An NBD-based Sensitive and Selective Fluorescent Sensor for Copper(II) Ion |
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Authors: | Shi-Rong Liu Shu-Pao Wu |
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Institution: | (1) Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan, 300, Republic of China; |
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Abstract: | A new 7-nitrobenz-2-oxa-1,3-diazole (NBD) derived fluorescent probe (1) exhibiting high selectivity for Cu2+ detection, produced significant fluorescence quenching in the presence of Cu2+ ion, while the metal ions Ca2+, Cd2+, Co2+, Fe2+, Hg2+, Mg2+, Mn2+, Ni2+ and Zn2+ produced only minor changes in fluorescence. The apparent association constant (K
a) for Cu2+ binding in chemosensor 1 was found to be 1.22 × 103 M−1. The maximum fluorescence quenching activity caused by Cu2+ binding to 1 was observed over the pH range 6–10. |
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