Synthesis and Mesomorphic Properties of 4,4′-Di(n-Alkyl)Stilbenes

Z. Belarbi-massouras Department of Functional Polymer Science, Faculty of Textile Science & Technology, Shinshu University, Ueda, 386, Japan

A. Takagi Department of Functional Polymer Science, Faculty of Textile Science & Technology, Shinshu University, Ueda, 386, Japan

H. Ema Department of Functional Polymer Science, Faculty of Textile Science & Technology, Shinshu University, Ueda, 386, Japan

H. Hasebe Department of Functional Polymer Science, Faculty of Textile Science & Technology, Shinshu University, Ueda, 386, Japan

K. Ohta Department of Functional Polymer Science, Faculty of Textile Science & Technology, Shinshu University, Ueda, 386, Japan

T. Fujimoto Department of Functional Polymer Science, Faculty of Textile Science & Technology, Shinshu University, Ueda, 386, Japan

I. Yamamoto Department of Functional Polymer Science, Faculty of Textile Science & Technology, Shinshu University, Ueda, 386, Japan

G. Massouras Government Industrial Research Institute, Nagoya, 1 Hiratecho, Kita-ku, Nagoya, 462, Japan

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Abstract

A new synthetic method to obtain only trans-isomers of 4,4′-di(n-alkyl)stilbenes is reported. It was found that these series of alkyl-substituted stilbenes exhibit two and three mesophases for n = 8, 9 and 10 and n = 11 and 12 respectively. The identification of the liquid crystalline phases has been carried out by miscibility tests, microscopic observations and X-ray measurements. The present study shows that all mesophases are characterized by a monolayer structure with either a pseudohexagonal (S_G) or a herringbone (S_H) arrangement of the molecular planes.

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Synthesis and Mesomorphic Properties of 4,4′-Di(n-Alkyl)Stilbenes

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Synthesis and Mesomorphic Properties of 4,4′-Di(n-Alkyl)Stilbenes

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