Density, speed of sound, refractive index and relative permittivity of methanol, propan-1-ol or pentan-1-ol + aniline liquid mixtures. Application of the Kirkwood-Fröhlich model

Densities (?) and speeds of sound (c) at a temperature T = 298.15 K, relative permittivities 1 MHz (?r) refractive indices the sodium D-line (nD) (293.15 K to 303.15 K), all them pressure p 0.1 MPa, are reported for binary liquid mixtures alkan-1-ol + aniline. The alkan-1-ols considered methanol, propan-1-ol pentan-1-ol. Also, values excess molar volume (VmE), isentropic compressibility (?SE), speed (cE), index (nDE), permittivity (?rE) its derivative (??rE/?T)p calculated fitted Redlich-Kister polynomials. agreement among data other literature sources is analysed by comparing VmE, nDE, ?rE deviation c from mole-fraction linearity (?c). positive internal energies constant (Um, VE) show dominance breaking interactions between like molecules in energy balance on mixing, particularly strong dipolar aniline molecules. This contribution also dominant values, as they negative decrease with length chain. Calculations concentration-concentration structure factor consistent these statements, revealing homocoordination studied systems. VmE negative, which together Um, VE indicate existence important structural effects mixtures. application Kirkwood-Fröhlich model shows that average orientation neighbouring dipoles similar methanol or pyridine, spite different character predominant latter mixture (heterocoordination).