Polycrystalline progesterone (4-pregnene-3,20-dione, C21H30O2) has been investigated by proton NMR methods between 80 and 350 K. A reduction in dipolar second moment is ascribed to methyl group reorientation. Minima in the spin-lattice relaxation time found in measurements at five frequencies from 7
A proton NMR study of relaxation and dynamics in polycrystalline insulin
โ Scribed by E.R. Andrew; D.J. Bryant; E.M. Cashell; Q.A. Meng
- Book ID
- 115912004
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 357 KB
- Volume
- 126
- Category
- Article
- ISSN
- 0014-5793
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The 2H spin-lattice relaxation times T1Z and T1Q of the -ND+3 group in polycrystalline L-alanine were measured over the temperature ranges 250-425 K and 300-425, respectively. The relaxation data were fitted to analytical expressions for three-fold reorientation, giving a correlation time tau(c) = 1