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Carbon-13 Nuclear Magnetic Resonance Spectroscopy. Solvent Effects on Chemical Shifts

Lichter, Robert L. and Roberts, John D. (1970) Carbon-13 Nuclear Magnetic Resonance Spectroscopy. Solvent Effects on Chemical Shifts. Journal of Physical Chemistry, 74 (4). pp. 912-916. ISSN 0022-3654.

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The ^(13)C chemical shift of chloroform has been measured in a variety of solvents. Relative to dilute solution in cyclohexane, all of the solvents studied resulted in downfield shifts which, with the exceptions of benzene and acetonitrile, correlate linearly (r = 0.982) with the changes in proton shifts in the same solvents. The results, taken with the variation of the ^(13)C-H coupling constant with solvent, suggest that the solvent effects arise from changes in the average distance of the bonding electrons in the chloroform C-H bond as the result of intermolecular association. Contributions from the anisotropy of benzene and acetonitrile indicate that measurements of the chemical shift of more than one nucleus in the same molecule may allow detection and estimation of neighbor anisotropy contributions to chemical shifts.

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Additional Information:© 1970 American Chemical Society. Received June 16, 1969. Supported by the Public Health Service, Research Grant GM-11072-07 from the Division of General Medical Science and the National Science Foundation; Contribution No. 3875.
Funding AgencyGrant Number
U.S. Public Health Service (USPHS)GM-11072-07
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Caltech Gates and Crellin Laboratories of Chemistry3875
Issue or Number:4
Record Number:CaltechAUTHORS:20151013-111512255
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Official Citation:Carbon-13 nuclear magnetic resonance spectroscopy. Solvent effects on chemical shifts Robert L. Lichter and John D. Roberts The Journal of Physical Chemistry 1970 74 (4), 912-916 DOI: 10.1021/j100699a042
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61051
Deposited By: Ruth Sustaita
Deposited On:15 Oct 2015 03:44
Last Modified:03 Oct 2019 09:03

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