A new metal sensory system based on intramolecular fluorescence quenching on the ionophoric calix[4]arene ring

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Abstract
To design a new metal sensory system, calix[4]arene bearing pyrene (as a fluorophore) and nitrobenzene (as a quencher) near the ionophoric cavity is synthesized: in response to the metal-binding event the fluorescence intensity is dramatically enhanced.