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1997
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June
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Symposium: Applications of Inorganic Photochemistry
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Dramatic Demonstration of Oxygen Sensing by Luminescence Quenching
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Kristi A. Kneas, Wenying Xu, J. N. Demas
Department of Chemistry, University of Virginia, Charlottesville, VA 22901
B. A. DeGraff
Department of Chemistry, James Madison University, Harrisonburg, VA 22807
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June 1997
Vol. 74 No. 6
p. 696
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| Abstract |
Luminescence-based oxygen sensors are of great interest, especially in biomedical areas, but explaining their operation to the inexperienced can be difficult. We describe a dramatic demonstration that illustrates the principles of oxygen sensors using luminescence quenching of a transition metal complex, either [Ru(bpy)3]Cl2, (bpy= 2,2'-bipyridine) or [Ru(Ph2phen)3]Cl2, (Ph2phen = 4,7-diphenyl-1,10-phenanthroline). The demonstration is simple, quick, and comprehensible even by non-chemists. It requires three solutions of the Ru(II) complex, a black light, oxygen, and some dry ice. One solution is air saturated and two are oxygen saturated. The visual differences in emission intensity for the different oxygen concentrations are easily discernible even to a large audience. By dropping a piece of dry ice into one of the oxygen saturated solutions, the oxygen is removed in seconds, and a spectacular increase in emission intensity can be observed. Students and faculty alike find this a clever demonstration of quenching and its analytical applications.
See Correction to this article.
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| More Information |
 Citation |
Kneas, Kristi A.; Xu, Wenying; Demas, J. N.; DeGraff, B. A. J. Chem. Educ. 1997 74 696.
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Keywords |
Inorganic Chemistry, Materials Science, Photochemistry, Luminscence
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History |
Created:
Last Updated: |
July 28, 1999
June 23, 2005
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Link to Correction added (May 2004).
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| Home > JCE Print > Journal of Chemical Education > Issues >
1997
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June
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696
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