Thermodynamics of solvation of some linear and branched aliphatic aldehydes in water and heptane

Thermodynamics of solvation of some linear and branched aliphatic aldehydes in water and heptane

The enthalpies of dissolution in water at infinite dilution (i.d.), Δ H tot ∞ , of propanal, butanal, 2-methylpropanal, pentanal, and 2,2-dimethylpropanal were measured by isothermal calorimetry at T = 298.15 K. The enthalpies of solution, Δ sol H m ∞ , in water were derived by subtracting the entha...

Full description

Saved in:
Bibliographic Details
Published in:The Journal of chemical thermodynamics Vol. 42; no. 10; pp. 1204 - 1208
Main Authors: Della Gatta, G., Badea, Elena, Saczuk, Magdalena
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01-10-2010
Elsevier
Subjects:
Aldehydes
Aliphatic aldehydes
Aliphatic compounds
Branched
Chemical thermodynamics
Chemistry
Dissolution
Enthalpy
Exact sciences and technology
General and physical chemistry
Heptanes
Isothermal calorimetry
Mathematical analysis
Mixtures
Solvation
Solvation enthalpy in water and heptane
Thermodynamic properties
Isothermal calorimetry
Aliphatic aldehydes
Solvation enthalpy in water and heptane
Water
Isothermal condition
Hydrocarbon
Aliphatic compound
Enthalpy
Aldehyde
Branched compound
Heptane
Organic solvent
Thermodynamics
Solvation
Calorimetry
Thermal analysis
Thermodynamic properties
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The enthalpies of dissolution in water at infinite dilution (i.d.), Δ H tot ∞ , of propanal, butanal, 2-methylpropanal, pentanal, and 2,2-dimethylpropanal were measured by isothermal calorimetry at T = 298.15 K. The enthalpies of solution, Δ sol H m ∞ , in water were derived by subtracting the enthalpies of the hydration reaction at 298.15 K from the measured enthalpies of dissolution. The values obtained were combined with the standard enthalpies of vaporisation, Δ vap H m ∘ , to obtain the corresponding enthalpies of solvation at i.d., Δ solv H m ∞ . The CH 2 group contribution to Δ solv H m ∞ in water for linear aliphatic aldehydes was (−3.4 ± 0.5) kJ · mol −1 in good agreement with the average value obtained for a large number of organic compounds containing linear alkyl chains. The simple additive method adopted to estimate the molar enthalpy of solvation at i.d in water for the CHO functional group and its internal CO group gave (−28.1 ± 1.5) kJ · mol −1 and (−22.5 ± 1.5) kJ · mol −1, respectively. The enthalpies of solvation in heptane of linear and branched aldehydes with 3 to 11 C atoms were obtained using our earlier enthalpies of solution at i.d. and T = 298.15 K and recent experimental enthalpies of vaporisation from literature. Methylene group contribution to Δ solv H m ∞ for linear aliphatic aldehydes in heptane was (−4.8 ± 0.1) kJ · mol −1. Enthalpy of transfer from heptane to water for CH 2 group was (2.1 ± 0.4) kJ · mol −1.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0021-9614
1096-3626
DOI:10.1016/j.jct.2010.04.017