The infrared absorption spectrum of poly(ethylene oxide)−LiCF 3 SO 3 yields two broad, distinct Li−O stretching bands (“cage” modes) between 395 and 440 cm -1 . An analysis of the integrated band intensities as a function of salt concentration demonstrates that each mode originates in the motion of all lithium ions in all potential energy environments, rather than each band being due to a distinct ionic species. Multiple band structure is observed in several low-frequency, intramolecular CF 3 SO 3 - modes. These data are compared with the extensively studied CF 3 symmetric deformation mode in order to identify the ionic species associated with each band component.
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Seneviratne et al. (2002) studied this question.
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