Abstract
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 emission along with an enhancement of naphthalene donor emission via FRET On–Off event.
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