The proton dynamics in phenylephrine hydrochloride, isoprenaline hydrochloride and norephedrine hydrochloride have been monitored by measuring the temperature dependence of the 'H spin-lattice relaxation times. The results are interpreted as due to C,-hindered reorientation of the NH, and CH, groups
1H-NMR studies on spin dynamics in molecular nanomagnet V15
β Scribed by K. Kumagai; Y. Fujiyoshi; Y. Furukawa; P. Kogerler
- Book ID
- 113723860
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 210 KB
- Volume
- 294
- Category
- Article
- ISSN
- 0304-8853
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π SIMILAR VOLUMES
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
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
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.