13C n.m.r. chemical shielding tensor elements of solid poly(methyl methacrylate)
β Scribed by Hommo T. Edzes
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 402 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0032-3861
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π SIMILAR VOLUMES
## Abstract ^13^C n.m.r. spectra of methyl substituted thianes and thianium cations have been determined. The magnitude of the ^13^C substituent effects of an equatorial methyl group or of a __gem__βdimethyl grouping appear to depend in a systematic way on whether the carbon atom concerned is adjac
Analyses of 13C chemical shielding tensors for powder samples of a-helix-rich poly-L-alanine (pALA) and the mechanically stretched b-sheet pALA Γlms were performed by solid-state two-dimensional spin-echo (2DSE) NMR spectroscopy. From the iterative Γtting of 2DSE spectra with spectrum simulations, i