Solvatochromism, thermochromism, piezochromism, halochromism, and chiro-solvatochromism of pyridinium N-phenoxide betaine dyes

Pyridinium N-phenolate betaine dyes.

Study of retention in reversed-phase liquid chromatography using linear solvation energy relationships. I. The stationary phase

The influence of solute–solvent and solvent–solvent interactions on the preferential solvation of solvatochromic indicators in binary solvent mixtures of Bipolar hydrogen bond acceptors has been studied. Several equations based on solvent exchange models that relate the transition energy of the Dimroth–Reichardt ET(30) indicator with the solvent composition are derived and compared. The models tested assume that the two solvents mixed interact to form a common structure with an ET(30) value not always intermediate between those of the solvents mixed. The solvatochromic indicator can be preferentially solvated by any of the solvents mixed or by the mixed solvent obtained. The parameters obtained explain the strong synergism observed for some of the mixtures with strong hydrogen bond donors (alcohols and chloroform).

Solute–solvent and solvent–solvent interactions in binary solvent mixtures. Part 1. A comparison of several preferential solvation models for describing ET(30) polarity of bipolar hydrogen bond acceptor-cosolvent mixtures

Etude sur une serie de 26 composes aromatiques. Interpretation des resultats par les energies de formation de cavites et de liaisons hydrogene

Study of temperature and mobile-phase effects in reversed-phase high-performance liquid chromatography by the use of the solvatochromic comparison method.

Empirical parameters of lewis acidity and basicity for aqueous binary solvent mixtures

The Kamlet and Taft basicity parameters βKT, for twelve mixtures of organic solvents with water are reported. Also the data for water-butanols (n-BuOH. i-BuOH. and s-BuOH) and alcohols (MeOH, EtOH. n-PrOH. and i-PrOH)-n-hexane mixtures are given. It was found that in the case of mixtures of 1.4-dioxane. acetone, tetrahydrofuran. dimethylsulfoxide. and acetonitrile with water, the basicity parameters of the mixture are higher than that of pure solvents in a region of smaller concentrations of water.These results, together with earlier reported results for THF and Et₂O mixtures with MeOH are discussed in terms of breaking off the structure of the more structurized solvent (water and MeOH). All these mixtures, except the W-THF mixture, show the excess thermodynamic func­tions (ΔHᴱ and ΔSʰ) analogous to MeOH-CCl₄ mixtures, where depolymerization of MeOH clusters was postulated.Relativity of different basicity scales in respect to the acidic probe molecule is also shortly discussed

Urszula Zielkowska

Papers

Empirical parameters of lewis acidity and basicity for aqueous binary solvent mixtures

Empirical Parameters of Lewis Basicity of Binary Solvent Mixtures, Part II Mixtures with Water