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Fourier transform C-13 NMR analysis of some free and potassium-ion complexed antibiotics.Fourier transforms of the noise-decoupled, natural abundance C-13 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 C-13 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 results obtained suggest that conformational rearrangements of the molecule as a whole can compete with direct interactions between carbons and the potassium ion in determining C-13 chemical shift differences between the free and complexed species.
Document ID
19720046196
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ohnishi, M.
Fedarko, M.-C.
Baldeschwieler, J. D.
(Stanford University Stanford, Calif., United States)
Johnson, L. F.
(Varian Associates, NMR Laboratories, Palo Alto Calif., United States)
Date Acquired
August 6, 2013
Publication Date
January 14, 1972
Publication Information
Publication: Biochemical and Biophysical Research Communications
Volume: 46
Subject Category
Chemistry
Accession Number
72A29862
Funding Number(s)
CONTRACT_GRANT: NGL-05-020-250
CONTRACT_GRANT: NSF GP-4924
CONTRACT_GRANT: NIH-GM-14752
Distribution Limits
Public
Copyright
Other

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