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Tristriazolotriazines with Azobenzene Arms ‐ Acidochromic Dyes and Discotic Liquid Crystals
Author(s) -
Sperner Marcel,
Tober Natalie,
Detert Heiner
Publication year - 2019
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.201900665
Subject(s) - azobenzene , thermotropic crystal , alkoxy group , chemistry , discotic liquid crystal , liquid crystal , cyanuric chloride , optical microscope , crystallography , substitution (logic) , photochemistry , polymer chemistry , alkyl , organic chemistry , polymer , liquid crystalline , molecule , materials science , scanning electron microscope , optoelectronics , computer science , composite material , programming language
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.