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Liquid Crystals Volume 32, 2005 - Issue 10
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Original Articles

Synthesis and mesomorphic properties of new chiral banana‐shaped liquid crystals with chiral 3‐(alkoxy)propoxy terminal groups

Seng Kue Lee Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Pusan 609‐735, Korea
,
Chang Won Park Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Pusan 609‐735, Korea
,
Jong Gun Lee Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Pusan 609‐735, Korea
,
Kyung‐Tae Kang Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Pusan 609‐735, KoreaCorrespondence[email protected]
,
Koushi Nishida Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O‐okayama 2‐12‐1, Meguro‐ku, Tokyo 152‐8552, Japan
,
Yoshio Shimbo Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O‐okayama 2‐12‐1, Meguro‐ku, Tokyo 152‐8552, Japan
,
Yoichi Takanishi Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O‐okayama 2‐12‐1, Meguro‐ku, Tokyo 152‐8552, Japan
&
Hideo Takezoe Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O‐okayama 2‐12‐1, Meguro‐ku, Tokyo 152‐8552, Japan
 show all
Pages 1205-1212 | Published online: 20 Feb 2007
 
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Abstract

New chiral banana‐shaped liquid crystals with chiral 3‐(alkoxy)propoxy terminal groups (Pn‐O‐PIMB5*‐4O, n = 7, 8, 9 and 10) were synthesized and their mesomorphic properties and phase structures investigated by means of electro‐optic measurements, polarizing optical microscopy, differential scanning calorimetry, and second harmonic generation measurements. Most of these chiral bent‐core mesogens (n = 7–9) showed the antiferroelectric B2 phase, whereas P10‐O‐PIMB5*‐4O exhibited the B7 phase. Comparing with the previously reported homologue Pn‐O‐PIMB(n‐2)*, we conclude that the terminal chain structure, particularly the position of chiral centres, plays an important role in the emergence of particular phase structures.

Acknowledgements

This work is partly supported by Grant‐in‐Aid for Scientific Research (S) (16105003) from the Ministry of Education, Science, Sports and Culture of Japan. The stay of S. K. L. is supported by JSPS through the TIT‐KAIST core university collaboration program. K. T. K. acknowledges PNU for financial support.

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