Molecular motion in crown ethers. Application of 13 C and 2 H NMR to the study of 4-carboxybenzo-24-crown-8 ether and its KNCS complex in solution and in the solid phase
β Scribed by Buchanan, G.W.; Moghimi, A.; Ratcliffe, C.I.
- Book ID
- 121352301
- Publisher
- NRC Research Press
- Year
- 1996
- Tongue
- French
- Weight
- 556 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0008-4042
- DOI
- 10.1139/v96-161
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π SIMILAR VOLUMES
The 'H and I3C NMR spectra of a series of structurally related crown ethers have been recorded, and the signals assigned by means of 'H/I3C heteronuclear correlated and 'H/'H homonuclear NOE difference spectroscopy. The NMR parameters so extracted have been used to discuss the preferred, rapidly int
Two conformations of the cis-cyclohexano-8-crown-3 molecule were detected at 185 K. From relative 13 C NMR peak area measurements, the conformation with the O-CH 2 -O unit equatorial was found to be favoured by 4.4 Ε‘ 0.4 kJ mol 1 . In the spectrum of the minor conformer at low temperature, a 9.6 ppm