Fiber Optic Ion-Microsensors Based on Luminescence Lifetime |
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Authors: | Tobias Werner Ingo Klimant Christian Huber Christian Krause Otto S Wolfbeis |
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Institution: | (1) University of Regensburg, Institute of Analytical Chemistry, Chemo- and Biosensors, 93040 Regenburg, Germany, DE |
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Abstract: | Fiber optic ion-microsensors based on luminescence decay time have been developed for chloride and potassium. The fiber tip
coatings consist of the respective ion-selective lipophilic ion carrier, plasticized PVC, and the ruthenium(II) tris-4,4′-diphenyl-2,2′-bipyridyl
ion-pair with Bromothymol Blue Ru(dibipy)3(BTB)2] as a proton donor. The efficacy of radiationless fluorescence energy transfer from the donor (the ruthenium complex) to
the acceptor (BTB) is mediated by the ion concentration within the samples. The chloride response is based on the co-extraction
of chloride along with protons from the aqueous sample into a plastiziced PVC membrane, whereas in the presence of potassium
ions in the sample, the neutral BTB becomes deprotonated on extraction of potassium ions, with the release of protons. Both
processes result in a change in BTB absorbance. The absorption band of deprotonated BTB overlaps significantly with the emission
band of the ruthenium complex, allowing radiationless energy transfer to take place.
Received July 8, 1998. Revision November 10, 1998. |
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Keywords: | : microsensor energy transfer luminescence decay time ion sensor |
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