This study reports the experimental relative permittivity, refractive index, and density data for several polar binary systems containing a cyclic ketone (cyclopentanone) and a series of alkanols from C 2 to C 10 over the entire composition range at T = 298.15 and p = 101.3 kPa. Further study was performed on a polar−nonpolar system composed of cyclopentanone and cyclohexane at the mentioned temperature and pressure. The experimental data were analyzed with various approaches in a consistence framework and in terms of intermolecular interactions between the constituent molecules. The effective and corrective Kirkwood correlation factors were calculated, in order to investigate the H-bond structure formation in the mixtures. The intermolecular interactions were investigated through various excess parameters, namely, excess permittivity, excess refractive index, excess molar volumes, excess Helmholtz energies, and excess Kirkwood correlation factors.

Relative permittivities, refractive indices, and densities were measured for binary liquid mixtures of cyclohexanone with 1-alkanols (ethanol, 1-butanol, 1-hexanol, 1-octanol, and 1-decanol) in the mole fraction range of (0 ≤ x 2 ≤ 1) at T = 298.15 and p = 101.3 kPa. Another comparative dielectric study was performed on the (cyclohexanone or cyclopentanone + cyclohexanol or cyclohexane) mixtures at the mentioned temperature and pressure. The experimental data were analyzed in terms of the various approaches in order to obtain information about the intermolecular interactions and the mixture structure. The excess properties of different physical quantities confirm the formation of hydrogen-bond structure in these mixtures. For the studied systems, negative excess permittivities and excess Kirkwood correlation factors were obtained, indicating a reduction of the number of effective dipoles in the binary mixtures.