An experimental and computational study of calamitic and bimesogenic liquid crystals incorporating an optically active [2,2]-paracyclophane

Richard Mandle; John William Goodby

doi:10.1080/02678292.2018.1453559

An experimental and computational study of calamitic and bimesogenic liquid crystals incorporating an optically active [2,2]-paracyclophane

Richard Mandle, John William Goodby

Chemistry

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

Abstract

Two liquid-crystalline materials containing an optically active (R)-4-hydroxy-[2,2]-paracyclophane group were prepared, one in which the chiral group is a bulky terminal unit and one in which it forms part of a terphenyl-like mesogenic unit. Both materials exhibit monotropic chiral nematic phases. Partial phase diagrams were constructed for mixtures of both materials with 5CB, allowing us to extrapolate pitch lengths and helical twisting power values (HTP) for each material.
The HTP value of the material with a ‘locked’ paracyclophane is 70% higher than that of a ‘free’ paracyclophane and this is rationalised as being due to the reduction in conformational freedom of the former material relative to the later.

Original language	English
Pages (from-to)	1567-1573
Number of pages	7
Journal	LIQUID CRYSTALS
Volume	45
Issue number	11
Early online date	22 Mar 2018
DOIs	https://doi.org/10.1080/02678292.2018.1453559
Publication status	Published - 22 Mar 2018

Bibliographical note

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10.1080/02678292.2018.1453559

An experimental and computational study of calamitic and bimesogenic liquid crystals incorporating an optically active 2 2 paracyclophane
© 2018 The Author(s).
Final published version, 1.62 MBLicence: CC BY

Nanoscale Engineering of Dyes for Liquid Crystal Dyes in Device Applications
Saez, I. M., Cowling, S. J., Goodby, J. W. & Moore, J. N.
EPSRC
1/06/15 → 30/11/18
Project: Research project (funded) › Research

Dataset for "An Experimental and Computational Study of Calamitic and Bimesogenic Liquid Crystals Incorporating an Optically Active [2,2]-Paracyclophane"
Mandle, R. (Creator) & Goodby, J. W. (Creator), University of York, 16 Mar 2018
DOI: 10.15124/ccb53be8-7646-4890-96df-1a47c60f979e
Dataset

Cite this

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title = "An experimental and computational study of calamitic and bimesogenic liquid crystals incorporating an optically active [2,2]-paracyclophane",

abstract = "Two liquid-crystalline materials containing an optically active (R)-4-hydroxy-[2,2]-paracyclophane group were prepared, one in which the chiral group is a bulky terminal unit and one in which it forms part of a terphenyl-like mesogenic unit. Both materials exhibit monotropic chiral nematic phases. Partial phase diagrams were constructed for mixtures of both materials with 5CB, allowing us to extrapolate pitch lengths and helical twisting power values (HTP) for each material.The HTP value of the material with a {\textquoteleft}locked{\textquoteright} paracyclophane is 70% higher than that of a {\textquoteleft}free{\textquoteright} paracyclophane and this is rationalised as being due to the reduction in conformational freedom of the former material relative to the later.",

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N2 - Two liquid-crystalline materials containing an optically active (R)-4-hydroxy-[2,2]-paracyclophane group were prepared, one in which the chiral group is a bulky terminal unit and one in which it forms part of a terphenyl-like mesogenic unit. Both materials exhibit monotropic chiral nematic phases. Partial phase diagrams were constructed for mixtures of both materials with 5CB, allowing us to extrapolate pitch lengths and helical twisting power values (HTP) for each material.The HTP value of the material with a ‘locked’ paracyclophane is 70% higher than that of a ‘free’ paracyclophane and this is rationalised as being due to the reduction in conformational freedom of the former material relative to the later.

AB - Two liquid-crystalline materials containing an optically active (R)-4-hydroxy-[2,2]-paracyclophane group were prepared, one in which the chiral group is a bulky terminal unit and one in which it forms part of a terphenyl-like mesogenic unit. Both materials exhibit monotropic chiral nematic phases. Partial phase diagrams were constructed for mixtures of both materials with 5CB, allowing us to extrapolate pitch lengths and helical twisting power values (HTP) for each material.The HTP value of the material with a ‘locked’ paracyclophane is 70% higher than that of a ‘free’ paracyclophane and this is rationalised as being due to the reduction in conformational freedom of the former material relative to the later.

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DO - 10.1080/02678292.2018.1453559

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ER -

An experimental and computational study of calamitic and bimesogenic liquid crystals incorporating an optically active [2,2]-paracyclophane

Abstract

Bibliographical note

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Projects

Nanoscale Engineering of Dyes for Liquid Crystal Dyes in Device Applications

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Dataset for "An Experimental and Computational Study of Calamitic and Bimesogenic Liquid Crystals Incorporating an Optically Active [2,2]-Paracyclophane"

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