Tristriazolotriazines with azobenzene arms : acidochromic dyes and discotic liquid crystals
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Abstract
Tristriazolotriazines with azobenzene substitution and peripheral alkoxy- or alkylamino chains were prepared from the corresponding aryltetrazoles and cyanuric chloride. These star-shaped dyes are highly acidochromic. Alkoxy-substitution allows reversible trans-cis photoswitching. Compounds with a 3,4-dialkoxy substitution are discotic liquid crystals that form broad and stable thermotropic mesophases. The thermal behavior was studied by DSC and polarizing optical microscopy.
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European journal of organic chemistry, 2019, 29, Wiley-VCH Verl., Weinheim, 2019, https://doi.org/10.1002/ejoc.201900665