Vibrational spectroscopic and conductivity data for complexes of NaBF4 and NaBH4 with poly(ethylene oxide) indicate that extensive contact ion pairing occurs in the NaBH4 complex but not in the NaBF4 complex. As a result the ionic conductivity is considerably lower in the NaBH4 complex due to trapping of the mobile sodium cations by the anion. Conductivity studies on mixed anion complexes of poly(ethylene oxide) containing both ion-pairing (BH4−) and non-ion-pairing (BF4−) anions suggest that cation transport in these systems is not limited by motion through the polymer helical channels in which the cation is thought to reside. Conduction between helical chains appears to be a dominant process.
ASJC Scopus subject areas
- Colloid and Surface Chemistry