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In the Laboratory
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JCE Featured Molecules
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Molecular Models of Dyes
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William F. Coleman
Department of Chemistry, Wellesley College, Wellesley, MA 02481
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November 2007
Vol. 84 No. 11
p. 1798
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The paper on the synthesis of several dyes by James V. McCullagh and Kelly A. Daggett (1) provides us with the JCE Featured Molecules for this month. The authors mention various applications of these dyes, ranging from commercial dyeing to techniques for determining the course of complex biochemical processes. One of the reaction products, rhodamine B, is a member of a family of molecules that are widely used as tunable laser dyes. In this application, the rhodamines are most commonly encountered in a cationic form, rather than in the neutral form shown in the paper. In the cations, the carboxyl group is no longer part of a ring system. Several different members of the rhodamine family are included in the molecule collection because substituents have a marked effect on the effective lasing range of a given dye. Additionally, the solvent and the excitation source also influence the lasing range (2). Students can learn more about the relationship between structure, absorption and emission properties, and lasing ranges of various dyes by consulting ref 2 and from PhotochemCAD, Jonathan Lindsey’s free application (3).
 fluorescein
rhodamine 
Students can examine the structures of molecular dyes along with other molecules in the collection, at the JCE Digital Library Web site.
Literature Cited
- McCullagh, J. V.; Daggett, K. A. J. Chem. Educ. 2007, 84, 1799–1802.
- Details of the properties of many laser dyes are found at the Exciton Web site (accessed Sep 2007).
- The application (Windows systems only) is available for download (accessed Sep 2007).
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| More Information |
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Citation |
Coleman, William F. J. Chem. Educ. 2007, 84, 1798.
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Keywords |
Computer-Based Learning; Dyes / Pigments; First-Year Undergraduate / General; Hands-On Learning / Manipulatives; Second-Year Undergraduate
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History |
Created:
Last Updated: |
9/19/2007
9/24/2007
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 Caution! | | Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations. |
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