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Missing Link between Helical Nano‐ and Microfilaments in B4 Phase Bent‐Core Liquid Crystals, and Deciphering which Chiral Center Controls the Filament Handedness

Shadpour, Sasan; Nemati, Ahlam; Salamończyk, Mirosław; Prévôt, Marianne E.; Liu, Jiao; Boyd, Nicola J.; Wilson, Mark R.; Zhu, Chenhui; Hegmann, Elda; Jákli, Antal I.; Hegmann, Torsten

Missing Link between Helical Nano‐ and Microfilaments in B4 Phase Bent‐Core Liquid Crystals, and Deciphering which Chiral Center Controls the Filament Handedness Thumbnail


Authors

Sasan Shadpour

Ahlam Nemati

Mirosław Salamończyk

Marianne E. Prévôt

Jiao Liu

Nicola J. Boyd

Chenhui Zhu

Elda Hegmann

Antal I. Jákli

Torsten Hegmann



Abstract

The range of possible morphologies for bent‐core B4 phase liquid crystals has recently expanded from helical nanofilaments (HNFs) and modulated HNFs to dual modulated HNFs, helical microfilaments, and heliconical‐layered nanocylinders. These new morphologies are observed when one or both aliphatic side chains contain a chiral center. Here, the following questions are addressed: which of these two chiral centers controls the handedness (helicity) and which morphology of the nanofilaments is formed by bent‐core liquid crystals with tris‐biphenyl diester core flanked by two chiral 2‐octyloxy side chains? The combined results reveal that the longer arm of these nonsymmetric bent‐core liquid crystals controls the handedness of the resulting dual modulated HNFs. These derivatives with opposite configuration of the two chiral side chains now feature twice as large dimensions compared to the homochiral derivatives with identical configuration. These results are supported by density functional theory calculations and stochastic dynamic atomistic simulations, which reveal that the relative difference between the para‐ and meta‐sides of the described series of compounds drives the variation in morphology. Finally, X‐ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM) data also uncover the new morphology for B4 phases featuring p2/m symmetry within the filaments and less pronounced crystalline character.

Journal Article Type Article
Acceptance Date Dec 9, 2019
Online Publication Date Dec 29, 2019
Publication Date Jan 28, 2020
Deposit Date Jan 4, 2020
Publicly Available Date Dec 29, 2020
Journal Small
Print ISSN 1613-6810
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 16
Issue 4
Article Number 1905591
DOI https://doi.org/10.1002/smll.201905591
Public URL https://durham-repository.worktribe.com/output/1280672

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Copyright Statement
This is the accepted version of the following article: Shadpour, Sasan Nemati, Ahlam Salamończyk, Mirosław Prévôt, Marianne E. Liu, Jiao Boyd, Nicola J. , Wilson, Mark R. , Zhu, Chenhui Hegmann, Elda Jákli, Antal I. & Hegmann, Torsten (2020). Missing Link between Helical Nano‐ and Microfilaments in B4 Phase Bent‐Core Liquid Crystals, and Deciphering which Chiral Center Controls the Filament Handedness. Small 16(4): 1905591 which has been published in final form at https://doi.org/10.1002/smll.201905591. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for self-archiving.






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