ion

The enthalpies of transfer ΔHtr�, between water and the aprotic solvents pyridine and acetonitrile have been determined for a number of 1-1 electrolytes. To calculate ΔHtr� for the single ions, the tatb assumption that ΔHtr�,(Ph4As+) = ΔHtr�BPh4-) for all solvents has been applied. The results are compared with those found earlier for the transfer between water and dimethyl sulfoxide. The values of ΔHtr�, differ widely between different ions, from exothermic by c. 30 kJ/mol to endothermic by about the same amount. Endothermic values are found for Cl- and, though much smaller, for Br-, and also for the large tetraalkylammonium ion Bu4N+. Compared to the differences in ΔHtr�, found between the various ions, the differences found for a certain ion between different solvents are small. The decrease of AH,", in the sequence Cl- > Br- > I- runs almost parallel in the three aprotic solvents, and is much less steep than in water. This reflects the influence of ligand hydrogen bonding in the protic solvent.

Solubility and Thermodynamic Transfer Functions of Cesium Dianilinetetraisothiocyanatochromate(III)

1998 ◽  
Vol 63 (3) ◽  
pp. 293-298
Author(s):  
Vladislav Holba
Keyword(s):  
Experimental Data ◽  
Isopropyl Alcohol ◽  
Transfer Functions ◽  
Butyl Alcohol ◽  
Aqueous Methanol ◽  
Gibbs Energies ◽  
Gibbs Energy Of Transfer ◽  
Energy Of Transfer ◽  
The Given ◽  
Reference Electrolyte

The solubilities of cesium dianilinetetraisothiocyanatochromate(III) in water as well as in aqueous methanol, isopropyl alcohol, tert-butyl alcohol and acetonitrile were measured as a function of temperature and solvent composition. The Gibbs energies, enthalpies and entropies of transfer of the salt from water to the given solvents have been evaluated from experimental data. The contribution of [Cr(C6H5NH2)2(NCS)4]- ion to the Gibbs energy of transfer of the investigated salt has been calculated using the tetraphenylarsonium tetraphenylborate (TATB) reference electrolyte assumption.

Activity Coefficients and Gibbs Energies of Transfer of Tetraalkylammonium Dianilinetetraisothiocyanatochromates(III)

1994 ◽  
Vol 59 (8) ◽  
pp. 1738-1744
Author(s):  
Vladislav Holba
Keyword(s):  
Activity Coefficients ◽  
Transfer Functions ◽  
Butyl Alcohol ◽  
Methyl Ethyl ◽  
Tetraalkylammonium Ions ◽  
Ionic Transfer ◽  
Gibbs Energies ◽  
Gibbs Energies Of Transfer ◽  
Acetonitrile Solutions ◽  
Mixed Systems

The solubilities of tetraalkylammonium dianilinetetraisothiocyanatochromates(III) (alkyl = methyl, ethyl, 1-propyl, and 1-butyl) in water, water - methanol, water - tert-butyl alcohol and water - acetonitrile solutions were measured at 25 °C. The results were used to evaluate the activity coefficients and Gibbs energies of transfer of the saturating salts from water to the mixed systems. The Gibbs energies of transfer of the [Cr(C6H5NH2)2(NCS)4]- ion were obtained by means of known ionic transfer functions for the tetraalkylammonium ions based on the TATB assumption.

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