The two-dimensional powder pattern for isotactic polypropylene in a sample rotating at an off-magic angle has been measured and the chemical shift principal values and principal axis directions for each of the CH, CH, and CH, carbons, together with their C-H bond lengths, have been determined. KEY W
Determination of 13C chemical shift tensor orientations in cis- and trans-polyacetylene by measurements of two-dimensional NMR powder patterns in rotating solids
β Scribed by Toshihito Nakai; Takehiko Terao; Hideki Shirakawa
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 381 KB
- Volume
- 145
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
The orientations of the 13C chemical shift tensors in undoped cis-and tram-polyacetylene have been determined from the chemical shift-dipolar two-dimensional powder patterns observed in rotating samples.
π SIMILAR VOLUMES
The spinning sidebands observed in the 13 C MAS NMR spectra (Fig. 1a), oriented in a nematic phase and in the solid state of cis,cis-mucononitrile oriented in liquid-crystalline media and of are presented. As a consequence of the carbon-13 chemicalthe neat sample in the solid state are studied. Ther
We demonstrate a dipolar-chemical shift correlation technique for sign-sensitive determination of the torsion angle in solid peptides and proteins under magic-angle spinning. The indirect dimension of the experiment is obtained by separate but synchronous evolution of the magnetization under the 15