Optically Active Bimesogens Incorporating Branched Central Spacers

Richard Mandle; John William Goodby

doi:10.1039/C8RA02075B

Optically Active Bimesogens Incorporating Branched Central Spacers

Richard Mandle, John William Goodby

Chemistry

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	18542-18548
Number of pages	7
Journal	RSC Advances
Volume	8
DOIs	https://doi.org/10.1039/C8RA02075B
Publication status	Published - 22 May 2018

Bibliographical note

Access to Document

10.1039/C8RA02075B

45 - RSC adv, chiral dimers, 2018 (print)
© The Royal Society of Chemistry 2018
Final published version, 828 KBLicence: CC BY

Cite this

@article{fac25b35efc742f4ae532582f78fc30f,

title = "Optically Active Bimesogens Incorporating Branched Central Spacers",

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. ",

author = "Richard Mandle and Goodby, {John William}",

note = "{\textcopyright} The Royal Society of Chemistry 2018",

year = "2018",

month = may,

day = "22",

doi = "10.1039/C8RA02075B",

language = "English",

volume = "8",

pages = "18542--18548",

journal = "RSC Advances",

issn = "2046-2069",

publisher = "The Royal Society of Chemistry",

}

TY - JOUR

T1 - Optically Active Bimesogens Incorporating Branched Central Spacers

AU - Mandle, Richard

AU - Goodby, John William

PY - 2018/5/22

Y1 - 2018/5/22

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85047473413&partnerID=8YFLogxK

U2 - 10.1039/C8RA02075B

DO - 10.1039/C8RA02075B

M3 - Article

SN - 2046-2069

VL - 8

SP - 18542

EP - 18548

JO - RSC Advances

JF - RSC Advances

ER -

Optically Active Bimesogens Incorporating Branched Central Spacers

Abstract

Bibliographical note

Access to Document

Other files and links

Nanoscale Engineering of Dyes for Liquid Crystal Dyes in Device Applications

Dataset for: Optically Active Bimesogens Incorporating Branched Central Spacers

Cite this

Optically Active Bimesogens Incorporating Branched Central Spacers

Abstract

Bibliographical note

Access to Document

Other files and links

Projects

Nanoscale Engineering of Dyes for Liquid Crystal Dyes in Device Applications

Datasets

Dataset for: Optically Active Bimesogens Incorporating Branched Central Spacers

Cite this