Ion-Pair and Triple-Ion Formation by Some Tetraalkylammonium Iodides in Binary Mixtures of 1,4-Dioxane+Tetrahydrofuran

摘要

Electrical conductances of tetraalkylammonium iodides,R4NI(R=pentyl to heptyl)have been measured at 298.15 K in low-permittivity mixtures of 1,4-dioxane(epsilon=2.21)and tetrahydrofuran(epsilon=7.58).Minima in the conductometric curves(A versus were observed for electrolyte concentrations dependent upon both the electrolyte and the binary solvent mixture.The conductance data have been analyzed by the Fuoss-Kraus theory of triple ions.A numerical evaluation of ion-pair and triple-ion formation constants(K_p and K_T)was made,and the results have been discussed in terms of a molecular scale model.