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A new calix(4)arene having pyrene and perylene moieties has been synthesized as a Na + detectable fluorescent ionophore. When excited at the pyrene moiety (342 nm) of the ionophore, a strong fluorescence emission of the perylene moiety (535 nm) was observed due to energy transfer from the pyrene to perylene. By addition of Na + at a low concentration in the range of 2.5-10 µM, the fluorescence was remarkably quenched. In contrast to the fluorescent behavior by the ionophore having pyrene and perylene moieties, the excimer emission of a calix(4)arene derivative having two pyrene moieties decreased by the addition of Na + with a concentration in the range of 50-200 µM.

Effective fluorescent sensing of Na+ ion by calix[4]arene bearing pyrene and perylene based on energy transfer