Enthalpies of solvation in cyclohexane and in water for homologous aliphatic ketones and esters

Gatta, Giuseppe; Stradella, L.; Venturello, Paolo

doi:10.1007/bf00653098

Cited by 56 publications

(27 citation statements)

References 14 publications

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“…In the similar way vapor pressures were measured by the static method [18]. However, the molar enthalpy of vaporization of methyl butanoate g l H m (298.15 K) = 43.7 ± 0.3 kJ mol −1 measured in this work (see Table 2) agrees well within error bars with the most of available indirect results presented in Table 2, and is also in a close agreement with the direct calorimetric results reported in the literatures [12][13][14].…”

Section: Vapor Pressure Of Methyl Butanoatesupporting

confidence: 90%

“…3. The results measured using the ebulliometry [22] and using static diaphragm manometry [18] are very consistent with each other and with our new results from the transpiration method (see Table 1) and appropriate enthalpies of vaporization derived from these three techniques are in a close agreement (see Table 2) and also with the direct calorimetric results [13,14,20].…”

Section: Vapor Pressure Of Methyl Pentanoatesupporting

confidence: 88%

“…of vaporization from their results. That is why the original published experimental results [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] were treated using Eqs.…”

Section: Resultsmentioning

confidence: 99%

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Transpiration method: Vapor pressures and enthalpies of vaporization of some low-boiling esters

Verevkin¹,

Emel′yanenko²

2008

Fluid Phase Equilibria

175

140

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Section: Vapor Pressure Of Methyl Butanoatesupporting

confidence: 90%

Section: Vapor Pressure Of Methyl Pentanoatesupporting

confidence: 88%

See 1 more Smart Citation

Transpiration method: Vapor pressures and enthalpies of vaporization of some low-boiling esters

Verevkin¹,

Emel′yanenko²

2008

Fluid Phase Equilibria

175

140

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“…In particular, enthalpies of sublimation and vaporization can be combined with enthalpies of solution at infinite dilution of solid and liquid compounds, respectively, to obtain enthalpies of solvation [1,2] …”

mentioning

confidence: 99%

Enthalpies of sublimation and fusion for N-acetyl substituted glycine, L-alanine, and D-leucine amides

Ferro

Gatta

Barone

1988

Journal of Thermal Analysis

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Enthalpies and entropies of sublimation for N-acetylglycine amide (NAGA), N-aeetyl-Lalanine amide (L-NAAA), and N-acetyl-D-leucine amide (D-NALA) were determined from the dependence of their vapour pressures on temperature, as measured by the torsion-effusion method.Enthalpies and temperatures of fusion were measured by differential scanning calorimetry (DSC) and entropies of fusion were derived. No solid-to-solid transitions were detected from r.t. to fusion. Enthalpies of sublimation and fusion were combined to evaluate enthalpies of vaporization of the melts.The experimental results decreased inversely to the molecular mass. An interpretation of this trend in terms of the crystalline structure of these compounds is proposed.Reliable thermodynamic data on evaporation processes of low-molar-mass organic compounds are of great importance in several fields, ranging from organic chemistry to biochemistry and biophysics. In particular, enthalpies of sublimation and vaporization can be combined with enthalpies of solution at infinite dilution of solid and liquid compounds, respectively, to obtain enthalpies of solvation [1,2]

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“…On the other hand, vaporization at rates low enough to maintain acceptable equilibrium conditions produced very small heat effects, and calorimeters with very high sensibility were required. Lastly, the calorimetric apparatuses were, except in very few cases [12,13,16], "home-made" and thus of limited employment.…”

mentioning

confidence: 99%

Direct determination of enthalpies of vaporization of liquid compounds by a miniaturized effusion cell adapted to a commercial microcalorimeter

Barone

Gatta

Elia

1984

Journal of Thermal Analysis

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A miniaturized effusion cell adapted to a Sorpt~on LKB microcatorimeter has been designed, built and tested. Vaporization is performed isothermally into a vacuum through a small orifice permitting a vapour pressure very close to the equilibrium values. The cell has been tested by measuring the enthalpies of vaporization at 298.15 K of reference liquid compounds (water, benzene, propanol-1, propanol-2) with a reproducibility better than 1%. Enthalpies of vaporization of butanol-1 and deuterated water have also been determined.Accurate knowledge of the enthalpies of vaporization of both liquid and solid compounds is of greatest importance in a wide spectrum of thermodynamic calculations, from enthalpies of formation [1] to enthalpies of solvation [2]. This accuracy is the more indispensable the weaker the interactions concerned are. In particular, AvapH values are employed to obtain enthalpies of solvation from solution heats at infinite dilution, allowing a closer description of the solute-solvent interactions [3, 4], as well as the possible partition of different contributions (e.g. solvent restructuring effect and hydrophobic interactions).The additive character of the vaporization enthalpies has been proved but the correlations so far established [5][6][7][8] are restricted to liquid compounds of relatively small dimensions and simple molecular structure (e.g. with linear chain substituents). Direct and very precise determinations of vaporization enthalpies are thus increasingly required, particularly in connection with the more widespread employment of highsensitivity microcalorimeters.Several experimental techniques for the calorimetric determination of vaporization enthalpies for both liquid and solid compounds have been developed in the last twenty years |9-16], Part are based on the measurement of the heat required to vaporize a well-known amount of substance into a vacuum under defined conditions as close as possible to the equilibrium values. These direct methods have proved useful, but their 9

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Enthalpies of solvation in cyclohexane and in water for homologous aliphatic ketones and esters

Cited by 56 publications

References 14 publications

Transpiration method: Vapor pressures and enthalpies of vaporization of some low-boiling esters

Transpiration method: Vapor pressures and enthalpies of vaporization of some low-boiling esters

Enthalpies of sublimation and fusion for N-acetyl substituted glycine, L-alanine, and D-leucine amides

Direct determination of enthalpies of vaporization of liquid compounds by a miniaturized effusion cell adapted to a commercial microcalorimeter

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