Solvation studies of some tailor made alpha-N,N-dimethylaminostyryl-N-alkyl pyridinium dyes in binary solvent mixtures containing alcohols, hexane, 1,4-dioxane, DCM and acetone

摘要

Solvation of some alpha-N,N-dimethylaminostyiyl-N-alkyl pyridinium dyes has been studied in binary solvent mixtures of alcohol-hexane, alcohol-1,4-dioxane, acetone-hexane, acetone-1,4-dioxane, DCM-hexane, DCM-1,4-dioxane and 1,4-dioxane-hexane to analyze the preferential solvation of any of the solvent in the binary mixture. Due to solvent-solvent interaction, hyper and hypo-polarity in the solvent complex is observed, which is reflected from the bathochromic and hypsochromic shifts of the absorption maxima of the dye molecules. The solvent cage around the dye is influenced by polar-polar and apolar-apolar interactions as well as a proper balance between both the types of interactions. (C) 2015 Elsevier B.V. All rights reserved.