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  Home > JCE Print > Journal of Chemical Education > Issues > 1998  > December  >
In the Laboratory
Conformation Interchange in Nuclear Magnetic Resonance Spectroscopy
Keith C. Brown, Randy L. Tyson, and John A. Weil
University of Saskatchewan, Department of Chemistry, 110 Science Place, Saskatoon, SK S7N 5C9, CANADA
Cover
December 1998
Vol. 75 No. 12
p. 1632
Abstract
Intramolecular dynamics are readily discernible by use of nuclear magnetic resonance spectrometry. A relatively simple laboratory tutorial experiment demonstrating such motion, an internal interchange of conformations, in a readily available nitroaromatic hydrazine (2,2-diphenyl-1-picrylhydrazine in liquid solution) is presented and discussed. Simple computer analysis of the 1H line shapes taken on standard NMR equipment at several temperatures produces the activation energy (as well as the pseudothermodynamic enthalpy, entropy, and Gibbs free-energy changes) for the process. The molecular basis for the molecular motion is easily visualizable.
More Information
*  Citation
 Brown, Keith C.; Tyson, Randy L.; Weil, John A. J. Chem. Educ. 1998 75 1632.
*  Keywords
 Laboratory Instruction; Organic Chemistry; Magnetic Properties; Molecular Properties / Structure; NMR Spectrometry; Stereochemistry
*  History
 Created:
Last Updated:		 June 18, 1999
June 24, 2005
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