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In order to determine the conformation of poly(ethylene oxide) (PEO), 13 C satellite spectra of PEO, 1,2‐dimethoxyethane (DME), and dioxane were measured at various temperatures in various solvents, and analyzed. Relations between the coupling constants were derived from the linearity between the parameters N = J AB + J A′B and L = J A′B in AA′BB′ spectra of PEO and DME. The vicinal coupling constants for the individual rotational isomers were obtained from the above relations and the temperature dependences of N and L and the enthalpy differences were calculated in each solvent. The gauche rotamer is more stable than the trans isomer by 250–500 cal/mole in all cases examined.
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Matsuzaki et al. (1974) studied this question.
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