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Issue 21, 2009
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Polycatenar bows with single carbon atom elbow

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A new family of six aromatic ring-containing bent-shaped mesogens in which the central elbow is a ketone, a secondary alcohol or a methylene group (6: C[double bond, length as m-dash]O, 7: CHOH, 8: CH2) is described. The effects of the variant elbow as well as the number of terminal alkoxy chains on the mesomorphic properties have been studied. The results showed that, except for two compounds deprived of mesomorphism, all the other bent derivatives were found to exhibit mesophases. All the dicatenar compounds are mesomorphic, and depending on whether the central joint is planar or tetrahedral, they display either a SmC phase or a B1/B1rev phase, respectively. Mesomorphism is suppressed in the two tetracatenars with a tetrahedral elbow while all the other polycatenars show a columnar phase with a 2D hexagonal symmetry. The investigation revealed that not only did the flexibility of the elbow and the number of terminal chains have a strong impact on mesogenic behaviour but the proper combination of these structural factors can lead towards axially polar columnar phases.

Graphical abstract: Polycatenar bows with single carbon atom elbow

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Article information

21 May 2009
15 Jul 2009
First published
21 Aug 2009

Soft Matter, 2009,5, 4231-4239
Article type

Polycatenar bows with single carbon atom elbow

A. Lesac, B. Donnio and D. Guillon, Soft Matter, 2009, 5, 4231
DOI: 10.1039/B910123C

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