## Abstract Proton and phosphorus magnetic resonance spectra of substituted methylphosphonic acids have been determined as a function of pH. A method has been developed for measuring the ^31^P shift indirectly by optimal heteronuclear decoupling of the ^1^H spectra of samples and standards. Control
1H and 31P NMR spectra of the phenyl ester of dichlorophosphoric acid in a nematic phase
β Scribed by J. Hansen; J. P. Jacobsen
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 375 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
The ^1^H and ^31^P NMR spectra of the phenyl ester of dichlorophosphoric acid dissolved in Merck nematic phase IV have been recorded and analysed. The values of the dipole dipole couplings have been discussed in terms of several different geometric models. Nonβplanarity of Cβ1, O, P and the phenyl ring must be assumed in order to account for the results; a twist angle of 49Β° was found.
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## Abstract ^1^H multiple quantum (MQ) NMR spectra of toluene and __p__βbromotoluene, partially aligned in a liquid crystalline solvent, were acquired using gradientβassisted methods. The MQ spectra were analysed to give the dipolar couplings (__D__~__ij__~) and these were used to determine the mol
## Abstract ^1^H and ^13^C NMR spectra of symmetrically substituted cyclotriphosphazenes exhibit secondβorder effects. The influence of the ^31^P,^31^P coupling constants between ring phosphorus atoms on these effects was studied. Some values of this coupling constant between phosphorus bearing ide