Characterization of Crystalline and Solution Phases of Diglyme−LiSbF6

Solutions of lithium hexafluroantimonate, LiSbF 6, dissolved in diethylene glycol dimethyl ether (diglyme), CH 3 O(CH 2 CH 2 O) 2 CH 3, are used as a model for high molecular weight poly(ethylene oxide), PEO, complexed with LiSbF 6 . During this work, a 2:1 diglyme:LiSbF 6 crystal was discovered and its structure solved by single-crystal X-ray diffraction techniques. The compound crystallizes in the orthorhombic Pccn space group with Z = 4. In this crystal, the lithium ion is 6-fold coordinated by two diglyme molecules, while the anions are isolated. Raman and FTIR vibrational spectroscopy were used to study both the crystal and a series of diglyme−LiSbF 6 solutions. Similarities in modes sensitive to molecular conformation show that the local conformational structure in the crystal also occurs in diglyme−LiSbF 6 solutions.