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

详细信息    查看全文

• 作者：Fernando Hevia ; Ana Cobos ; Juan Antonio González ; Isaías García de la Fuente ; Luis Felipe Sanz
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：April 14, 2016
• 年：2016
• 卷：61
• 期：4
• 页码：1468-1478
• 全文大小：484K
• 年卷期：0
• ISSN：1520-5134

文摘

Values of density (ρ), speed of sound (c) and refractive index (n_D) 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, n_D values were obtained by means of a RFM970 refractometer from Bellingham+Stanley. The experimental ρ, c and n_D values have been used to determine excess molar volumes, V_m^E, excess adiabatic compressibilities, κ_S^E, excess speeds of sound, c^E, excess thermal expansion coefficients, α_p^E, and excess refractive indices, n_D^E. This set of data shows the existence of interactions between unlike molecules and of structural effects in the mixtures under study. V_m^E values of solutions including linear secondary amines are lower than those of mixtures with linear primary amines. In fact, the contribution to V_m^E 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.