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Related Concept Videos

Complexometric Titration: Overview00:39

Complexometric Titration: Overview

7.8K
Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
7.8K
Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

350
Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...
350
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

1.1K
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...
1.1K
Colors and Magnetism03:02

Colors and Magnetism

12.3K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.3K
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

3.3K
The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides...
3.3K
Enzyme-Linked Immunosorbent Assay01:33

Enzyme-Linked Immunosorbent Assay

14.2K
In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen.  Enzyme-substrate reaction allows the antigen to be visualized or...
14.2K

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Updated: Sep 14, 2025

Design and Development of Aptamer&#8211;Gold Nanoparticle Based Colorimetric Assays for In-the-field Applications
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Design and Development of Aptamer–Gold Nanoparticle Based Colorimetric Assays for In-the-field Applications

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Advances in metal complex-based colorimetric sensors.

Zhongmei Chi1, Shiqi Chu1, Bingqian Wang1

  • 1College of Chemistry and Materials Engineering, Professional Technology Innovation Center of Liaoning Province for Conversion Materials of Solar Cell, Bohai University, Jinzhou, 121013, China.

Talanta
|July 22, 2025
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Summary

Metal complexes and their composites are key to colorimetric analysis and sensor technology. Research highlights their tailored sensing properties and enhanced performance through nanomaterial integration.

Keywords:
Colorimetric sensorMetal complexMetal complex-based compositeRecent advance

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Metal complexes and their composites are increasingly vital in colorimetric analysis, advancing sensor technology.
  • Their optical properties make them suitable for detecting diverse analytes, with tunable sensing capabilities based on the metal center.
  • Metal complex-based composites offer superior sensitivity and stability compared to standalone metal complexes due to nanomaterial synergy.

Purpose of the Study:

  • To review advancements in metal complex-based colorimetric sensors over the past decade.
  • To analyze these sensors from the perspectives of metal centers, composite nanomaterials, and mechanisms.
  • To identify challenges and future research directions in the field.

Main Methods:

  • Literature review focusing on metal complex-based colorimetric sensors.
  • Analysis of sensor design, composite preparation, and performance regulation.
  • Categorization based on metal centers, nanomaterials, mechanisms, and applications.

Main Results:

  • Metal complex-based composites demonstrate significantly higher sensitivity and stability in colorimetric sensing.
  • Synergistic integration with nanomaterials (metals, oxides, carbon-based) enhances sensor performance.
  • The field has seen substantial progress, but challenges in structural design and performance regulation persist.

Conclusions:

  • Metal complex-based composites represent a promising platform for advanced colorimetric sensing.
  • Further research is needed to overcome challenges in design and regulation for broader utilization.
  • Continued development is crucial for advancing colorimetric sensing applications.