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Optically Active Bimesogens Incorporating Branched Central Spacers

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JournalRSC Advances
DateSubmitted - 2 May 2018
DateAccepted/In press - 14 May 2018
DatePublished (current) - 22 May 2018
Volume8
Number of pages7
Pages (from-to)18542-18548
Original languageEnglish

Abstract

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.

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© The Royal Society of Chemistry 2018

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