Dramatic Demonstration of Oxygen Sensing by Luminescence Quenching
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[1] University of Virginia
University of Virginia
Estados Unidos
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[2] James Madison University
James Madison University
Estados Unidos
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- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 74, Nº 6 (June), 1997, págs. 696-696
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
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.
