Molecular shape as a means to control the incidence of the nanostructured twist bend phase

Liquid crystalline phases with a spontaneous twist-bend modulation are most commonly observed for dimers and bimesogens with nonamethylene spacers. In order to redress this balance we devised a simple chemical intermediate that can be used to prepare unsymmetrical bimesogens; as a proof of concept w...

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Bibliographic Details
Published in:Soft matter 2018, Vol.14 (13), p.2508-2514
Main Authors: Pocock, Emily E, Mandle, Richard J, Goodby, John W
Format: Article
Language:English
Subjects:
Computer applications
Dimers
Incidence
Liquid crystals
Phase transitions
Spacer
Thermal stability
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Summary:Liquid crystalline phases with a spontaneous twist-bend modulation are most commonly observed for dimers and bimesogens with nonamethylene spacers. In order to redress this balance we devised a simple chemical intermediate that can be used to prepare unsymmetrical bimesogens; as a proof of concept we prepared and studied eleven novel materials with all found to exhibit the twist-bend phase and exhibit a linear relationship between TN-I and TTB-N. A computational study of the conformational landscape reveals the octamethyleneoxy spacer to have a broader distribution of bend-angles than the nonamethylene equivalent, leading to reductions in the thermal stability of the TB phase. This result indicates that a tight distribution of bend-angles should stabilise the TB phase and lead to direct TB-Iso phase transitions, and conversely a broader distribution should destabilise the TB phase which may allow new states of matter that are occluded by the incidence of this phase to be revealed.
ISSN:1744-683X
1744-6848
DOI:10.1039/c7sm02364b