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1 Polish Journal of Chemistry

1 2001

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Aromatic Solvent Effect on Polarity and Proton-Transfer Equilibrium in Phenol-Triethylamine Systems

Pawełka Z., Kuc T.

Polish Journal of Chemistry

2001

Vol. 75, nr 6

845-855

Dipole moments of hydrogen-bonded complexes of 4-nitrophenol-triethylamine and 2,4,6-trichlorophenol-triethylamine have been determined in various aromatic solvents. On this basis, the Gibbs energy _GPT of the proton-transfer equilibrium has been estimated. The aromatic solvent effect on the proton transfer has been discussed in terms of two solvation contributions, arising from a local complex-aromatic molecules interaction and a long-range dielectric effect. The microstructure of the solvent near a complex has been taken into account, utilizing a dielectric model of two spherical solvent layers. The crucial effect of the size of the aromatic solvent molecules on _GPT has been simulated by variation of the thickness of the first solvation layer.