Preferential solvation of N-ethyl-4-cyanopyridinium iodide and 2,6-diphenyl-4(2,4,6-triphenyl-1-pyridino)phenolate [Reichardt's ET(30) dye] has been studied in ethanol + tetrahydrofuran, ethanol + acetonitrile and
acetonitrile + tetrahydrofuran binary mixtures as a function of temperature and composition of mixed binary
solvents. It has been found that besides solute−solvent interaction, solvent−solvent interaction plays an
important role in determining the solvation characteristics.
Preferential solvation of N-ethyl-4-cyanopyridinium iodide and N-ethylpyrazinium iodide in binary solvent mixtures of cyclic ethers (1,4-dioxane and tetrahydrofuran) and cosolvents (water, monohydroxy alkanols and acetone) has been studied by monitoring the solvatochromic charge-transfer band of the solute. Protic solvents are preferred near the solute except in regions rich in water, methanol or ethanol where molecules of cyclic ethers are preferred over the protic component. This effect has been explained in terms of self-association of the protic solvent through hydrogen bonding. No preferential solvation of N-ethyl-4cyanopyridinium iodide has been found to occur in 1,4-dioxane-propan-l-ol, 1,4-dioxane-propan-2-0l and 1,4-dioxane-tert-butyl alcohol. This has been explained in terms of specific solute-solvent interactions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.