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Turn-on fluorescent chemosensor for Hg²⁺ based on multivalent rhodamine ligands
Xuemei Wang1, Mudassir Iqbal, Jurriaan Huskens
1Laboratory of Molecular Nanofabrication, MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands. w.verboom@utwente.nl.
International Journal of Molecular Sciences
|December 11, 2012
Summary
New rhodamine-based fluorescent chemosensors selectively detect Fe3+ and Hg2+ ions. Chemosensor 1 demonstrates high sensitivity and selectivity for mercury (Hg2+) detection within a broad pH range.
Area of Science:
- Analytical Chemistry
- Materials Science
- Organic Chemistry
Background:
- Fluorescent chemosensors are crucial for detecting metal ions.
- Rhodamine derivatives offer promising platforms for sensor development.
- Selective detection of environmentally relevant metal ions like Hg2+ is a significant challenge.
Purpose of the Study:
- To design and synthesize novel rhodamine-based fluorescent chemosensors.
- To investigate the selective detection of Fe3+ and Hg2+ using these chemosensors.
- To optimize conditions for sensitive and selective Hg2+ detection with bis(rhodamine) chemosensor 1.
Main Methods:
- Synthesis of rhodamine-based compounds 1 and 2.
- Spectroscopic analysis (fluorescence spectroscopy) for metal ion detection.
- Optimization of solvent composition, pH, and concentration for chemosensor performance.
Main Results:
- Chemosensors 1 and 2 showed selective fluorescence enhancement for Fe3+ and Hg2+ at 580 nm.
- Bis(rhodamine) chemosensor 1 exhibited high selectivity and sensitivity towards Hg2+.
- Optimized conditions yielded a linear working range of 0-50 μM for Hg2+, a pH span of 4-10, and a detection limit of 0.4 μM.
Conclusions:
- Rhodamine-based chemosensors 1 and 2 are effective for selective metal ion sensing.
- Chemosensor 1 is a highly selective and sensitive probe for Hg2+ detection.
- The developed sensor demonstrates potential for environmental and biological monitoring of mercury.
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