Intermolecular interactions of cis-3-hexes-1-ol or 1-hexanol with n-hexane: Thermodynamic study, FT-IR analysis and quantum chemical calculations

Abstract

Thermodynamic properties (density, viscosity, refractive index and speed of sound) of pure substances cis-3-hexen-1-ol, 1-hexanol and n-hexane and their binary systems cis-3-hexen-1-ol + n-hexane and 1-hexanol + n-hexane were measured. All measurements are reported in the range (288.15 to 318.15) K at seven temperatures and at atmospheric pressure. Excess molar volume (V-E), viscosity deviation (Delta eta), refractive index deviation (Delta n(D)) and speed of sound deviation (Delta u) were calculated based on the experimental data. Derivate properties were fitted using Redlich-Kister equation. Additionally, for analyzing the molecular interaction, the FT-IR spectroscopy and quantum chemical calculations were performed. The results show differences in viscosity deviation between cis-3-hexen-1-ol + n-hexane and 1-hexanol + n-hexane mixtures, indicating some specific role of double bonds in properties of the mixtures. The FT-IR spectra indicate change in double bond frequency between pure cis-3-hexen-1-ol and mixture of cis-3-hexen-1-ol + n-hexane, and quantum chemical calculations confirmed the possibility of double bond influence on the properties of the mixtures.