Abstract

Measurements of surface potential (Δ V) and surface tension (Δσ) of aqueous solutions of acetic acid, chloro-, dichloro-, trichloroacetic acid, and alcohols (methanol, ethanol, 2,2,2-trifluoroethanol) were used for the determination of effective dipole moments (μ̄) and their separate components. For this purpose, the Helmholtz equation (in the form presented by Demchak and Fort (5)) have been applied. The contributions from the reorientated water molecules ( μ ̄ 1/ϵ 1 ), and from hydrophilic ( μ ̄ φ- COOH , μ ̄ φ- OH ) and hydrophobic ( μ ̄ φ- CH 3 , μ ̄ φ- CH 2Cl , μ ̄ φ- CHCl 2 , μ ̄ φ- CF 3 ) groups and the local dielectric permittivity in the vicinity of these groups were calculated.

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