Non-symmetrical liquid crystal dimers armed with azobenzene and 1,2,3-triazole-cholesterol

Arwa Alshargabi, Guan Yeow Yeap*, Wan Ahmad Kamil Mahmood, Chun Chieh Han, Hong-Cheu Lin, Daisuke Takeuchi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


New non-symmetrical dimers which contain respective side units of azobenzene and 1,2,3-triazole-choloesteral have been synthesised from the reaction between 6-azido-[4-(4-acetylphenylazo)phenoxy]alkane and cholesteryl-4-(prop-2-ynyloxy)benzoate. The results show that the derivatives of 6-bromo[4-(4-acetylphenylazo)phenoxy]alkanes which possess the odd alkyl spacers exhibit dimesomorphism of N and SmA phases whilst the members with even numbers are non-mesogenic. However, the 6-azido-[4-(4-acetylphenylazo)phenoxy]-alkanes show N and SmA phases in a wide temperature range. On heating and cooling the target compounds cholesteryl 4-[(1-(6-(4-(4ʹ-acetylphenylazo)phenoxy)alkyl)-1H-1,2,3-triazol-4-yl)methoxy]benzoate show chiral nematic (oily streak and fan-shaped texture) and focal conic texture characteristics of smectic A phases with high thermal stability. Present investigation also reveals the effect of the spacer length upon the phase transition temperature. Intercalated arrangement is favoured by the molecules in the smectic phase. The observation is well established by XRD measurement wherein the actual molecular length is smaller than the theoretical value.

Original languageEnglish
Pages (from-to)1337-1349
Number of pages13
JournalLiquid Crystals
Issue number9
StatePublished - 2 Sep 2015


  • 1,2,3-triazole-cholesterol
  • azobenzene
  • chiral nematic
  • non-symmetrical liquid crystals
  • smectic

Fingerprint Dive into the research topics of 'Non-symmetrical liquid crystal dimers armed with azobenzene and 1,2,3-triazole-cholesterol'. Together they form a unique fingerprint.

Cite this