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Anisyl-methoxy Substituted Coumarin Derivatives as Fluorescent Sensors for Detection of Hazardous Nitroaromatics:

Subhani Khanam Nehal1, Renuka Uppar1, Vibha Karkihalli2

  • 1Department of Studies in Physics, Vijayanagara Sri Krishnadeveraya University, Ballari, Karnataka, 583 105, India.

Journal of Fluorescence
|May 13, 2026
PubMed

Keywords:
Coumarin derivativesFluorescence quenchingFluorescence sensorsNitroaromatic compoundsStern-Volmer analysis

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Physical Properties of Amines

Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
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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 para position.
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