Influence of Solute-Solvent Interaction on Acid Strength of Some Substituted Phenols in Ethanol-Water Media

ALTUN Y., Koseoglu F.

JOURNAL OF SOLUTION CHEMISTRY, cilt.42, sa.8, ss.1691-1705, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 42 Sayı: 8
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1007/s10953-013-0056-0
  • Dergi Adı: JOURNAL OF SOLUTION CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1691-1705
  • Anahtar Kelimeler: Solvent effects, Kamlet-Taft equation, Substituent effects, Linear free energy relationship, SOLVATION ENERGY RELATIONSHIPS, PERFORMANCE LIQUID-CHROMATOGRAPHY, DISSOCIATION-CONSTANTS, SOLVATOCHROMIC PARAMETERS, PROTONATION EQUILIBRIA, NONAQUEOUS SOLVENTS, IONIZABLE COMPOUNDS, PI-STAR, MIXTURES, METHANOL
  • Gazi Üniversitesi Adresli: Evet

Özet

The solute-solvent interactions of some phenol derivatives were investigated potentiometrically in 0-60 % (v/v) ethanol-water mixtures. The acidity constants values were correlated with either macroscopic parameters such as molar fraction, permittivity and the solvating ability or microscopic parameters, such as the Kamlet-Taft solvatochromic parameters. Moreover, it is demonstrated that the pK (a) values in any ethanol-water mixtures are linearly related to the pK (a) values of the phenols in pure water. The slope and intercept parameters of the linear correlations are related with the mole fraction of ethanol. These equations permit accurate calculation of the pK (a) values of the studied phenols at any ethanol-water composition.