lithium-perchlorate and ethyl-carbonate

FTIR spectra have been recorded and analyzed for solutions of lithium perchlorate in propylene carbonate (PC), diethyl carbonate (DEC), and PC + DEC mixtures. It has been shown that the carbonyl stretch bands for PC and DEC are very sensitive to the interaction between Li+ and the solvent molecules. They split with addition of LiClO4, indicating a strong interaction of Li+ with PC and DEC through the oxygen group of PC and both oxygen and ether oxygen atoms of DEC. In conjunction with molecular orbital calculation, the optimized geometries of solvation are given. In addition, solvent separated ion pairs and contact ion pairs were observed in LiClO4/DEC solutions, and no preferential solvation of Li+ in LiClO4/PC + DEC solutions were detected.

Topics: Carbonates; Diethyl Pyrocarbonate; Lithium Compounds; Molecular Conformation; Molecular Structure; Perchlorates; Propane; Solutions; Solvents; Spectrophotometry, Infrared

The infrared (IR) spectra of propylene carbonate (PC), gamma-butyrolactone (BL) and diethyl carbonate (DEC) in the presence of LiClO4 have been investigated. It is shown that the interactions between Li+ and these solvents occur on the oxygen atoms of the carbonyl of solvent molecules. On the other hand, spectral curve fitting for band shape of perchlorate anion shows the presence of ion association in these solutions.

Topics: 4-Butyrolactone; Diethyl Pyrocarbonate; Lithium; Lithium Compounds; Organic Chemicals; Perchlorates; Propane; Solvents; Spectrophotometry, Infrared