## Abstract The proton NMR spectrum of azulene has been investigated in the nematic phase of a liquid crystal. Spectral analysis provided the direct dipole‐dipole coupling constants which were used to derive the structural information. It was found that the relative proton‐proton distances in the 7
1H,13C and 199Hg NMR study on the spin-spin coupling constants and Rα-structure of CF3HgCH3 in isotropic and nematic phases
✍ Scribed by J. Jokissri; J. Kuonanoja
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 594 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0022-2860
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📜 SIMILAR VOLUMES
## Abstract The magnitude of the NMR spin‐spin coupling constant, ^3^__J__(CH), between a vicinal ^13^C–^1^H pair depends, __inter alia__, on the value of the torsion angle Φ~CH~(^13^CCCH) and is influenced by the presence of an electronegative substituent located on the coupling ^13^C nucleus.
## Abstract The signs of all ^13^C^19^F and ^1^H–^19^F coupling constants in fluorobenzene, some substituted derivatives, and in 2‐fluoropyridine have been related using single‐frequency ^13^C{^1^H} double resonance techniques. All ^13^C^19^F couplings in these compounds are shown to be positive
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