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Thermodynamics of Amide + Amine Mixtures. 1. Volumetric, Speed of Sound, and Refractive Index Data for N,N-Dimethylformamide + N-Propylpropan-1-amine, + N-Butylbutan-1-amine, + Butan-1-amine, or + Hexan-1-amine Systems at Several Temperatures

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G.E.T.E.F., Departamento De Física Aplicada, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain
*E-mail: [email protected]. Fax: +34-983-423136. Tel: +34-983-423757.
Cite this: J. Chem. Eng. Data 2016, 61, 4, 1468–1478
Publication Date (Web):March 30, 2016
https://doi.org/10.1021/acs.jced.5b00802
Copyright © 2016 American Chemical Society

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    Abstract

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    Values of density (ρ), speed of sound (c) and refractive index (nD) for N,N-dimethylformamide (DMF) + N-propylpropan-1-amine (DPA) or + butan-1-amine (BA) mixtures at (293.15−303.15) K, and for DMF + N-butylbutan-1-amine (DBA) or hexan-1-amine (HxA) mixtures at 298.15 K are reported. Density and speed of sound measurements were conducted using a vibrating-tube densimeter and sound analyser, Anton Paar model DSA5000; refractive index values, nD values were obtained by means of a RFM970 refractometer from Bellingham+Stanley. The experimental ρ, c and nD values have been used to determine excess molar volumes, VmE, excess adiabatic compressibilities, κSE, excess speeds of sound, cE, excess thermal expansion coefficients, αpE, and excess refractive indices, nDE. This set of data shows the existence of interactions between unlike molecules and of structural effects in the mixtures under study. VmE values of solutions including linear secondary amines are lower than those of mixtures with linear primary amines. In fact, the contribution to VmE from the breaking of amine−amine interactions is larger for the latter systems. Calculations on Rao’s constant point out that there is no complex formation between the mixture components. Dispersive interactions have been analyzed by means of the molar refraction. It is shown that solutions with DPA or HxA are characterized by similar dispersive interactions and that they mainly differ by dipolar interactions.

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    • Values of VmE and nDE at the working temperatures and values of αp, αpE, κSE, cE at 298.15 K (PDF)

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