Determination of chemical‐shift tensor orientations in methylene groups by separated‐local‐field NMR | Zendy

SchmidtRohr K. | Zendy; Wilhelm M. | Zendy; Johansson A. | Zendy; Spiess H. W. | Zendy

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

Author(s) -

SchmidtRohr K.,

Wilhelm M.,

Johansson A.,

Spiess H. W.

Publication year - 1993

Publication title -

magnetic resonance in chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.483

H-Index - 72

eISSN - 1097-458X

pISSN - 0749-1581

DOI - 10.1002/mrc.1260310408

Subject(s) - methylene , chemistry , ethylene , polyoxymethylene , nuclear magnetic resonance spectroscopy , tensor (intrinsic definition) , spectroscopy , ethylene oxide , local symmetry , nuclear magnetic resonance , analytical chemistry (journal) , stereochemistry , organic chemistry , polymer , geometry , physics , mathematics , quantum mechanics , copolymer , catalysis

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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