Naphthalimide-based fluorescent Zn chemosensors showing PET effect according to their linker length in water |
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Authors: | Soon Young Kim |
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Institution: | Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-747, Republic of Korea |
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Abstract: | We have developed naphthalimide-based fluorescent chemosensors that exhibit fluorescence enhancement upon binding Zn2+ ion in 10 mM HEPES buffer (pH 7.4) at 25 °C. The fluorescence enhancement was induced by a PET inhibition process in which electron transfer from the nitrogen lone pair electrons of the Dpa unit to naphthalimide was blocked upon the binding of the sensor to Zn2+. The longer the linker length (n = 1-3) of the sensor, the less the PET efficiency becomes. Among the sensors (1, 2, and 3) examined, 1 shows the highest selectivity and sensitivity for Zn2+ over other transition metal ions and alkali metal ions in water. |
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