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Phenomenological analysis of the light intensity dependence of the photoalignment process in azo-containing polymeric

L T Thieghi1, F Batalioto, I H Bechtold

  • 1Instituto de Física, Universidade de São Paulo, P. O. Box 66318, São Paulo 05389-970, SP, Brazil.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 16, 2006
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.