APPARENT AND PARTIAL MOLAL VOLUMES OF SELECTED SYMMETRICAL TETRAALKYLAMMONIUM BROMIDES IN 2-METHOXY-1-ETHANOL AT 25-DEGREES-C

The apparent and partial molal volumes of six symmetrical tetraalylammonium bromides, R4NBr (R = C2H5 to C7H15) in 2-methoxy-1-ethanol (ME) have been determined at 25 degrees-C. The limiting apparent molal volumes (phi-degrees v) and the experimental slopes (S* v) have been interpreted in terms of ion-solvent and ion-ion interactions, respectively. Use has been made of the nonthermodynamic, so-called extrapolation method to split the limiting apparent molal volumes into ionic contributions. The V-degrees-BARR4NX values in 2-methoxy-1-ethanol are found to be almost similar to those in other organic solvents examined and differ greatly from the values in water and heavy water solutions. The ion-solvent interaction effect, as estimated by the combination of the viscosity B(ion) values with V-degrees-Barion values, indicates that these ions may be classified as "structure breakers" in this solvent medium.