Studies on the Viscosities, Conductances, and Adiabatic Compressibilities of Some Tetraalkylammonium Perchlorates in 2-Methoxyethanol

Electrical conductances, relative viscosities, and apparent molal adiabatic compressibilities of solutions of some symmetrical tetraalkylammonium perchlorates in 2-methoxyethanol (ME) have been reported. The conductance data have been analyzed by the 1978 Fuoss conductance equation and the viscosity data by the Jones–Dole equation for associated electrolytes. The ionic contribution to the limiting equivalent conductance, viscosity B coefficient and other thermodynamic parameters have been determined using the “reference electrolyte” method. The viscosity data show that the tetraalkylammonium ions are poorly solvated and behave as structure-breakers in 2-methoxyethanol. Analysis of the conductance as well as the compressibility data reveals the existence of strong ion-ion interactions in this solvent medium. The compressibility data also indicate the electrostriction of solvent molecules around the tetraethylammonium ion, while for the larger tetraalkylammonium ions they are accommodated inside the space between the coiled alkyl chains attached to the nitrogen atom.