Structural factors controlling the transition between columnar-hexagonal and helical mesophase in triphenylene liquid crystals

Andrew N Cammidge; Hemant Gopee

doi:10.1039/B103450M

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Andrew N Cammidge*^a and Hemant Gopee^a

Author affiliations

* Corresponding authors

^a School of Chemical Sciences, University of East Anglia, Norwich, UK
E-mail: a.cammidge@uea.ac.uk

Abstract

A series of novel triphenylenes has been synthesised by a combination of palladium catalysed coupling, oxidative cyclisation, bromination and nucleophilic aromatic substitution. The new derivatives are designed to have structures which are intermediate between the known symmetrical materials hexakis(hexyloxy)triphenylene and hexakis(hexylthio)triphenylene. The compounds having four hexyloxy and two hexylthio substituents form only Col_h mesophases. Triphenylenes having four hexylthio and two hexyloxy substituents also give Col_h mesophases but 3,6-bis(hexyloxy)-2,7,10,11-tetrakis(hexylthio)triphenylene 5 is unique in that it cools into a stable, more ordered phase. The low temperature phase, which appears to be indefinitely stable at ambient temperature, is assumed to be helical based on transition enthalpy data.

This article is part of the themed collection: Molecular topology in liquid crystals: Materials Discussion 4

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Article information

DOI: https://doi.org/10.1039/B103450M
Article type: Paper
Submitted: 18 Apr 2001
Accepted: 22 May 2001
First published: 02 Oct 2001

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J. Mater. Chem., 2001,11, 2773-2783

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