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In the current fascination with liquid crystalline dimers, bimesogens and oligomers the role of the central spacer in these systems has perhaps been somewhat neglected. In compound 1, a phenyl 4-cyanobenzoate bimesogen, the central spacer incorporates a methyl group at the 2- position and is therefore chiral. The helical twisting power of 1, measured in both 5CB and E7, was found to be 0.36 and 0.35 μm-1 wt%-1 respectively. Compound 1 exhibited a monotropic chiral nematic phase, however no twist-bend modulated phase was observed. We prepared a number of analogues of 1 incorporating different mesogenic units and observe that those with a small aspect ratio are non mesogenic, whereas those with larger aspect ratios variously exhibit chiral nematic, TB, SmC and SmB phases.
|Number of pages||7|
|Publication status||Published - 22 May 2018|
Bibliographical note© The Royal Society of Chemistry 2018
- 1 Finished
Nanoscale Engineering of Dyes for Liquid Crystal Dyes in Device Applications
Saez, I. M., Cowling, S. J., Goodby, J. W. & Moore, J. N.
1/06/15 → 30/11/18
Project: Research project (funded) › Research
Dataset for: Optically Active Bimesogens Incorporating Branched Central Spacers
Mandle, R. (Creator) & Goodby, J. W. (Creator), University of York, 2 May 2018