Issue 38, 2012
From the journal:

Journal of Materials Chemistry

Hybrid rod-like and bent-core liquid crystal dimers exhibiting biaxial smectic A and nematic phases

Yan Wang,a   Hyung Guen Yoon,a   Hari Krishna Bisoyi,a   Satyendra Kumara  and  Quan Li*a  

* Corresponding authors

a Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA
E-mail: qli1@kent.edu
Fax: +1-330-672-2796
Tel: +1-330-672-1537

Abstract

Liquid crystal hybrid dimers involving bent-core units and rod-like units were designed, synthesized and investigated by a combination of polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction studies. All the four unsymmetrical dimers 1–4 exhibited stable nematic phases over a wide temperature range. Moreover, dimer 1 exhibited the biaxial smectic A (SmA) phase and dimer 2 exhibited a highly ordered mesophase below the nematic (N) phase. Two rod-like and bent-core nematogenic units were covalently linked in dimers 3 and 4 to furnish exclusively the nematic phase. The observation of the biaxial SmA phase underlying the nematic phase in one of the bent-core–rod dimers 1 would be a significant step forward towards achieving the biaxial nematic phase and resolving controversies related to the presence of cybotactic groups.

Graphical abstract: Hybrid rod-like and bent-core liquid crystal dimers exhibiting biaxial smectic A and nematic phases

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Article information

DOI
https://doi.org/10.1039/C2JM34315K
Article type
Paper
Submitted
04 Jul 2012
Accepted
09 Aug 2012
First published
09 Aug 2012

J. Mater. Chem., 2012,22, 20363-20367

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Hybrid rod-like and bent-core liquid crystal dimers exhibiting biaxial smectic A and nematic phases

Y. Wang, H. G. Yoon, H. K. Bisoyi, S. Kumar and Q. Li, J. Mater. Chem., 2012, 22, 20363 DOI: 10.1039/C2JM34315K

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