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Related Concept Videos

Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.6K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.7K
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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Updated: May 7, 2026

Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
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Cu/Ce multivalent metal-organic frameworks: polydopamine-electronic modulation for multi-enzyme activity and

Qianyi Li1, Zuopeng Li2, Tianyu He1

  • 1Department of Chemistry, College of Science, China Agricultural University, Yuanmingyuan West Road 2#, Haidian District, Beijing 100193, China.

Journal of Colloid and Interface Science
|May 5, 2026
PubMed
Summary

A new dual-mode sensing platform using polydopamine-coated metal-organic frameworks enables simultaneous detection of pesticides, pollutants, and biomolecules. This innovative nanozyme platform enhances accuracy and flexibility in environmental and biosensing applications.

Keywords:
Bimetallic MOFsDual-mode sensingElectronic modulationNano-multienzymePolydopamine

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Multi-target detection requires enhanced accuracy and flexibility.
  • Developing integrated analytical platforms is crucial for advanced sensing.

Purpose of the Study:

  • To construct a fluorescence-colorimetric dual-mode sensing platform.
  • To utilize Cu/Ce multivalent metal-organic frameworks (Cu/Ce-MOFs) coated with polydopamine (PDA).
  • To enable simultaneous detection of diverse analytes.

Main Methods:

  • In-situ coating of polydopamine (PDA) on Cu/Ce-MOFs.
  • Characterization of the synthesized Cu/Ce-MOFs@PDA material.
  • Evaluation of the platform's dual-mode sensing capabilities for pesticides, phenolic pollutants, and biomolecules.

Main Results:

  • The Cu/Ce-MOFs@PDA exhibited excellent fluorescent properties and multienzyme-like nanozyme activity.
  • Synergistic redox cycling (Ce⁴⁺/Ce³⁺-Cu²⁺/Cu⁺) and PDA's electron modulation enhanced detection.
  • The platform showed high reproducibility, anti-interference, and applicability to real samples (84.3%-118.8% recovery).

Conclusions:

  • A generalizable approach for multifunctional bimetallic MOFs-based nanozymes was demonstrated.
  • The developed platform enables integrated analytical systems with multi-mode signal outputs.
  • This work advances environmental and biosensing applications through innovative nanozyme design.