Abstract
A series of new cation complexing fluorescence probes is obtained by covalently linking the fluorophore benz[c,d]indole to the nitrogen atom of various macrocyclic receptors which differ in both the number and position of the heteroatoms, oxygen and nitrogen. The synthesis of these molecules, as well as their absorption and emission properties, are presented. A spectroscopic study of their complexation behavior shows that cation complexation is accompanied by spectral shifts of both the absorption and emission bands and an increase in fluorescence intensity and lifetime, even for heavy and transition metal ions often known as fluorescence quenchers.
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