Related Experiment Video
Updated: Aug 24, 2025
10:57
Experimental Protocol for Detecting Cyanobacteria in Liquid and Solid Samples with an Antibody Microarray Chip
Published on: February 7, 2017
9.2K
A colorimetric supramolecular sensor array based on charge-transfer complexes for multiplex aniline and phenolic
Shu-Zhen Huang1, Qing Tang2, Kai-Ni Wei1
1Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang, 550025, China.
Analytica Chimica Acta
|October 25, 2022
Summary
A novel supramolecular colorimetric sensor rapidly detects and distinguishes similar aniline and phenol pollutants in sewage. This method offers a sensitive and convenient approach for environmental monitoring of complex chemical mixtures.
Area of Science:
- Analytical Chemistry
- Environmental Science
- Materials Science
Background:
- Monitoring toxic substances in sewage is crucial for environmental protection.
- Detecting structurally similar pollutants poses significant analytical challenges.
- Existing methods may lack the speed and sensitivity required for real-time monitoring.
Purpose of the Study:
- To develop a rapid and highly sensitive sensor for detecting complex pollutants in sewage discharge.
- To create a supramolecular colorimetric array sensor capable of distinguishing structurally similar aniline and phenol isomers.
- To establish a convenient method for identifying and quantifying these pollutants in real environmental samples.
Main Methods:
- Construction of a supramolecular colorimetric array sensor based on charge-transfer complex formation.
- Utilizing visual color changes under natural light for detection.
- Applying Linear Discriminant Analysis (LDA) for isomer recognition and categorization.
- Employing Total Euclidean Distance (TED) for quantitative analysis.
- Verification using Proton Nuclear Magnetic Resonance (¹H NMR) spectroscopy.
Main Results:
- The sensor successfully produced distinct color changes for six aniline and phenol isomers.
- LDA effectively recognized and distinguished between these isomers and their mixtures.
- A good linear correlation was observed between TED and pollutant concentrations.
- Achieved a low detection limit (LOD) in the range of 10⁻⁵–10⁻⁶ mol L⁻¹.
- Successfully identified isomers in real sewage samples.
Conclusions:
- The developed supramolecular colorimetric array sensor provides a fast, sensitive, and convenient method for detecting complex pollutants.
- Charge-transfer complex formation within the Q[8] cavity is identified as the mechanism for color change.
- This sensor offers a practical solution for monitoring toxic substances in sewage discharge, addressing a critical environmental problem.
Related Concept Videos
00:39Complexometric Titration: Overview
7.5K
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...
7.5K
00:43Complexometric 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
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
3.1K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
3.1K