Investigating the Thermodynamics of Charge-Transfer Complexes. A Physical Chemistry Experiment

Thermodynamic parameters for the formation of charge-transfer complexes in heptane solution are determined from UV–visible absorption measurements at different temperatures. The systems studied include complexes of molecular iodine with toluene, xylene, mesitylene, and t-butanol as well as those of...

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Bibliographic Details
Published in:	Journal of chemical education Vol. 86; no. 11; p. 1330
Main Authors:	Kendrow, Carolyn, Baum, J. Clayton, Marzzacco, Charles J
Format:	Journal Article
Language:	English
Published:	Easton Division of Chemical Education 01-11-2009 American Chemical Society
Subjects:	Charge transfer Chemical equilibrium Chemistry Complexation Experiments Femtosecond Organic chemistry Physical chemistry Spectrum analysis Thermodynamic equilibrium Thermodynamics Vapor phases Hands-On Learning / Manipulatives Upper-Division Undergraduate Laboratory Instruction Equilibrium
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Summary:	Thermodynamic parameters for the formation of charge-transfer complexes in heptane solution are determined from UV–visible absorption measurements at different temperatures. The systems studied include complexes of molecular iodine with toluene, xylene, mesitylene, and t-butanol as well as those of chloranil with mesitylene and hexamethylbenzene. Student results are in good agreement with published values. In addition to introducing an important method for studying chemical systems at equilibrium, this experiment explores the nature of charge-transfer interactions that play a significant role in chemistry and biology.
ISSN:	0021-9584 1938-1328
DOI:	10.1021/ed086p1330