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- W2030909645 abstract "The conformation of poly(ethylene oxide), PEO, in molecular complexes with resorcinol (RES) and p-nitrophenol (PNP) was investigated by solid-state NMR. The two-dimensional double-quantum NMR spectrum shows that all OC−CO bonds in the PEO/RES molecular complex are gauche with ψ = 74 ± 9° and a torsion angle distribution with a width σ < 10°. The spectra of the PEO/PNP complex, however, show that 33 ± 8% of the OC−CO bonds are trans with σ < 7°. The fraction of trans bonds was also confirmed by 13C CODEX experiments. The gauche torsion angle of 70 ± 9° differs significantly from the value of 60° assumed in some models. Magic-angle-spinning 13C INADEQUATE NMR, the CODEX data, and 2H−13C REDOR NMR allowed assignment of the two observed PEO 13C NMR peaks. Both carbons on the trans bond, characterized by minimal dipolar broadening in the INADEQUATE spectrum, have chemical shifts of 69.2 ppm. The downfield gauche carbon at 71.4 ppm is 3.2 ± 0.2 Å from the d-PNP OD deuteron, while the upfield 69.8 ppm gauche carbon is estimated to be at a 1.13 ± 0.06 times larger distance, or 3.6 ± 0.3 Å, from the deuteron." @default.
- W2030909645 created "2016-06-24" @default.
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- W2030909645 date "2000-03-31" @default.
- W2030909645 modified "2023-10-14" @default.
- W2030909645 title "Conformation of Poly(ethylene oxide)−Hydroxybenzene Molecular Complexes Studied by Solid-State NMR" @default.
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- W2030909645 doi "https://doi.org/10.1021/ma992087i" @default.
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