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ERIC Number: EJ1002722
Record Type: Journal
Publication Date: 2012-Sep
Pages: 9
Abstractor: As Provided
Reference Count: 55
ISBN: N/A
ISSN: ISSN-0021-9584
Marcus Theory: Thermodynamics CAN Control the Kinetics of Electron Transfer Reactions
Silverstein, Todd P.
Journal of Chemical Education, v89 n9 p1159-1167 Sep 2012
Although it is generally true that thermodynamics do not influence kinetics, this is NOT the case for electron transfer reactions in solution. Marcus Theory explains why this is so, using straightforward physical chemical principles such as transition state theory, Arrhenius' Law, and the Franck-Condon Principle. Here the background and applications of Marcus Theory are presented, with special emphasis given to biological redox reactions. Interesting conclusions that arise from the theory are also discussed. These include the nonlinear contribution of reorganization energy ([lambda]) to the activation free energy ([delta]G[superscript double dagger]), as well as the existence of a defined "normal range" of reaction cell potential ([delta]E[degrees]): Only if [delta]E[degrees] is within this range does a reaction of lower [lambda] have a lower [delta]G[superscript double dagger]; outside of this range, the lower-[lambda] reaction will have the higher [delta]G[superscript double dagger]. (Contains 1 table, 11 figures, and 2 schemes.)
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Research
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A