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4,4′‐Distyrylazobenzol als Mesogen
Author(s) -
Kosteyn Frank,
Zerban Georg,
Meier Herbert
Publication year - 1992
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19921250421
Subject(s) - mesogen , thermotropic crystal , chemistry , differential scanning calorimetry , sequence (biology) , crystallography , stereochemistry , polymer chemistry , liquid crystalline , organic chemistry , phase (matter) , biochemistry , thermodynamics , physics
4,4′‐Distyrylazobenzene as Mesogen From 3,4‐dihydroxybenzaldehyde ( 1 ) the tetraalkoxy‐substituted 4,4′‐distyrylazobenzenes ( E,E,E )‐ 5a – c are synthesized. A similar reaction sequence leads from ethyl 3,4,5‐trihydroxy‐benzoate ( 6 ) to the hexaalkoxy‐substituted 4,4′‐distyrylazobenzenes ( E,E,E )‐ 11 b, c. With the exception of 5a all products show thermotropic LC properties. Smectic phases have been characterized by polarizing microscopy and by differential scanning calorimetry.