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A Zn(2+)-responsive highly sensitive fluorescent probe and 1D coordination polymer based on a coumarin platform
Virendra Kumar1, Ajit Kumar, Uzra Diwan
1Department of Chemistry (Centre of Advanced Study), Faculty of Science, Banaras Hindu University, Varanasi-221005, India. drkaushalbhu@yahoo.co.in.
A novel coumarin-based Schiff base selectively detects zinc ions (Zn2+) with high sensitivity in a near-aqueous environment. This fluorescence sensor offers rapid response and a low detection limit for zinc, utilizing combined sensing mechanisms.
Area of Science:
- Chemical Sensing
- Materials Chemistry
- Coordination Chemistry
Background:
- Schiff bases derived from coumarin are valuable fluorescent probes.
- Selective detection of metal ions like Zn(2+) is crucial in environmental and biological monitoring.
- Understanding sensing mechanisms enhances probe design.
Purpose of the Study:
- To synthesize and characterize a coumarin-based Schiff base (receptor 1).
- To investigate the selective fluorescence sensing of Zn(2+) ions.
- To elucidate the sensing mechanisms and structural aspects of the receptor and its Zn(2+) complex.
Main Methods:
- Synthesis and characterization of coumarin-based Schiff base.
- Fluorescence spectroscopy for sensing studies.
- UV-visible, IR, and NMR spectroscopy for structural analysis.
- Single crystal X-ray diffraction (XRD) for detailed structural elucidation.
Main Results:
- Receptor 1 showed selective fluorescence enhancement upon binding with Zn(2+) at nanomolar concentrations.
- The sensing response was instantaneous with a low detection limit (3.26 × 10(-9) M).
- Spectroscopic and XRD studies confirmed intramolecular charge transfer (ICT), chelation-enhanced fluorescence (CHEF), and C=N isomerization mechanisms, and revealed a 1D coordination polymer structure for the Zn(2+) complex.
Conclusions:
- The coumarin-based Schiff base is an effective fluorescent sensor for Zn(2+).
- The sensing mechanism involves a combination of ICT, CHEF, and isomerization.
- The Zn(2+) complex forms a unique 1D coordination polymer structure.
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