Werner, Tobias and Klimant, Ingo and Huber, Christian and Krause, Christian and Wolfbeis, Otto S. (1999) Fiber optic ion-microsensors based on luminescence lifetime. MIKROCHIMICA ACTA, 131 (1-2). pp. 25-28. ISSN 0026-3672,
Full text not available from this repository.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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ENERGY-TRANSFER; DECAY TIME; PH; COMPLEXES; FLUOROMETRY; OPTODES; SENSORS; microsensor; energy transfer; luminescence decay time; ion sensor |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Antje J. Bäumner, formerly Prof. Wolfbeis) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Dec 2022 07:03 |
| Last Modified: | 05 Dec 2022 07:03 |
| URI: | https://pred.uni-regensburg.de/id/eprint/48702 |
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