## Abstract The NMR spectrum of __cis__β2βbutene partially oriented in a nematic phase has been analysed, and information about the geometry and the indirect spinβspin coupling constants has been obtained. Assuming the barrier of rotation of the methyl groups and other geometrical information from
An NMR structural study of 2-fluoropyridine dissolved in a nematic solvent
β Scribed by E. E. Burnell; A. G. Marshall; D. C. Roe
- Publisher
- John Wiley and Sons
- Year
- 1979
- Tongue
- English
- Weight
- 170 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
The proton NMR spectrum of 2βfluoropyridine partially oriented in a nematic phase has been analyzed, and the geometry of the proton and fluorine skeleton and the order matrix have been determined. The structure does not differ significantly from that of pyridine in a nematic solvent, and the largest positive order parameter axis lies approximately along the Cο£ΏF bond direction in the molecule.
π SIMILAR VOLUMES
i-Endorphin is the largest natural opioid peptide. The knowledge of its bioactive conformation might be very important for the indirect mapping of the active site of opioid receptors. We have studied i-endorphin in a variety of solution conditions with the goal of testing the intrinsic tendency of i
Multinuclear NMR spectroscopy has been used to study water bound to subtilisin Carlsberg suspended in tetrahydrofuran (THF), with the water itself employed as a probe of the hydration layer's physicochemical and dynamic characteristics. The presence of the enzyme did not affect the intensity, chemic
Dynorphin A, the endogenous agonist for the s opioid receptor, has been studied by NMR spectroscopy in methanol, acetonitrile, DMSO and in mixtures of hexafluoroacetone/water and DMSO/water. NMR data in the DMSO/water cryomixture at 278 K are consistent with a conformer in which the N-terminal part,
H NMR spectra of la,2a,3e,4e,5e,6a-hexachlorocyclohexane (y-BHC) have been measured in a nematic solution of ZLI2081 at low temperatures to prevent exchange broadening. The spectra were analysed and direct couplings determined. The six-membered ring is most favourably oriented parallel to the solven