Dielectric dispersion and thermodynamical effect of aqueous morpholine by using picosecond TDR

Abstract

The dielectric permittivity parameters, excess characteristic properties, conductivity and thermodynamic properties of binary mixtures morpholine + water have been measured as a function of frequency for various mole fractions. Dielectric dispersion and molecular interactions of morpholine binary mixture depend on concentration and temperature. The results obtained have been used to interpret the nature of solute-solvent interactions. The relaxation process attained in the solution constituents have been related to probable molecular complex formation and its associated behaviours have been discussed. The concentrations have relaxation in a selective frequency region with symmetrical distribution in relaxation times. Additional measurements on aqueous mixtures of morpholine reveal a considerable tendency towards hetero-association. Confirmations of orientated dipole ordering by Kirkwood correlation factors of the mixtures have been assessed. The enthalpy (Δ<em>H</em>), entropy (Δ<em>S</em>) and Gibbs free energy (Δ<em>G</em>) have been calculated for various concentrations and temperature. Thermodynamic parameters depend on concentrations and their relative relaxation processes have been discussed. The interaction and relative dipole ordering are discussed in term of correlation (<em>g</em>^eff) and excess properties (ɛ^E) and (1/τ)^E.