A fluorescent probe for copper and hypochlorite based on rhodamine hydrazide framework |
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Authors: | Jung Won Yoon Min Jung Chang Seungwoo Hong Min Hee Lee |
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Institution: | Department of Chemistry, Sookmyung Women’s University, Seoul 04310, South Korea |
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Abstract: | A rhodamine derivative (1) was synthesized as a fluorescence turn-on probe for copper (Cu2+) and hypochlorite (ClO?). The probe gave a fluorescence turn-on change at 587 nm with a color change from colorless to pink in the presence of Cu2+ or ClO? ions in aqueous solution. It was found that the Cu2+ ion bound to 1 in a 1:1 stoichiometry and induced a spirolactam ring opening of the rhodamine moiety leading to a fluorescence turn-on, confirmed by Job’s plot, ESI-Mass, and 1H NMR analyses. In the presence of ClO? ion, probe 1 underwent a hypochlorite-mediated oxidation and hydrolysis to produce a ring-opened rhodamine B with a fluorescence enhancement. However, these changes were not monitored in case of other metal ions, anions, and reactive redox species. In addition, probe 1 can readily react with the ClO? to provide a distinct fluorescence enhancement along with a pink color even in the presence of various competitive species. |
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Keywords: | Fluorescence turn-on Rhodamine hydrazide Copper detection Hypochlorite detection |
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