Spin-lattice relaxation times T 1 and T 1d as well as NMR second moment were employed to study the molecular dynamics of riboflavin (vitamin B 2 ) in the temperature range 55-350 K. The broad and flat T 1 minimum observed at low temperatures is attributed to the motion of two nonequivalent methyl gr
Molecular dynamics in solid pregnenolone studied by 1H spin–lattice relaxation
✍ Scribed by E.R Andrew; S Głowinkowski; J Radomski; E Szcześniak
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 85 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0926-2040
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✦ Synopsis
Spin-lattice relaxation times T in solid pregnenolone have been studied over a wide range of temperatures, from 77 up 1 to 417 K. The dynamic processes arising from C motion of the three methyl substituents are separated, and their activation 3 parameters are determined.
📜 SIMILAR VOLUMES
Proton second moment and spin-lattice relaxation times T and T in solid anhydrous b-estradiol are measured as a 1 1 r function of temperature. The results show that the C reorientation of the single methyl group provides the mechanism 3 dominating relaxation at low temperatures and reveal the existe