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Nuclear Magnetic Resonance Spectroscopy. Spin-Lattice Relaxation of the Acetic Acid Carboxyl Carbon

Gust, Devens and Pearson, Harry and Armitage, Ian M. and Roberts, John D. (1976) Nuclear Magnetic Resonance Spectroscopy. Spin-Lattice Relaxation of the Acetic Acid Carboxyl Carbon. Journal of the American Chemical Society, 98 (10). pp. 2723-2726. ISSN 0002-7863. doi:10.1021/ja00426a008.

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The carbon-13 spin-lattice relaxation times of the carboxyl carbons of acetic acid and its deuterated analogues (CH_3COOD, CD_3COOH, CD_3COOD) have been measured by nuclear magnetic resonance spectroscopy. These measurements reveal that the methyl protons and the hydroxyl proton contribute roughly equally to the total dipolar relaxation of neat acetic acid. Spin-rotation relaxation is also observed in these molecules. The T_1 and NOE values for the carboxyl carbon of acetic acid in aqueous solution each demonstrate a small concentration dependence in the region of high acid concentration. Although samples of 1 M acetic acid contaminated with paramagnetic metal ions show a marked pH dependence of T_1 and NOE, the T_1and NOE values for purified samples are invariant with respect to pH. Some chemical implications of the above behavior are discussed.

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Additional Information:© 1976 American Chemical Society. Received June 11, 1975. Supported by the National Science Foundation, and by the Public Health Service, Research Grant No. GM-11072, from the Division of General Medical Sciences.
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U.S. Public Health Service (USPHS)GM-11072
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Caltech Gates and Crellin Laboratories of Chemistry5124
Issue or Number:10
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Official Citation:Nuclear magnetic resonance spectroscopy. Spin-lattice relaxation of the acetic acid carboxyl carbon Devens Gust, Harry Pearson, Ian M. Armitage, and John D. Roberts Journal of the American Chemical Society 1976 98 (10), 2723-2726 DOI: 10.1021/ja00426a008
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60916
Deposited By: Ruth Sustaita
Deposited On:11 Oct 2015 11:03
Last Modified:10 Nov 2021 22:41

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