Partial Molal Volumes of Asymmetric Iodides of Butyl-Triethyl-Ammonium in Aqueous Solutions at 298,15 K

Abstract

Abstract Density measurements have been made on aqueous solutions of t-BuEt3NI, s-BuEt3NI, i-BuEt3NI, Bu4NI and Et4NI at 298,15 K from 0,01 to 0,05 m. The apparent molal volumes V02 calculated from the V 2,ϕ (m) plots for the salts show a decrease value: n-BuEt3NI > i-BuEt3NI > s-BuEt3NI > t-BuEt3NI. The data analysis may suggest that the cations with the butyl isomers perform two groups: n-BuEt3N+ and i-BuEt3N+ with the highest V 2 0, and t-BuEt3N+ and s-BuEt3N+ similar to Et4N+ one. The peculiarities of the experimental observation may be interpreted as a consequence of the structural effect over the intermolecular forces that affect the solute-water interactions deeply.