Abstract
Solvation interaction and ion association in solutions of lithium perchlorate/sulfolane have been studied by using infrared and Raman spectra as a function of concentration of lithium perchlorate. The band changes of antisymmetric OSO stretch, antisymmetric CSC stretch, −SO 2 wag and twist suggest that there is an interaction between Li + and sulfolane molecules, and the site of solvation is the oxygen atom of –SO 2 group. The molecular orbital calculation supports this suggestion. On the other hand, the apparent solvation number was calculated, and the band fitting for the ClO 4 − band reveals the presence of contact ion pair, solvent separated ion pair and free ClO 4 − anion in the concentrated solutions.
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