Analyses of spin-lattice relaxation time and second moment measurements of the polycrystalline saccharides methyl a-D-mannopyranoside, methyl fl-D-arabinopyranoside, methyl fl-L-arabinopyranoside and fl-D-allose have revealed, apart from methyl group reorientations in the methyl pyranosides, the jum
Composite motion of molecular groups in solid triethylphosphine oxide as studied by NMR
✍ Scribed by S Jurga; K Jurga; Z Paja̧k
- Publisher
- Elsevier Science
- Year
- 1982
- Weight
- 717 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0022-2364
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📜 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 Zcoman-and dipolar spin-lattice rekxation times and second moments have been measured in polycrystallinc SiH4 at 24 %IHz, between 90 and 3 K. Down to 25 K the classical model for molecular motion appibs; below 25 EC, quantum effects have to be taken into account.