Reversible "off-on" fluorescent chemosensor for Hg2+ based on rhodamine derivative

Weimin Liu, Jianhong Chen, Liwei Xu, Jiasheng Wu, Haitao Xu, Hongyan Zhang, Pengfei Wang
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy 2012, 85 (1): 38-42
A novel and simple fluorescent chemosensor based on rhodamine was designed and synthesized to detect Hg(2+) with high selectivity. The structure of chemosensor 1 was characterized by IR, (1)H NMR, and HRMS spectroscopies. Chemosensor 1 exhibited distinct fluorescent and colorimetric changes toward Hg(2+) in an ethanol/water (80/20, v/v) solution, which resulted in the formation of 1/Hg(2+) complex with the Hg(2+)-induced ring opening of the spirolactam ring in rhodamine. The reversibility of chemosensor 1 was verified through its spectral response toward Hg(2+) ions and TBAI (tetrabutylammonium iodide) titration experiments.

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