The photophysics of some 3-hydroxyflavone derivatives in the presence of protons, alkali metal and alkaline earth cations
| Autor: | Cathrin Spies, Xavier Poteau, Ginagunta Saroja, Robert G. Brown |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
chemistry.chemical_classification
Alkaline earth metal General Chemical Engineering Inorganic chemistry 3-Hydroxyflavone General Physics and Astronomy General Chemistry Alkali metal Fluorescence Metal chemistry.chemical_compound stomatognathic system chemistry visual_art visual_art.visual_art_medium Absorption (chemistry) Crown ether |
| Zdroj: | Journal of Photochemistry and Photobiology A: Chemistry. 162:431-439 |
| ISSN: | 1010-6030 |
| DOI: | 10.1016/s1010-6030(03)00429-5 |
| Popis: | The absorption and fluorescence properties of three monoaza crown ether (either 15-crown-5 or 18-crown-6 substituted at the 4′-position) 3-hydroxy- and 3-methoxy-flavone compounds in the presence of protons, alkali metal and alkaline earth cations are reported. The corresponding 4′-dimethylamino-flavones were also studied for comparison. All the compounds protonate in moderate acid (tens of mM H + ) with significant changes in emission only being observed for the 3-methoxy derivatives. The crown ether compounds bind the alkaline earths with binding constants of the order of 10 4 dm 3 mol −1 and with two moles of metal ion being bound at high concentrations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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