Published May 1, 1964
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Nitrogen-15 magnetic resonance spectroscopy, I. Chemical shifts
Abstract
Except for the original determination(1) of nuclear moments, nitrogen magnetic resonance spectroscopy has been limited to the isotope of mass number 14. Although N14 is an abundant isotope, it possesses an electric quadrupole moment, which seriously broadens the resonances of nitrogen in all but the most symmetrical of environments.(2) Consequently, nitrogen n.m.r. spectroscopy has seen only limited use in the determination of organic structure. It might be expected that N15, which has a spin of ½ and no quadrupole moment, would be very useful, but the low natural abundance (0.36%) and the inherently low signal intensity (1.04 x 10^(-3) that of H1 at constant field) have thus far precluded utilization of N15 in n.m.r. spectroscopy.(3)
Additional Information
© 1964 by the National Academy of Sciences. Communicated March 23, 1964. Supported in part by U.S. Public Health Service research grant 11072-01 from the Division of General Medical Sciences, the Office of Naval Research, and the National Science Foundation. Contribution No. 3082 from the Gates and Crellin Laboratories of Chemistry, California Institute of TechnologyFiles
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