Vibrational spectroscopic studies on ion solvation of lithium perchlorate in propylene carbonate+ N, N-dimethylformamide mixtures

Abstract

The infrared (IR) and Raman spectra are reported for solutions of lithium perchlorate in propylene carbonate (PC), N, N-dimethylformamide (DMF) and PC+DMF mixtures. The band splittings of symmetric ring deformation for PC and OCN deformation for DMF suggest that there is a strong interaction between lithium cations and solvent molecules. The solvent molecules have been assigned to two types, the free and complexed molecules. By a comparison of the intensity for the corresponding bands, it has been concluded that Li + cations are preferentially solvated by DMF molecules in the LiClO 4/PC–DMF solutions. This has been explained by the difference in values of donor number.