Solid state NMR study of intercalate complexes of poly(ethylene oxide) and small molecules

Abstract

AbstractFrom solid state NMR spectra, a lower shielding of poly(ethylene oxide) (PEO) protons, in contrast to higher shielding of PEO carbons, has been found for PEO/hydroxybenzene and PEO/LiCF3SO3 complexes in comparison with neat PEO. The same PEO chemical shifts were found both for crystalline and amorphous phase of PEO/LiCF3SO3 polymer electrolyte, confirming the same interaction in both phases. Measurements of 2D 1H CRAMPS exchange NMR spectra have been used to characterize proton distances in complexes of PEO and benzene derivatives. A close contact (∼ 0.3 nm) between aromatic and PEO protons was detected in some cases. From the measurements of the cross polarization 1H → 13C, using Lee‐Goldburg irradiation of 1H nuclei, the distance between LiCF3SO3 carbon and the nearest PEO protons in the PEO/LiCF3SO3 complex was determined.