Synthesis and fluorescence behaviour of crown and azacrown ethers carrying the dansyl fluorophore as a pendant in acetonitrile solution
| Autor: | Tadeusz Ossowski, Hanna Sulowska, Wiesław Wiczk, Janusz Młodzianowski, Monika Przyborowska |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
chemistry.chemical_classification
Quenching (fluorescence) General Chemical Engineering General Physics and Astronomy General Chemistry Chromophore Photochemistry Fluorescence Fluorescence spectroscopy chemistry.chemical_compound chemistry Qualitative inorganic analysis Absorption (chemistry) Acetonitrile Crown ether |
| Zdroj: | Journal of Photochemistry and Photobiology A: Chemistry. 150:249-255 |
| ISSN: | 1010-6030 |
| DOI: | 10.1016/s1010-6030(02)00090-4 |
| Popis: | The influence of Li+, Na+, K+, Cs+, Mg2+, Ca2+, Sr2+, Ba2+, Co2+, Ni2+, Cu2+, Zn2+, Pb2+ and Al3+ ions on the spectroscopic properties of the dansyl group covalently linked to crown ether or diazacrown ethers was investigated by means of absorption and emission spectrophotometry. Interaction of the alkali metal ions with all fluoroionophores studied is weak, while alkaline earth metal ions interact strongly causing about 50% quenching of dansyl fluorescence of A21C5-Dns and A218C6-Dns. The Cu2+, Pb2+ and Al3+ cations interact very strongly with dansyl chromophore regardless the crown ether type, causing a major change in absorption spectrum of the chromophore and forming non-fluorescent complexes. The Co2+, Ni2+, Zn2, Mg2+ and Ag+ cations interact moderately with all fluoroionophores studied causing about 20% of fluorescence quenching of dansyl, except for a strong dansyl fluorescence quenching of 15C5-Dns by Co2+ ion. The quenching efficiency of didansylated fluoroionophores by the alkali metal ions and alkaline earth metal ions is weaker than monodansylated ones. |
| Databáze: | OpenAIRE |
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