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

Abstract

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, κS 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.

Thermodynamics of amide + amine mixtures. 4. Relative permittivities of N,N-dimethylacetamide + N-propylpropan-1-amine, + N-butylbutan-1-amine, + butan-1-amine, or + hexan-1-amine systems and of N,N-dimethylformamide + aniline mixture at several temperatures. Characterization of amine + amide systems using ERAS

“…In fact, inspection of Table 2 shows that, for example, some r ε values of aniline taken from the literature are not sure as they do not change consistently with temperature. In contrast, our r ε values correctly decrease with the increasing of temperature, and the density measurements are in good agreement with literature data (Table S1, supplementary material; see also [23,24] for the remaining amines).…”

“…where r ε is the permittivity of the mixture. The necessary volumetric properties were obtained from the literature [23,24,27] (see also footnote of Table 2). Figure S1, supplementary material).…”

“…In previous studies, we have reported data on density, ρ , speed of sound, c, and refractive index, D n , for the binary systems DMF [23], or DMA [24] + N-propylpropan-1amine (DPA) or + butan-1-amine (BA) at (293.15-303.15) K, and + N-butylbutan-1-amine (DBA) or + hexan-1-amine (HxA) at 298.15 K. These data have interpreted in terms of solutesolvent interactions and structural effects [23,24]. On the other hand, we have also reported permittivity measurements for the DMF + BA, + HxA, + DPA, + DBA systems at (293.…”

“…reported here are used together with the corresponding ρ and D n values available in the literature [23,24,27] to determine orientational and induced polarizabilities according to the Kirkwood-Fröhlich model [28][29][30][31] and the Balankina relative excess Kirkwood correlation factors [32], very useful quantities to gain insight into the dipole correlations present in the mixtures under consideration. Table 1 collects information regarding the source and purity of the pure compounds, which have been used with no further purification.…”

Prediction of Interactions between Binary Mixtures of Aliphatic Amines and Aliphatic Acetates

“…Post combustion of CO2 became necessity with amine based technology because of increasing global warming due to greenhouse gas emissions [1]. In past various parameters of binary mixtures were studied [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The alkyl amines are important organic bases because of their strong electron donating capabilities, further primary and secondary amines are self associated and tertiary amines are weakly polar.…”