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A novel tetrahomodioxacalix[4]arene (7) bearing both naphthyl- and pyrenyl-amide pendants was synthesized as FRET-based fluorometric sensor for Cu 2+ ion. Intramolecular FRET from the naphthalene emission to the pyrene absorption affords Cu 2+ ion selectivity over other metal ions. Upon addition of Cu 2+ ion, the complex solution of 7 gave a significantly decreased pyrene acceptor...
A new fluorogenic sensor 1 capable of illustrating metal ion-triggered FRET changes has been synthesized. Based on the FRET changes, 1, bearing coumarin-fluorescein moieties, provides a selective sensor for Cu 2+ and Hg 2+ ions for experiments implemented in aqueous media with a chloride counter anion.
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