Journal of the Korean Magnetic Resonance Society (한국자기공명학회논문지)
- Volume 4 Issue 1
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- Pages.29-40
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- 2000
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- 1226-6531(pISSN)
An NMR Study on Internal Rotation of $CH_3$ Group in 1,1,1-Trichloroethane
- Hyung Namgoong (School of Chemistry and Institute of Molecular Science College of Natural Sciences Seoul National University) ;
- Kim, Joa-Jin (School of Chemistry and Institute of Molecular Science College of Natural Sciences Seoul National University) ;
- Lee, Jo-Woong (School of Chemistry and Institute of Molecular Science College of Natural Sciences Seoul National University)
- Published : 2000.02.01
Abstract
Coupled carbon-13 relaxation study of 1,1,1-trichloroethane dissolved in DMSO has been performed to gain some crucial insight into the dynamics of methyl group in this compound. For this purpose the relaxation behaviors of several observable magnetization modes for CH3 spin system generated by various perturbing pulse sequences have been carefully investigated and various dipolar spectral densities were estimated by nonlinear numerical fittings of the observed data with the relaxation curves, which were then employed to determine the three principal values for the diffusion tensor for end-over-end molecular rotation as well as internal rotational parameters of methyl group. In this process we could uniquely determine two correlation times
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