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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > November  >
In the Laboratory
Selection of an Analysis Wavelength: An Interesting Example Involving Solvatochromism and the Zwitterionic Dimroth-Reichardt's Betaine ET-30 Dye
Taihe Deng and William E. Acree Jr.
Department of Chemistry, University of North Texas, Denton, TX 76203-5070
Cover
November 1999
Vol. 76 No. 11
p. 1555
Abstract
A laboratory experiment is designed for studying the solvatochromic behavior of the zwitterionic Dimroth-Reichardt's betaine ET-30 dye. By spectrophotometric measurements, students determine the analysis wavelength for ET-30 dissolved in solvents of varying polarity. The five solvents selected for study give solutions that appear wine-red, violet, blue, green, and yellowish-green. Student observations afford an excellent opportunity for detailed discussions of how solvent polarity affects spectral transitions, which expands the presentation given in most analytical textbooks. Textbook presentations generally represent absorption and emission transitions in the form of a Jablonski diagram, with no discussion of solvatochromism and solvent-dependent wavelength shifts.
Supplement
A student handout for this experiment is available.
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*  Citation
 Deng, Taihe; Acree, William E., Jr. J. Chem. Educ. 1999 76 1555.
*  Keywords
 Solutions / Solvents; Laboratory Instruction; Analytical Chemistry
*  History
 Created:
Last Updated:		 October 12, 1999
November 22, 2005
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