Abstract
The dimerization constant of pinacyanol (PC) dye in aqueous and mixed aqueous–organic solvent media with different hydrophobic character has been determined spectrophotometrically at 303.15K. The organic solvents chosen for the study include ethylene glycol, 2-methoxy ethanol, dioxane, tetrahydrofuran, ethylamine, diethylamine, triethylamine, ethanolamine, diethanolamine, and triethanolamine. Though presence of the organic solvents reduced the dye's tendency to form aggregates, presence of equilibrium between the monomer and dimer species of the dye was established in mixed aqueous–organic media containing 5% organic solvent by volume and the dimerization constant, KD, of the dye in the mixed media has been computed. A comparison of KD among the mixed media containing 5% organic solvent showed that dimers of the dye are preferentially formed with increasing hydrophobic groups in the ethylene glycol or amines under study despite decreasing dielectric constant of the mixed media. The results would suggest that the dye aggregates are better stabilized in more hydrophobic environment perhaps through enhanced hydrophobic effects.
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