Thermochemical Characteristics of the Dissolution of d‑Valine in Aqueous Solutions of Some Amides at T = 298.15 K

Enthalpies of the dissolution of d-valine in the mixtures of water with formamide (FA), N-methylformamide (MFA), N,N-dimethylformamide (DMF) and N,N-dimethylacetamide (DMA) with the mole fraction (x 2) of amides ranging up to 0.3 have been measured at T = 298.15 K. The standard enthalpies of the dis...

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Bibliographic Details
Published in:Journal of chemical and engineering data 2016-05, Vol.61 (5), p.1864-1867
Main Authors: Smirnov, Valeriy I, Badelin, Valentin G
Format: Article
Language:English
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Summary:Enthalpies of the dissolution of d-valine in the mixtures of water with formamide (FA), N-methylformamide (MFA), N,N-dimethylformamide (DMF) and N,N-dimethylacetamide (DMA) with the mole fraction (x 2) of amides ranging up to 0.3 have been measured at T = 298.15 K. The standard enthalpies of the dissolution (Δsol H°) and the transfer enthalpies (Δtr H°) of d-valine have been calculated. On the basis of McMillan–Mayer’s theory, the enthalpic coefficients of pairwise interaction (h xy ) have been calculated. The enthalpic coefficients (h xy ) of the solute–amide pairwise interaction in the water proved to be positive and increasing in the series: FA < MFA < DMF. It is associated with the increasing of the hydrophobic properties of amides and the energy of intermolecular interactions between components of water+organic mixtures in the same sequence.
ISSN:0021-9568
1520-5134
DOI:10.1021/acs.jced.5b01087