ISSN:
0749-1581
Keywords:
cis-Cyclohexyl-15-crown-5 ether
;
Dynamic stereochemistry
;
13C NMR
;
Sodium or potassium ion complexation
;
Relaxation times
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
13C NMR spectra of cis-cyclohexyl-15-crown-5 ether in the temperature range 298-173 K have been recorded. A single degenerate conformational process, attributed to cyclohexyl ring inversion, has been detected with a barrier of ca 10.3 kcal mol-1. Sodium ion complexation increases this barrier by ca 0.5 kcal mol-1, whereas potassium ion complexation has no measurable effect. Spin-lattice relaxation time results also indicate more effective complexation of sodium ion than potassium ion by the macrocyclic crown ether system.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260250116
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