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- W1987283921 abstract "Fourier transforms of the noise-decoupled, natural abundance 13C nmr free induction decays of the cyclic antibiotic valinomycin and its potassium-ion complex have been obtained at 25.2 MHz. Comparisons are made with 13C nmr spectra taken at 22.6 MHz of the cyclic antibiotic nonactin and the synthetic polyether dicyclohexyl-18-crown-6 and their potassium complexes. The resonances of the carbonyls directly coordinating the potassium ion in valinomycin and nonactin shift downfield about 4 ppm upon complex formation. Smaller but comparable shifts in both up- and downfield directions for carbons away from the binding site are observed by comparisons of the spectra of free and complexed nonactin and the polyether. This suggests that conformational rearrangements of the molecule as a whole can compete with direct interactions between carbons and the potassium ion in determining 13C chemical shift differences between the free and complexed species." @default.
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- W1987283921 date "1972-01-01" @default.
- W1987283921 modified "2023-09-27" @default.
- W1987283921 title "Fourier transform C-13 nmr analysis of some free and potassium-ion complexed antibiotics" @default.
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- W1987283921 doi "https://doi.org/10.1016/0006-291x(72)90664-x" @default.
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