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Development of photostable near-infrared cyanine dyes

Animesh Samanta1, Marc Vendrell, Rajkumar Das

  • 1Department of Chemistry & MedChem Program of Life Sciences Institute, National University of Singapore, 117543, Singapore.

Chemical Communications (Cambridge, England)
|September 11, 2010
PubMed

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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.