Roberts, John D. and Lichter, Robert L. (1971) ^(15)N Nuclear Magnetic Resonance Spectroscopy. XII. Nuclear Overhauser Enhancement of ^(15)N Resonances. Journal of the American Chemical Society, 93 (13). pp. 3200-3203. ISSN 0002-7863. doi:10.1021/ja00742a018. https://resolver.caltech.edu/CaltechAUTHORS:20151012-133438435
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Abstract
The enhancement of the ^(15)N signal intensity of ammonium chloride by means of the nuclear Overhauser effect (NOE) has been measured as a function of pH. At low pH under conditions of complete proton decoupling, the ratio of the coupled to decoupled signal intensities is about 56 of the theoretical maximum and the signal is inverted. As the pH is raised, the decoupled signal progressively diminishes in intensity, disappears, and reappears upright. The observations are explained in terms of contributions to relaxation from spin-rotation interactions and from chemical modulation of the N-H spin-spin coupling constant. Implications for natural abundance ^(15)N spectroscopy are discussed.
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| Alternate Title: | Nitrogen-15 nuclear magnetic resonance spectroscopy. XII. Nuclear Overhauser enhancement of nitrogen-15 resonances | |||||||||
| Additional Information: | © 1971 American Chemical Society. Received August 3, 1970. Supported by the Public Health Service, Research Grant No. GM-11072-07 from the Division of General Medical Sciences. | |||||||||
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| Issue or Number: | 13 | |||||||||
| DOI: | 10.1021/ja00742a018 | |||||||||
| Record Number: | CaltechAUTHORS:20151012-133438435 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20151012-133438435 | |||||||||
| Official Citation: | Nitrogen-15 nuclear magnetic resonance spectroscopy. XII. Nuclear Overhauser enhancement of nitrogen-15 resonances John D. Roberts and Robert L. Lichter Journal of the American Chemical Society 1971 93 (13), 3200-3203 DOI: 10.1021/ja00742a018 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 60992 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 15 Oct 2015 04:16 | |||||||||
| Last Modified: | 10 Nov 2021 22:42 |
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