Abstract
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.
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Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
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