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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > January  >
In the Laboratory
Examination of Electron Transfer Self-Exchange Rates Using NMR Line-Broadening Techniques: An Advanced Physical Inorganic Laboratory Experiment
Donald L. Jameson and Rajan Anand
Department of Chemistry, Gettysburg College, Gettysburg, PA 17325-1486
Cover
January 2000
Vol. 77 No. 1
p. 88
Abstract
This article describes the determination of the decamethylferrocene(Fc*)/decamethylferrocenium (Fc*+) electron transfer self-exchange rate by NMR line-broadening techniques. NMR spectra of Fc*, Fc*+, and several mixtures yield frequency and peak-width data that are used to solve for the self-exchange rate constant. Students obtain rate constants in the range 1.6 x 107 to 2.4 x 107 M-1 s-1 (38 °C in acetone-d6), which is in good agreement with the literature value of 2.4 x 107 M-1 s-1 (25 °C). The experiment represents an alternative to the classic rate of amide bond rotation as a demonstration of the effectiveness of NMR in analyzing dynamic molecular processes.
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Background information, experimental procedure, instructor's notes, and figures are provided.
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*  Citation
 Jameson, Donald L.; Anand, Rajan. J. Chem. Educ. 2000 77 88.
*  Keywords
 Laboratory Instruction; Kinetics; Organometallics; Redox Reactions; NMR Spectrometry
*  History
 Created:
Last Updated:		 December 9, 1999
August 31, 2005
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