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^(15)N Nuclear Magnetic Resonance Spectroscopy. XII. Nuclear Overhauser Enhancement of ^(15)N Resonances

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ja00742a018DOIArticle
http://pubs.acs.org/doi/abs/10.1021/ja00742a018PublisherArticle
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.
Funders:
Funding AgencyGrant Number
U.S. Public Health Service (USPHS)GM-11072-07
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Gates and Crellin Laboratories4102
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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