An Investigation on the Molecular Dynamics of Binary Mixtures of Anisole with Acetic and Propionic Acids

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Temperature dependent dielectric studies were carried out from 303 to 323 K for mixtures of anisole with acetic acid and with propionic acid, in order to investigate the molecular dynamics of these molecules. The low-frequency molecular dynamics of these molecules have been studied by computing some dielectric parameters such as the Kirkwood correlation factor, Bruggeman parameter, excess permittivity and excess Helmholtz energy. The observed Kirkwood effective correlation factor for both binary mixtures at all concentrations and temperatures were found to be less than unity. Negative values of the Bruggeman parameter were obtained for mixtures of anisole with acetic acid whereas positive values were obtained for the mixtures of anisole with propionic acid. The formation of β-multimers, with anti-parallel dipolar orientations, was identified in the above binary mixtures. This investigation showed that changes of temperature did not produce any significant structural changes over the studied temperature interval.