Abstract
Present paper reveals detailed study of dielectric relaxation and dielectric polarization and physicochemical study of binary polar-polar liquid mixture i.e. dielectric constant, relaxation time, viscosity, density of methylethylketone (MEK) with nitrobenzene (NB) at 303 K. The measured dielectric and physicochemical parameters employed to acquire additional derived properties like Bruggeman factor, molar refraction and excess properties like static dielectric constant, excess inverse relaxation time, excess molar volume, excess viscosity, excess molar refraction, Gibbs free energy, and enthalpy of activation. The variation of this parameters with composition of these quantities has been used to explain the type, strength and nature of intermolecular interactions between MEK+NB binary mixture. Attained results authenticate that there are strong hydrogen-bond interactions between unlike molecules of different groups of MEK+NB mixtures and that 1:1 complexes are produced and strength of intermolecular interaction rises with rise in concentration of MEK. KEY WORDS : Bruggeman factor, Excess inverse relaxation time, Dielectric polarization Bull. Chem. Soc. Ethiop. 2019 , 33(2), 349-358. DOI: https://dx.doi.org/10.4314/bcse.v33i2.15
Highlights
Dielectric relaxation study furnishes detail insights of intermolecular interactions of binary liquid mixture [1,2,3]
Precise values of the static dielectric constant, relaxation time, viscosity, density, and refractive index of the MEK+NB binary mixtures were experimentally measured over the complete volume composition range at T = 303 K
The 1:1 complexes of MEK and NB control the molecular dielectric polarization process, whereas MEK:NB (1:1) complexes controls the viscous flow process and their number per unit volume are strong MEK prejudiced by the temperature and concentration
Summary
Dielectric relaxation study furnishes detail insights of intermolecular interactions of binary liquid mixture [1,2,3]. Presence of nitro group to benzene which is present in nitrobenzene taken as solvent, renders a considerable effect on the dielectric properties that shapes enhanced solubility properties [9,10,11] Such phenomenon is more prominent in the solutions of nitrobenzene with ketone group. Equation 2 gives that static permittivity of the binary mixtures ( sm), solute ( sA) and solvent ( sB) are associated to the volume fraction of solvent (V), which specified the interaction among solvent and solute in the mixture is shown as: As per this equation, a linear relationship is expected between the Bruggeman factor fB and the volume (V). The quantitative picture can be visualized by fitting excess properties
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