Dr Ewan Cruickshank e.cruickshank2@rgu.ac.uk
Lecturer
The influence of molecular shape and electronic properties on the formation of the ferroelectric nematic phase.
Cruickshank, Ewan; Tufaha, Naila; Walker, Rebecca; Brown, Stevie; Gorecka, Ewa; Pociecha, Damian; Storey, John M.D.; Imrie, Corrie T.
Authors
Naila Tufaha
Rebecca Walker
Stevie Brown
Ewa Gorecka
Damian Pociecha
John M.D. Storey
Corrie T. Imrie
Abstract
The synthesis and characterisation of two series of ferroelectric nematogens based on RM734 having an additional methoxy group on the central phenyl ring are reported, the 3-methoxy-4-((4-nitrophenoxy)carbonyl)phenyl 2-alkoxy-4-alkoxybenzoates (7-m-n) and the 3-methoxy-4-((3-fluoro-4-nitro-phenoxy)carbonyl)phenyl 2-alkoxy-4-alkoxybenzoates (8-m-n). In order to compare the behaviour of these series to those of the corresponding materials that do not contain the methoxy group on the central phenyl ring, we also report the synthesis and characterisation of 4-[(4-nitrophenoxy)carbonyl] phenyl 4-methoxybenzoate (11-0-1), 4-[(3-fluoro-4-nitrophenoxy)carbonyl]phenyl 4-methoxybenzoate (12-0-1) and 4-[(3-fluoro-4-nitrophenoxy)carbonyl]phenyl 2,4-diethoxybenzoate (12-2-2). Two compounds in which a lateral ethoxy chain is attached to the central ring, 3-ethoxy-4-[(4-nitrophenoxy)carbonyl]phenyl 2,4-dimethoxybenzoate (18-2-1) and 3-ethoxy-4-[(3-fluoro-4-nitrophenoxy) carbonyl]phenyl 2,4-dimethoxybenzoate (19-2-1), are also described. The behaviour of these materials shows that the relative stabilities of the ferroelectric nematic, NF, and conventional nematic, N, phases are governed by a subtle interplay of steric and electronic factors. Furthermore, the electronic factors are better understood in terms of isolated regions of electron density rather than by a single large longitudinal dipole moment. In terms of molecular shape, to observe the NF phase it appears that the molecular structure must include one or more lateral substituents that enhance molecular biaxiality and destabilise the N phase.
Citation
CRUICKSHANK, E., TUFAHA, N., WALKER, R., BROWN, S., GORECKA, E., POCIECHA, D., STOREY, J.M.D. and IMRIE, C.T. The influence of molecular shape and electronic properties on the formation of the ferroelectric nematic phase. Liquid crystals [online], Latest Articles. Available from: https://doi.org/10.1080/02678292.2024.2304598
Journal Article Type | Article |
---|---|
Acceptance Date | Jan 2, 2024 |
Online Publication Date | Jan 25, 2024 |
Deposit Date | Jan 26, 2024 |
Publicly Available Date | Jan 29, 2024 |
Journal | Liquid crystals |
Print ISSN | 0267-8292 |
Electronic ISSN | 1366-5855 |
Publisher | Taylor and Francis |
Peer Reviewed | Peer Reviewed |
DOI | https://doi.org/10.1080/02678292.2024.2304598 |
Keywords | Ferroelectric nematic phase; Fluorine; Lateral substituents; Liquid crystals; Nematic phase |
Public URL | https://rgu-repository.worktribe.com/output/2218701 |
Related Public URLs | https://rgu-repository.worktribe.com/output/2225335 (Data containing supplementary material from journal article) |
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CRUICKSHANK 2024 The influence of molecular (VOR)
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Copyright Statement
© 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Version
Latest Article uploaded 2024.01.29
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