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Rapid and efficient analyses of copper ions are crucial to providing key information for Cu 2+ in living cells because of their biological importance. In this study, we reported one new turn-off fluorescent sensor for Cu 2+ with a benzo[ k , l ]xanthene core, which served as an efficient cation sensor for copper ion over a wide range of other cations (Na + , K + , Ag + , Hg 2+ , Cd 2+ , Co 2+ , Ni 2+ , Zn 2+ , Mg 2+ , and Fe 3+ ) owing to the catechol group in the aromatic core. The sensor showed selectivity for Cu 2+ over other ions; the log K  β for Cu 2+ binding to compound 1 had a value of 13.265. In the presence of Cu 2+ , sensor 1 provided significant fluorescence decrement; Co 2+ , and Ni 2+ caused a fluorescence decrement when employed at a higher concentration than Cu 2+ , while Na + , K + , Hg 2+ , Cd 2+ , Zn 2+ , and Mg 2+ metal ions produced only minor changes in fluorescence intensity. Fluorescence experiments demonstrate that compound 1 may have an application as a fluorescent probe for detecting Cu 2+ with a limit of detection of 0.574 µM.

A Rare Natural Benzo[k,l]xanthene as a Turn-Off Fluorescent Sensor for Cu2+ Ion