Ion solvation in methanol—organic cosolvent mixtures Part 5. Enthalpies of transfer of inorganic ions in mixtures of methanol and propylene carbonate at 298.15 K

Piekarska, Alina

doi:10.1016/0040-6031(94)80206-8

Cited by 8 publications

(9 citation statements)

References 16 publications

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“…It follows from the analysis that in these almost isodielectric mixtures, the ioncosolvent interactions connected with the donor-acceptor properties of the mixed solvent components are more important than their electric permittivity. On the other hands, in the mixtures of methanol and propylene carbonate the dissolution enthalpy of NaI does not substantially change its value within the wide range of the MeOH content [18]. From the point of view of this article topic, it is important that in the range of high methanol content in the mixed solvents, both the growth and decrease in the dissolution enthalpies of NaI depending on the kind of the cosolvent are observed.…”

Section: Solutions In Methanol-cosolvent Mixturesmentioning

confidence: 89%

“…From the point of view of this article topic, it is important that in the range of high methanol content in the mixed solvents, both the growth and decrease in the dissolution enthalpies of NaI depending on the kind of the cosolvent are observed. The same concerns the transfer enthalpies of electrolytes with organic ions [18][19][20][21][22][23] as well as the single ionic transfer enthalpies [18][19][20][21][22][23]. Therefore, …”

Section: Solutions In Methanol-cosolvent Mixturesmentioning

confidence: 99%

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Thermochemistry of electrolyte solutions

Piekarski

2011

J Therm Anal Calorim

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The results of calorimetric investigations of electrolyte solutions in the mixtures of water, methanol, N,N-dimethylformamide, and acetonitrile with numerous organic cosolvents are discussed with regard to the intermolecular interactions that occur in the solution. Particular attention is given to answer the questions how and to what extent the properties of the systems examined are modified by the cosolvent added and how much the properties of the cosolvent are revealed in the mixtures with the solvents mentioned above. To this goal, the analysis of the electrolyte dissolution enthalpies, single ionic transfer enthalpies, and enthalpic pair interaction coefficients as well as the preferential solvation (PS) model are applied. The analysis performed shows that in the case of the dissolution enthalpies of simple inorganic electrolytes in waterorganic solvent mixtures, the shape of the dependence of the standard dissolution enthalpy on the mixed solvent composition reflects to a large extent the hydrophobic properties of the organic cosolvent. In the mixtures of methanol with organic cosolvents, the ions are preferentially solvated either by methanol molecules or by molecules of the cosolvent, depending on the properties of the mixed solvent components. The behavior of inorganic salts in the mixtures containing N,N-dimethylformamide is mostly influenced by the DMF which is a relatively strongly ion solvating solvent, whereas in acetonitrile mixtures, the thermochemical behavior of electrolyte solutions is influenced to a large extent by the properties of the cosolvent particularly due to the PS of cation by the cosolvent molecules.

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Section: Solutions In Methanol-cosolvent Mixturesmentioning

confidence: 89%

Section: Solutions In Methanol-cosolvent Mixturesmentioning

confidence: 99%

Thermochemistry of electrolyte solutions

Piekarski

2011

J Therm Anal Calorim

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“…Systematic studies on the solvation of electrolytes in binary solvents have been carried out for many years in our laboratory. At first, we examined widely the electrolyte solutions in numerous water + organic solvent mixtures. , Then we extended these studies to electrolyte solutions in binary organic solvents containing methanol (protic, hydrogen bonded solvent) − or N , N -dimethylformamide (aprotic, proton-acceptor, non-hydrogen bonded solvent). − As a continuation of these studies, we have undertaken investigations of electrolyte solutions in the mixtures of several organic solvents and acetonitrile, which due to its polarity is a good solvent for both electrolytes and nonelectrolytes. Moreover, acetonitrile molecules, in contrast to the mentioned above solvents, are not able to form H-bonds in the “classical” sense either as a proton-donor or as a proton-acceptor.…”

Section: Introductionmentioning

confidence: 99%

Volumes, Heat Capacities, and Compressibilities of the Mixtures of Acetonitrile with N,N-Dimethylacetamide and Propylene Carbonate

2010

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The densities of the mixtures of acetonitrile and N,N-dimethylacetamide or propylene carbonate were measured within the whole composition range of the systems at temperatures (308.15 and 318.15) K, while the isobaric heat capacity and speed of sound in these mixtures were measured within the whole composition range at 298.15 K. The results obtained were used to calculate the excess molar volume and isobaric heat capacity and the partial molar volumes and heat capacities of both components of the mixtures as well as the adiabatic (κ S ) and isothermal (κ T ) compressibility and their excess. The internal pressures of the systems were also calculated. The results have been analyzed and discussed.

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“…On the other hand, no correlation was found between the values of h xy and the molar heat capacity of the interactions, DC p(int) in methanol. Therefore, one can assume that the differentiation of h xy is more affected in methanol than in water by the effects of direct ion-non-electrolyte molecule interactions, especially the effects of selective ion solvation [12][13][14]. The addition of an organic non-electrolyte to methanol modifies the properties of methanol as the solvent of the electrolyte.…”

Section: Enthalpic Pair Interaction Coefficientsmentioning

confidence: 99%

“…The further studies carried out in our laboratory have been devoted to interactions in methanol solutions [10][11][12][13][14]. Methanol solutions in some respects show similar properties to those of aqueous solutions and in others they resemble DMF solutions.…”

Section: Introductionmentioning

confidence: 99%

Enthalpic interaction coefficients of NaI–alkanediol pairs in methanol and in water

Piekarski

Pietrzak

2011

J Therm Anal Calorim

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The dissolution enthalpies of NaI in the mixtures of methanol with 1,2-alkanediols (1,2-propanediol, 1,2-butanediol, 1,2-pentanediol) and with a,x-alkanediols (1,3-propanediol, 1,4-butanediol, 1,5-pentanediol), as well NaI in the mixtures of water with 1,3-propanediol and 1,2pentanediol, were determined at 298.15 K. The energetic effect of interactions between the investigated alkanediols and NaI in methanol and in water was calculated using the enthalpic pair interaction coefficients (h xy) model. These results along with the other data concerning the NaI-nonelectrolyte pairs taken from our earlier reports and from the literature were analyzed with respect to the effect of the non-electrolyte properties on the variations of the h xy values. The group contributions illustrating the interactions of NaI with selected functional groups in non-electrolyte (alkanediol and alkanol) molecules, namely: CH 2 and OH groups were calculated and discussed.

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Ion solvation in methanol—organic cosolvent mixtures Part 5. Enthalpies of transfer of inorganic ions in mixtures of methanol and propylene carbonate at 298.15 K

Cited by 8 publications

References 16 publications

Thermochemistry of electrolyte solutions

Thermochemistry of electrolyte solutions

Volumes, Heat Capacities, and Compressibilities of the Mixtures of Acetonitrile with N,N-Dimethylacetamide and Propylene Carbonate

Enthalpic interaction coefficients of NaI–alkanediol pairs in methanol and in water

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