Studying the Composition of Solvate Complexes of Lithium Perchlorate with Sulfolane via Vacuum Gravimetry

The effect of temperature (40, 50, 60, and 70°C) on the composition of solvate complexes of lithium perchlorate with sulfolane was studied by the method of automated vacuum gravimetry during isothermal evaporation of the solvent. It is found that the composition of the solvate complexes of lithium perchlorate with sulfolane is determined by the temperature of their formation. Raising the temperature lowers the number of sulfolane molecules in the solvate complex. A tetrasolvate of lithium perchlorate with sulfolane forms at 40°C, and disolvates form at 50, 60, and 70°C. The composition of solvate complexes of lithium perchlorate with sulfolane is also confirmed via thermogravimetry. It is assumed that the differences between the compositions of the solvate complexes in the lithium perchlorate–sulfolane system at different temperatures are due to differences in their structure.