A Rhodamine-based Dual Chemosensor for the Simultaneous Detection of Fe3+and Cu2.
A Rhodamine-based dual chemosensor L1 for simultaneously detecting Fe3+and Cu2+was designed and synthesized. The spectroscopic properties of L1 were analyzed, and its recognition mechanism was speculated. We found that the addition of Fe3+induced a great fluorescence enhancement, while Cu2+induced a strong UV-Vis absorption enhancement. The results revealed that L1 was highly selective for recognizing Fe3+and Cu2+in UV-Vis spectroscopy in CH3OH-H2O (1/1, v/v, pH 7.2) with the interference of other metal ions. A good linear relationship between the fluorescence intensities of L1 and the concentration of Fe3+, as well as the UV-Vis absorption intensities of L1 and the concentration of Cu2+was observed, respectively. The detection limit was 9.2 × 10-8M (5.5 μg/L) for Fe3+and 3.8 × 10-8M (2.4 μg/L) for Cu2+, respectively. The detection capacity for targeted metal ions of Fe3+and Cu2+were studied, which are less than 5 min. Job's plot method for L1 with Fe3+and ESI-MS for L1 with Cu2+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.
Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Environment, Nanjing Normal University.
Tao
T
Lan
Feng-He
FH
Wang
Xing-Jun
XJ
Xi
Chun-Wen
CW
Cheng
Wu
W
Lei
Ming-Zhu
MZ
Xia
Feng-Yun
FY
Wang