Solute–solvent and solvent–solvent interactions in binary solvent mixtures. Part 3. The E_T(30) polarity of binary mixtures of hydroxylic solvents

Abstract

II rn 3 7 i Solute-solvent and solvent-solvent interactions in binary solvent mixtures. Part 3. The ET(30) polarity of binary mixtures of hydroxylic solvents

Thermal decomposition of cyclic organic peroxides in pure solvents and binary solvent mixtures

“…The k exp value in the mixture is nearly 6% higher than the rate constant value in pure 1-PrOH. This difference is close to the experimental error and makes it possible to neglect a preferential solvation of the 2a molecule by the intersolvent species proposed by Ortega et al in 1996 [2]. In general, the peroxide molecules decompose faster in a mixture containing 1-PrOH than in pure acetone.…”

“…The reactivity rises up to a value close to that obtained in the pure alcohol when the 1-propanol mole fraction in the binary solvent mixtures is 0.7. This solvent system was considered as a synergetic mixture [2] • C was carried out in pure acetone, pure 1-propanol, and in their binary mixtures (Table III). The k exp values increase in binary mixtures containing 1-propanol up to the highest value in pure alcohol (k prop /k acet = 3.23).…”

“…The mixed solvents chosen were representative of the types for mixtures of aprotic nonpolar/aprotic mildly polar (toluene/acetone) and protic/aprotic (1-propanol/acetone) solvents. The last of these mixtures has been considered as a synergetic binary solvent system [2], where the interaction through hydrogen bonds between the solvents generates a complex with a solvent polarity index value [E T (30)] [3] higher than those of the two pure solvents. In that complex, acetone operates as a dipolar hydrogen-bond acceptor and 1-propanol as a hydrogen-bond donor.…”

Solvatochromism of dyes. Part III. Solvatochromism of merocyanines in some binary mixtures of solvents.SA-SAB-SB, a new model of solvatochromism

“…By means of the application of a five-parameter model [two preferential solvations and three E T (30) parameters] a good quantitative description of over 70 binary solvent mixtures was possible. 18 In this paper, we present a description of the solvatochromism in binary solvent systems from the position of the solute, i.e. solvatochromic indicator, using our original model.…”

“…The Skwierzyński-Connors model was tested by Rosés and co-workers [16][17][18] using over 100 binary solvent mixtures, including mixtures showing synergetic properties (mixtures of trialkyl phosphates, dimethyl sulfoxide, acetonitrile and nitromethane with chloroform, alcohols and water). With the last-mentioned mixtures, it was observed that increasing the temperature decreases the intensity of the synergetic effect, 17 indicating the thermal decomposition of the relevant solvent-solvent complexes.…”