Abstract
AbstractSolvation and association interactions in solutions of lithium tetrafluoroborate/4‐ethoxymethyl‐ethylene carbonate (EEC) have been studied as a function of concentration of lithium tetrafluoroborate by infrared and Raman spectroscopy. Strong interactions between Li+ and solvent molecules or BF4− anions were observed. Splitting of the ring symmetric angle deformation band, the carbonyl stretching band and the skeletal ring vibrational band suggests that the interaction between Li+ ions and EEC molecules take place via the oxygen atom on the carbonyl group. The apparent solvation numbers of Li+, varying from 4.32 to 1.26 with increasing the solution concentrations, were deduced. Band‐fitting to the B–F stretching band of BF4− anion permits detailed assess of ion pairing. The spectroscopically free BF4− anion, contact ion pair and contact ion dimmers coexist in concentrated solutions.
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