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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > August  >
In the Laboratory
Kinetics of Internal Rotation of N,N-Dimethylacetamide: A Spin-Saturation Transfer Experiment
Russell L. Jarek , Robert J. Flesher, and Seung Koo Shin
Department of Chemistry, University of California at Santa Barbara, Santa Barbara, CA 93106
Cover
August 1997
Vol. 74 No. 8
p. 978
Abstract
A new experiment for the undergraduate physical chemistry laboratory is presented for the application of dynamic nuclear magnetic resonance (DNMR) spectroscopy to the study of internal rotation kinetics in N, N-dimethylacetamide (DMA). Spin-lattic relaxation times (T1) were measured by the inversion recovery method and rates of internal rotation about the amide bond in DMA were measured bya spin-saturation transfer method in the temperature range 5-23°C. The activation parameters, DeltaH298 = 70.6+1.4 kJ/mol and DeltaS298 = -11+5 kJ/mol, were determined from the temperature dependence of the rate of internal rotation. Through the temperature range used in the present work is quite narrow compared with the line-shape analysis experiment, the derived thermodynamic data are in excellent agreement with more extensive measurements.
More Information
*  Citation
 Jarek , Russell L. ; Flesher, Robert J. ; Shin, Seung Koo. J. Chem. Educ. 1997 74 978.
*  Keywords
 Physical Chemistry, Equilibrium, Kinetics, NMR Spectrometry
*  History
 Created:
Last Updated:		 July 28, 1999
June 23, 2005
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