A Rhodamine-based Dual Chemosensor for the Simultaneous Detection of Fe^3+ and Cu^2+

A Rhodamine-based dual chemosensor LI for simultaneously detecting Fe^3+ and Cu^2+ was designed and synthesized. The spectroscopic properties of LI were analyzed, and its recognition mechanism was speculated. We found that the addition of Fe^3+ induced a great fluorescence enhancement, while Cu^2+ induced a strong UV-Vis absorption enhancement. The results revealed that LI was highly selective for recognizing Fe^3+ and Cu^2+ in UV-Vis spectroscopy in CH_3OH-H_2O (1/1, v/v, pH 7.2) with the interference of other metal ions. A good linear relationship between the fluorescence intensities of LI and the concentration of Fe^3+, as well as the UV-Vis absorption intensities of LI and the concentration of Cu^2+ was observed, respectively. The detection limit was 9.2 × 10^−8 M (5.5 μg/L) for Fe^3+ and 3.8 × 10^−8 M (2.4 μg/L) for Cu^2+, respectively. The detection capacity for targeted metal ions of Fe^3+ and Cu^2+ were studied, which are less than 5 min. Job's plot method for LI with Fe^3+ and ESI-MS for LI with Cu^2+ indicated a 1:1 stoichiometry in the complex. The results may provide an effective strategy for the design of new dual chemosensors for the rapid detection of targeted metal ions.

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