Abstract
From the molecular theory of dielectric polarization an expression for the average moment is obtained, which formally agrees with the results of the Onsager-Böttcher-Scholte-model. The reaction field and the cavity field are replaced by the results of a molecular statistical theory. A simple approximation is proposed, which is exact at low densities, and in fair agreement with the results of the simulations of the Stockmayer fluid at high densities. The approximation is applied in order to explain the density and temperature dependence of the dielectric permittivity of pure fluids (CH3F, CF3H, CF3C1, H2O, CH3CN), and mixtures with non-polar solvents.
In order to describe the dielectric permittivity of molecules with internal rotational degrees of freedom, such as CO(OR)2, PO(OR)3 (R = CH3, CH2CH3), an equilibrium between the conformeres is assumed. The dipole moment and the energies of the conformeres are calculated by semi-empirical and ab initio methods (MINDO/3, MNDO, STO-3G, 3-21G, 4-31G, 4-31G*). The reaction field stabilizes the conformere with the higher dipole moment, which is the less stable conformere. Reasonable agreement between theoretical and experimental results is found for the variation of the average dipole moment with temperature and concentration.
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Schröer, W., Labrenz, D., Rybarsch, C. (1989). Dielectric Polarization of Fluids Comprising Rigid Dipoles and Molecules with Internal Rotational Degrees of Freedom. In: Dorfmüller, T. (eds) Reactive and Flexible Molecules in Liquids. NATO ASI Series, vol 291. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1043-0_8
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