Nitrogen-15 Magnetic Resonance Spectroscopy. II. Coupling Constants
Abstract
Coupling constants have been measured between nitrogen-15 and directly bonded hydrogen or carbon-13, and between nitrogen-15 and hydrogen separated by two or more bonds. The data may generally be interpreted in terms of the Fermi contact coupling mechanism except for those cases where the electron distribution around the nitrogen atom is highly anisotropic. Empirical relationships have been developed which relate the observed J^(15)NH and J^(15)N^(13)C to the hybridization of the orbitals involved. These relationships fail for J^(16)NH in diphenylketimine and for J^(15)N^(13)C in benzalmethylamine and acetonitrile, probably because of contributions to the nuclear spin-spin coupling from electron orbital motion. The data are consistent with the interpretation that nitrogen in ammonia forms nearly sp^3 bonds to hydrogen, rather than p bonds as suggested by Pauling.
Additional Information
© 1964 American Chemical Society. Received August 25, 1964. Supported in part by the Public Health Service Research Grant 11072-01 from the Division of General Medical Sciences, the Office of Naval Research, and the National Science Foundation. National Science Foundation Graduate Fellow, 1962-1965; National Academy of Sciences-National Research Council Postdoctoral Fellow, 1963-1964.Additional details
- Eprint ID
- 61200
- DOI
- 10.1021/ja01078a033
- Resolver ID
- CaltechAUTHORS:20151016-110315378
- 11072-01
- U.S. Public Health Service (USPHS)
- Office of Naval Research (ONR)
- NSF
- NSF Graduate Fellowship
- National Academy of Sciences-National Research Council Postdoctoral Fellowship
- Created
-
2015-10-16Created from EPrint's datestamp field
- Updated
-
2023-10-25Created from EPrint's last_modified field
- Other Numbering System Name
- Caltech Gates and Crellin Laboratories of Chemistry
- Other Numbering System Identifier
- 3099