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Thermodynamics of Amide + Amine Mixtures. 2. Volumetric, Speed of Sound and Refractive Index Data for N,N-Dimethylacetamide + N-Propylpropan-1-Amine, + N-Butylbutan-1-Amine, + Butan-1-Amine, or + Hexan-1-Amine Systems at Several Temperatures

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Abstract

Data on density, ρ, speed of sound, c, and refractive index, n D, of binary systems containing N,N-dimethylacetamide (DMA) + N-propylpropan-1-amine (DPA) or + butan-1-amine (BA) at 293.15, 298.15 and 303.15 K, and + N-butylbutan-1-amine (DBA) or + hexan-1-amine (HxA) at 298.15 K are reported. A densimeter and sound analyzer Anton Paar DSA5000 has been used for the measurement of ρ and c, whereas n D values have been obtained by means of a refractometer RFM970 from Belingham and Stanley. Also, values of excess molar volumes, \( V_{\text{m}}^{\text{E}} \), excess isentropic compressibilities, \( \kappa_{S}^{\text{E}} \), excess speeds of sound, c E, excess isobaric thermal expansion coefficients, \( \alpha_{p}^{\text{E}} \), and of excess refractive indices, \( n_{\text{D}}^{\text{E}} \), have been determined from these data. The investigated systems are characterized by amide–amine interactions and structural effects, as is shown by their negative or small positive \( V_{\text{m}}^{\text{E}} \) values and by the results from the application of the Prigogine–Flory–Patterson (PFP) model. The breaking of amine–amine interactions is more relevant in systems containing primary amines than in those with linear secondary amines, and the \( V_{\text{m}}^{\text{E}} \) values are lower for the latter systems. Molar refraction has been used to evaluate the dispersive interactions in the mixtures under study, yielding the result that the DPA and HxA systems present similar dispersive interactions and mainly differ in their dipolar character. Steric hindrance of the amide group in DMA leads to weaker amide–amine interactions than in the corresponding N,N-dimethylformamide (DMF) + amine systems.

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Acknowledgements

F. Hevia gratefully acknowledges the grant received from the program ‘Ayudas para la Formación de Profesorado Universitario (convocatoria 2014), de los subprogramas de Formación y de Movilidad incluidos en el Programa Estatal de Promoción del Talento y su Empleabilidad, en el marco del Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016, de la Secretaría de Estado de Educación, Formación Profesional y Universidades, Ministerio de Educación, Cultura y Deporte, Gobierno de España’.

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  1. G.E.T.E.F., Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén, 7, 47011, Valladolid, Spain

    Fernando Hevia, Ana Cobos, Juan Antonio González, Isaías García de la Fuente & Víctor Alonso

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Hevia, F., Cobos, A., González, J.A. et al. Thermodynamics of Amide + Amine Mixtures. 2. Volumetric, Speed of Sound and Refractive Index Data for N,N-Dimethylacetamide + N-Propylpropan-1-Amine, + N-Butylbutan-1-Amine, + Butan-1-Amine, or + Hexan-1-Amine Systems at Several Temperatures. J Solution Chem 46, 150–174 (2017). https://doi.org/10.1007/s10953-016-0560-0

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