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- W2017293972 abstract "Dielectric relaxation measurements and for infra-red spectra relative to the same para-dimethoxybenzene/tetrachloroethylene solution have been concomitantly analysed with 13C N.M.R. (T 1 and N.O.E.) relaxation data, in order to study the intramolecular dynamics of the methoxy and methyl group internal motions. From a direct comparison between the microscopic dipolar (τμ) and N.M.R. (τC NMR) correlation times, it can be shown that the methoxy group internal rotation significantly contributes to the dielectric relaxation process. A quantitative analysis in terms of a ‘Chemical Relaxation Process’ permitted an estimation of both the kinetic constant k cis→trans of the dielectrically ‘active’ cis/trans isomerism of the para-dimethoxybenzene molecule, and of the jumping rate of the methyl group from any of its three equivalent positions. The methoxy-torsional modes for the deuterated para-(CD3O)2ϕ and normal species have been assigned to features respectively observed at 82 and 92 cm-1 in the far infra-red spectra of these compounds. Also a speculative assignment of the methyl torsions has been investigated. The coherence of the different results has been carefully discussed." @default.
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- W2017293972 date "1975-10-01" @default.
- W2017293972 modified "2023-10-16" @default.
- W2017293972 title "Re-investigation of the methyl and methoxy group hindered rotations in<i>p</i>-dimethoxybenzene, by comparison of dielectric and far infra-red spectra with<sup>13</sup>C N.M.R. relaxation data" @default.
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- W2017293972 doi "https://doi.org/10.1080/00268977500102521" @default.
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