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Reversible "off-on" fluorescent chemosensor for Hg2+ based on rhodamine derivative
Weimin Liu1, Jianhong Chen, Liwei Xu
1Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|October 25, 2011
Summary
A new rhodamine-based fluorescent chemosensor selectively detects mercury ions (Hg2+). This sensor shows distinct color and fluorescence changes upon binding, offering a reversible detection method.
Area of Science:
- Analytical Chemistry
- Materials Science
- Organic Chemistry
Background:
- Mercury ions (Hg2+) pose significant environmental and health risks.
- Selective and sensitive detection of Hg2+ is crucial for monitoring and remediation.
- Rhodamine derivatives are widely explored for developing chemosensors due to their tunable photophysical properties.
Purpose of the Study:
- To design and synthesize a novel rhodamine-based fluorescent chemosensor for selective Hg2+ detection.
- To investigate the sensing mechanism and reversibility of the developed chemosensor.
- To evaluate the chemosensor's performance in a mixed solvent system.
Main Methods:
- Synthesis of a rhodamine-based chemosensor (Chemosensor 1).
- Structural characterization using Infrared (IR) spectroscopy, proton Nuclear Magnetic Resonance ((1)H NMR), and High-Resolution Mass Spectrometry (HRMS).
- Spectroscopic analysis (fluorescence and colorimetric) in ethanol/water (80/20, v/v) solution to assess Hg2+ detection and reversibility studies using tetrabutylammonium iodide (TBAI) titration.
Main Results:
- Successful synthesis and characterization of Chemosensor 1.
- Chemosensor 1 exhibited distinct and rapid fluorescent and colorimetric responses to Hg2+.
- The sensing mechanism involves Hg2+-induced opening of the rhodamine spirolactam ring, forming a 1/Hg2+ complex.
- The chemosensor demonstrated reversibility in its spectral response.
Conclusions:
- A novel and simple rhodamine-based fluorescent chemosensor for selective Hg2+ detection has been developed.
- The chemosensor exhibits excellent sensitivity and selectivity for Hg2+ through a ring-opening mechanism.
- The reversible nature of the chemosensor makes it a promising candidate for practical applications in mercury ion monitoring.
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