Correlation of acid-base properties of solutes with the polarity parameters and other solvatochromic parameters of dioxane-water mixtures

摘要: Abstract The behaviour of water-dioxane mixtures as solvents is studied paying special attention to the correlations which may exist among solvatochromic parameters these mixtures, well some and acid-base properties model solutes (whose acidity constants are determined). Values polarity parameter π . , proposed by Kamlet Taft, determined from measurements shifts in λ max 2-nitroanisole, 4-nitroanisole 4-ethylnitrobenzene, reference dyes for amphiprotic solvents. values with bulk different microscopic working established. Acid dissociation propionic acid, chosen a aliphatic carboxylic acids, salicylic both aromatic phenolic hydroxylic e.m.f. data (at constant electrolyte concentration 0.2 M at 25 °C). solvent composition range comprises 10 70% dioxane (vol./vol.). Correlations obtained acid can be useful helping explain variation character when modified.