Ion association and solvent interaction-conductance of 1-ethyl-4-cyano pyridinium iodide in aqueous-binary mixtures containing acetone and 1,4-dioxane at different temperatures

Abstract

Conductance of 1-ethyl-4-cyanopyridinium iodide has been measured in the concentration range (7.8-19.1) × 10^-4 mol dm^-3 in binary solvent mixtures of water and aprotic cosolvents (acetone and 1,4-dioxane) at different temperatures (293-308 K). The conductance data in all cases have been analysed by the Shedlovsky equation to obtain Ʌ₀ and <i>K</i>_A<i>.</i>Based on the composition dependence of Walden product, the influence of the mixed solvent composition on the solvation of ions has been discussed. The association constants, <i>K</i>_A,<i> </i>are used to get information about the influence of solvent composition on the various equilibria present in the solution. Thermodynamic parameter, Δ<i>H</i>⁰<i> </i>as a function of solvent composition has also been determined.