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Molecular Crystals and Liquid Crystals Volume 439, 2005 - Issue 1
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Original Articles

Calamitic Liquid Crystalline Molecules with Lateral Intermolecular Hydrogen Bonding

Shigeo Kohmoto Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, Inage-ku, Chiba, Japan
,
Makoto Yamamoto Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, Inage-ku, Chiba, Japan
,
Keiki Kishikawa Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, Inage-ku, Chiba, JapanCorrespondence[email protected]
&
Takashi Kajitani Quality Materials Science, Graduate School of Science and Technology, Chiba University, Inage-ku, Chiba, Japan
Pages 173/[2039]-177/[2043] | Published online: 31 Aug 2006
 
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ABSTRACT

Calamitic liquid crystalline amides 1–3 were synthesized and their thermodynamic behaviors were investigated. Bent-rod shaped compound 1 exhibited a usual smectic C phase. On the other hand, in the case of straight-rod compound 2, two kinds of smectic C phases (SmCx and SmCy) were observed above the crystal phase. Although SmCy phase belonged to general smectic C phases, SmCx phase exhibited very sharp lines in its schlieren textures. As the packing model of smectic Cx phase, a lateral linear arrangement of the molecules was proposed to explain the difference between these smectic C phases. Additionally, in the case of 3 which has a flexible spacer between its amide group and straight rodlike core, the molecules generated the highly ordered smectic C (3a, SmCx) and a chiral cubic phase (3b).

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