2026-04-28T21:14:33Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/691672024-07-29T19:01:52Zcom_10324_1157com_10324_931com_10324_894col_10324_1298

00925njm 22002777a 4500 dc Hevia de los Mozos, Luis Fernando author Cobos Huerga, Ana author González López, Juan Antonio Mariano author García de la Fuente, Isaías Laudelino author Sanz del Soto, Luis Felipe author 2016 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 analyzer, Anton Paar model DSA5000; refractive index, 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 show 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 in dipolar interactions. Journal of Chemical & Engineering Data, 61, 2016, 1468-1478 0021-9568 https://uvadoc.uva.es/handle/10324/69167 10.1021/acs.jced.5b00802 1468 4 1478 Journal of Chemical & Engineering Data 61 1520-5134 Termodinámica 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