A study on the solvation phenomena of some sodium salts in 1,2-dimethoxyethane from conductance, viscosity, ultrasonic velocity, and FT-Raman spectral measurements

Electrical conductances, viscosity, apparent molar adiabatic compressibilit ies and Fourier transform (FT)Raman spectra of sodium perchlorate (NaClO4), sodium tetrafluoroborate (NaBF4), and sodium tetraphenylborate (NaBPh4) in 1,2-dimethoxyethane have been-reported. All these electrolytes are found t o be strongly associated in this solvent medium. Both ion pairs and triple ions are found to be formed though an overwhelming fraction of each of thes e electrolytes exists as ion pairs. For NaClO4, the solvent-separated ion p airs predominate over the contact species. For NaBF4 and NaBPh4, on the oth er hand, the contact species are also formed in significant amounts. FT-Ram an studies indicate the presence of "spectroscopically free" ClO4-, BF4-, a nd BPh4- ions in 1,2-dimethoxyethane solution. The ClO4- ion is found to be significantly solvated,; whereas BF4- and BPh4- ions are poorly solvated i n DME solution.