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Natural Abundance Nitrogen-15 Nuclear Magnetic Resonance-Liquid Nitrogen

Bradley, C. H. and Hawkes, Geoffrey E. and Randall, E. W. and Roberts, John D. (1975) Natural Abundance Nitrogen-15 Nuclear Magnetic Resonance-Liquid Nitrogen. Journal of the American Chemical Society, 97 (7). pp. 1958-1959. ISSN 0002-7863.

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Following the estimation by Ramsey of the absolute value for the paramagnetic contribution (σ_p) to the absolute shielding of ^(15)N_2 relative to the bare nucleus ^(15)N, considerable interest has been expressed3 in establishing an absolute shielding scale for ^(14)N (and ^(15)N) nuclear magnetic resonance. This requires ^(15)N chemical shifts referenced to the ^(15)N_2 resonance via some secondary standard, usually ^(15)NH_4^+ or ^(15)NO_3^- in aqueous solution. To date, two measurement of the resonance position of ^(14)N_2 have been published as 14 and 70 ppm upfield from ^(14)NO_3^-, but doubts have been expressed about the accuracy of these values. One source of uncertainty in the reported chemical shifts arises from the line widths of the ^(14)N resonances. From the relaxation time data for liquid ^(14)N_2 at 77ºK of Armstrong and Speight, we estimate the width at half height of the ^(14)N resonance to be ca. 30 Hz (9.5 and 7 ppm at 10 and 13 kG, respectively.

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Additional Information:© 1975 American Chemical Society. Received April 2, 1975. Supported by the Public Health Service, Research Grant No. GM-11072, from the Division of General Medical Sciences and by the National Science Foundation.
Funding AgencyGrant Number
U.S. Public Health Service (USPHS)GM-11072
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Caltech Gates and Crellin Laboratories of Chemistry5020
Issue or Number:7
Record Number:CaltechAUTHORS:20151008-153159897
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Official Citation:Natural abundance nitrogen-15 nuclear magnetic resonance. Liquid nitrogen C. H. Bradley, Geoffrey E. Hawkes, E. W. Randall, and John D. Roberts Journal of the American Chemical Society 1975 97 (7), 1958-1959 DOI: 10.1021/ja00840a061
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60926
Deposited By: Ruth Sustaita
Deposited On:10 Oct 2015 12:15
Last Modified:03 Oct 2019 09:02

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