ISSN:
0749-1581
Schlagwort(e):
1H/13C NMR
;
2D and 1D NOE difference spectroscopy
;
Crown ethers
;
Conformations in solution
;
Intramolecular flexibility
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
The 1H and 13C NMR spectra of a series of structurally related crown ethers have been recorded, and the signals assigned by means of 1H/13C heteronuclear correlated and 1H/1H homonuclear NOE difference spectroscopy. The NMR parameters so extracted have been used to discuss the preferred, rapidly interconverting solution conformations of the studied species. The high-field shifts in the 13C NMR spectra, within the so-called γ-fragments, and also the 1H/1H homonuclear NOEs, are particularly informative in this respect. The T1 relaxation times of the 13C atoms show segmental motions within the ether segments and suggest different intramolecular flexibilities for the studied compounds.
Zusätzliches Material:
2 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/mrc.1260260508
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