Apparent and Partial Molar Volumes of Some Symmetrical Tetraalkylammonium Perchlorates in 2-Methoxyethanol at 25, 35, and 45 °C

The apparent and partial molar volumes (φv) of six symmetrical tetraalkylammonium perchlorates (Me4NClO4 to Hex4NClO4) have been determined in 2-methoxyethanol at 25, 35, and 45 °C. The apparent molar volumes were extrapolated to zero concentration to obtain limiting values at infinite dilution. Ionic limiting partial molar volumes have been estimated using the extrapolation method. The analysis of the data shows that the tetraalkylammonium ions are scarcely solvated and that strong ion–ion interaction exists between the oppositely charged ions in this medium. The temperature dependence of the limiting partial molar volumes have been explained on the basis of ion–solvent interactions.