Heterocyclic polycatenar liquid crystals

Catherine Fang He, Gary J. Richards, Stephen M. Kelly, Adam E.A. Contoret, Mary O'Neill

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

We report the synthesis of polycatenar liquid crystals incorporating 2,5-disubstituted 1 3 4-oxadiazole and 1 3 4-thiadiazole rings joined by a combination of carbon-carbon single and double bonds (-CH = CH-). The ratio of the aromatic core to the aliphatic chains was varied systematically by changing the number of the aliphatic chains, from two to six, and their length, from short to very long, i.e. from methoxy to hexadecyloxy. The shape anisotropy of the core was varied by exchanging the oxygen atom in the 1 3 4-oxadiazole for a sulfur atom to form the corresponding 1 3 4-thiadiazole ring with a smaller deviation from coaxiality of the bonds in the 2,5-positions. The shape anisotropy of the core was increased by the presence of an additional phenylenevinylene unit in a series of tetracatenar oxadiazoles. We report the synthesis, physical properties and polymerization of a polycatenar reactive mesogen in a columnar phase to form a polycatenar polymer network.

Original languageEnglish
Pages (from-to)1249-1267
Number of pages19
JournalLiquid Crystals
Volume34
Issue number11
DOIs
Publication statusPublished - 2007 Nov
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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