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Determination of chemical-shift tensor orientations in methylene groups by separated-local-field NMR

✍ Scribed by K. Schmidt-Rohr; M. Wilhelm; A. Johansson; H. W. Spiess

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
566 KB
Volume
31
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ^13^C chemical‐shift tensor orientations in the OCH~2~CH~2~O moieties of poly(ethylene oxide) (PEO) and poly(ethylene terephthalate) (PET) were determined by means of ^1^H^13^C separated‐local‐field NMR spectroscopy, and the literature values for the shift tensors in polyethylene (PE) and polyoxymethylene (POM) were improved. An angular resolution of ± 4° was attained on standard equipment with 90° pulse lengths exceeding 4 μs. Relatively high uniformity of the methylene tensor orientations, complying with local molecular symmetry, was found.

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