Ion-molecule Interaction in Solutions of Lithium Tetrafluoroborate in Propylene Carbonate: an FTIR Vibrational Spectroscopic Study

FTIR (Fourier transformed infrared) spectra have been collected and analyzed for solutions of lithium tetrafluoroborate in propylene carbonate (PC). It has been shown that the carbonyl stretch, symmetric ring deformation stretch and ring deformation stretch bands for PC is very sensitive to the interaction between Li + and the solvent molecule. Their half-peak breadth increases and bands split with the addition of LiBF 4 , indicating that a strong interaction exists between Li + and PC molecule mainly through the oxygen group of C=O and ring position of PC.