Issue 47, 2012
From the journal:

Journal of Materials Chemistry

The locally polar smectic A phase in V-shaped molecules

E-Joon Choi,*a   Eun-Chol Kim,a   Sang-Byung Park,b   Wang-Cheol Zin,b   You-Jin Leec  and  Jae-Hoon Kimc  

* Corresponding authors

a Department of Polymer Science and Engineering, Kumoh National Institute of Technology, Gumi, Gyungbuk 730-701, Korea
E-mail: ejchoi@kumoh.ac.kr
Fax: +82 544787710
Tel: +82 544787684

b Department of Material Science and Engineering, Pohang University of Science and Technology, Pohang, Gyungbuk 790-784, Korea

c Department of Information Display Engineering, Department of Electronics and Communications Engineering, Hanyang University, Seoul, Korea

Abstract

For focusing on the polar smectic A phase derived from the V-shaped molecules, bent-core molecules with an acute-angled central core (Ar = 1,2-phenylene or 2,3-naphthylene) and a lateral halogen substituent (X = F or Cl) were synthesized. Their mesomorphic properties were investigated by DSC, polarizing microscopy, X-ray and electro-optical measurements. We found that a compound with Ar/X = 2,3-naphthylene/Cl forms the conventional smectic A phase, whereas three compounds with Ar/X = 1,2-phenylene/F, 1,2-phenylene/Cl and 2,3-naphthylene/F form the locally polar smectic A phase (SmAPR). According to our knowledge this is the first obvious experimental evidence that V-shaped molecules with an acute-subtended angled central core, in cooperation with a lateral halogen substituent, can form the SmAPR.

Graphical abstract: The locally polar smectic A phase in V-shaped molecules

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Article information

DOI
https://doi.org/10.1039/C2JM35530B
Article type
Paper
Submitted
15 Aug 2012
Accepted
01 Oct 2012
First published
01 Oct 2012

J. Mater. Chem., 2012,22, 24930-24935

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The locally polar smectic A phase in V-shaped molecules

E. Choi, E. Kim, S. Park, W. Zin, Y. Lee and J. Kim, J. Mater. Chem., 2012, 22, 24930 DOI: 10.1039/C2JM35530B

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