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Liquid Crystals Volume 33, 2006 - Issue 6
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Original Articles

Light‐induced formation of curved needle texture by circularly polarized light irradiation on a discotic liquid crystal containing a racemic chromium complex

Nobuhiro Anzai Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 4‐24‐16 Naka‐cho, Koganei‐shi, Tokyo 184‐8588, JapanCorrespondence[email protected]
,
Hiroko Kurihara Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 4‐24‐16 Naka‐cho, Koganei‐shi, Tokyo 184‐8588, Japan
,
Masato Sone Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 4‐24‐16 Naka‐cho, Koganei‐shi, Tokyo 184‐8588, Japan
,
Hidemitsu Furukawa Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 4‐24‐16 Naka‐cho, Koganei‐shi, Tokyo 184‐8588, Japan
,
Toshiyuki Watanabe Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 4‐24‐16 Naka‐cho, Koganei‐shi, Tokyo 184‐8588, Japan
,
Kazuyuki Horie Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, 4‐24‐16 Naka‐cho, Koganei‐shi, Tokyo 184‐8588, Japan
&
Sandeep Kumar Raman Research Institute, C. V. Raman Ave., Bangalore 560 080, India
 show all
Pages 671-679 | Received 22 Nov 2005, Accepted 23 Jan 2006, Published online: 20 Feb 2007
 
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Abstract

We have found that the discotic nematic liquid crystal, hexakis(4‐nonylphenylethynyl)benzene (HNEB), doped with the racemic chromium complex Cr(Ocacac)3, shows a novel straight‐needle texture with hexagonal columnar alignments, changing to a curved‐needle texture under irradiation of circularly polarized light (CPL). This novel phenomenon is specific to the mixture of HNEB and Cr(Ocacac)3. The formation of curved needles means that chiroselective photoinversion of racemic Cr(Ocacac)3 by CPL irradiation induces a needle direction change in a discotic liquid crystal. The change in chirality of Cr(Ocacac)3 in HNEB induced by CPL irradiation, and the resulting nano‐segregation of its enantiomers during cooling from the isotropic to mesophase of HNEB, are considered to influence changes in the alignment of columns and/or small domains of column aggregates in the discotic liquid crystal.

Acknowledgements

The authors are grateful to Dr M. Tokita of Tokyo Institute of Technology for X‐ray diffraction measurements and helpful discussion.

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