Proton relaxation in 13C-enriched molecules; 13C T1 and NOE data from proton magnetic resonance measurements

The proton relaxation of several 13C-labeled molecules has been studied. A comparison of the spin-lattice relaxation rate of the center proton resonances corresponding to the unlabeled molecule with the relaxation rates of the 13C satellites enables the contribution of the 13C 1H dipolar interactio...

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Bibliographic Details
Published in:Journal of magnetic resonance (1969) 1977-05, Vol.26 (2), p.213-218
Main Authors: London, R.E, Walker, T.E, Kollman, V.H, Matwiyoff, N.A
Format: Article
Language:English
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Summary:The proton relaxation of several 13C-labeled molecules has been studied. A comparison of the spin-lattice relaxation rate of the center proton resonances corresponding to the unlabeled molecule with the relaxation rates of the 13C satellites enables the contribution of the 13C 1H dipolar interaction to be accurately determined. This interaction is roughly equivalent in magnitude to the 1H 1H dipolar interaction for a methylene group due to the smaller 13C 1H distance. The data can be used to obtain reasonable values for the T 1 13C, of protonated carbons. A comparison with the directly measured T 1 13c values enables a quick determination of the nuclear Overhauser enhancement to be made.
ISSN:0022-2364
1557-8968
DOI:10.1016/0022-2364(77)90166-4