Abstract
The properties of fluoroionophores consisting of coumarin 153 linked to monoaza-12-crown-4, monoaza-15-crown-5, and diaza-18-crown-6 are described. The photophysical changes upon complexation with alkali and alkaline-earth metal cations can be described in terms of enhancement of the intramolecular charge transfer in the coumarin dye owing to the direct interaction between the bound cation and the carbonyl group of the coumarin. The magnitude of the photophysical changes is controlled by the charge density of the bound cation. In the case of the diaza-18-crown-6 linked to two coumarins, an interesting specific increase of the fluorescence quantum yield upon binding of potassium and barium ions is observed
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