Capillary zone electrophoretic studies of ion association between inorganic anions and tetraalkylammonium ions in aqueous–dioxane media

Abstract

Ion association between inorganic anions and symmetrical tetraalkylammonium ions, R 4 N + (R = Me, Et, Pr, n-Bu, n-Am, and 2-methyl butyl {isoamyl=iAm}) was investigated using ordinary silica capillary by capillary zone electrophoresis. An improved version of the Williams-Vigh method was used for the first time to measure the mobilities of the inorganic anions. Plots of log K ass against log dielectric constant in various media, revealed a smaller change in K ass compared to dielectric constant. These plots suggest that the Bjerrum's equation is inadequate in accounting for the associations of ions in a CZE setup.

From Molecules to Ions - Where do Modern Ionic Liquids Belong?

“…In addition, the large dielectric constant of water ( r (T) = 76.2, T = 303 K) favours the separation of the ions formed, as manifest in the conductivities found. This effect is in accord with the generally observed inverse relationship that exists between the association/stability constant and the dielectric constant at play in aqueous (1) and mixed aqueous organic media (2). However, hydrogen acetate is an example of several substances that are not completely ionized in aqueous solution [the maximum conductivity occurs for a concentration of ~9 mol % (3)].…”

Specific coordination phenomena of alkaline earth metal ions with aromatic sulfonate ions in alcohols and binary solvents of acetonitrile–alcohols

“…Recently, the coordination reactions of the alkali metal and alkaline earth metal ions have been extensively investigated, due to their widespread application in the industry, their importance in maintaining the ionic equilibrium of the human body and especially their relevance in pharmaceutics [4]. The mixtures of aqueous-organic or organic-organic mixed solvents find a broad application in industries such as the manufacture of paints to detergents and deodorants [5] and enable the variation of properties for studying the ion-ion and ion-solvent interactions [6].…”