Liquid crystalline properties of 4-alkoxy-4'-bromoazobenzenes

Zbigniew Galewski

doi:10.1117/12.215544

2 August 1995 Liquid crystalline properties of 4-alkoxy-4'-bromoazobenzenes

Zbigniew Galewski

Proceedings Volume 2372, Liquid Crystals: Materials Science and Applications; (1995) https://doi.org/10.1117/12.215544
Event: Liquid Crystals: Materials Science and Applications, 1994, Zakopane, Poland

Abstract

A new family of liquid crystalline compound with the general formula C_nH_2n+1ON₂Br has been synthesized, for n equal to 1 until 12 (methyl until dodecyl groups). In this family starting from pentyl derivative smectic A mesophase has been identified. For pentyl, hexyl, and heptyl derivatives, an extra monotropic smectic E was found. For pentyl until dodecyl, except undecyl derivatives, interesting heat anomalies were found by DTA and DSC calorimetry. They are interpreted as a phase transition into unknown smectic X. The influence of the structure on the phase sequence is discussed and compared to similar families: 4-chloro-4'-alkoxyazobenzenes and 4-bromobenzylidene-4'- alkoxyanilines.

Citation Download Citation

Zbigniew Galewski "Liquid crystalline properties of 4-alkoxy-4'-bromoazobenzenes", Proc. SPIE 2372, Liquid Crystals: Materials Science and Applications, (2 August 1995); https://doi.org/10.1117/12.215544

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