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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• 作者：Fernando Hevia ; Ana Cobos ; Juan Antonio González…
• 关键词：DMA ; Amine ; Volumetric ; Thermophysical properties ; Interactions ; Structural effects
• 刊名：Journal of Solution Chemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：46
• 期：1
• 页码：150-174
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Industrial Chemistry/Chemical Engineering; Geochemistry; Oceanography; Inorganic Chemistry; Condensed Matter Physics;
• 出版者：Springer US
• ISSN：1572-8927
• 卷排序：46

文摘

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, cE, 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.