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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Turn-On Metal Ion Responsive Behavior Enabled by Coordination-Driven Multicomponent Self-Assembly.

Shaozhi Wang1, Manman Dai1, Ning Zhang2

  • 1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin130012, China.

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|April 22, 2026
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Summary
This summary is machine-generated.

This study introduces a new fluorescence sensing system for detecting heavy metal ions. The developed mixed-ligand probes offer a sensitive and selective method for identifying zinc (Zn(II)) and cadmium (Cd(II)) in environmental samples.

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Industrialization and agriculture increase heavy metal contamination, posing environmental risks.
  • Developing sensitive and selective detection methods for heavy metals like Zn(II) and Cd(II) is crucial.

Purpose of the Study:

  • To design and synthesize novel mixed-ligand fluorescent probes for detecting Zn(II) and Cd(II).
  • To establish a turn-on fluorescence sensing system based on multicomponent assembly.

Main Methods:

  • Synthesis of mixed-ligand probes incorporating tetraphenylethylene (TPE) and binaphthyl units.
  • Investigation of probe response to 17 different metal ions using fluorescence spectroscopy.
  • Fluorescence titration experiments to determine limits of detection (LODs).

Main Results:

  • The mixed ligands (L2 and L3) selectively induced significant fluorescence enhancement only for Zn(II) and Cd(II).
  • Heteroleptic assemblies S2 and S4 showed a 100-fold increase in fluorescence efficiency compared to the free ligand.
  • Achieved low LODs for Zn(II) (1.7 × 10⁻⁷ M) and Cd(II) (1.8 × 10⁻⁷ M), outperforming other ligand combinations.

Conclusions:

  • Mixed ligands L2 and L3 form effective turn-on fluorescent probes for Zn(II) and Cd(II).
  • The developed system offers a fast, sensitive, and selective method for heavy metal detection.