Synthesis and Phase Behavior of Chiral Liquid Crystalline Compounds with the Structure of L-Amino Acid Derivative

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (9): 1385.

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Synthesis and Phase Behavior of Chiral Liquid Crystalline Compounds with the Structure of L-Amino Acid Derivative

ZHANG Xian-Liang¹, SHAN Da-Qing¹, CAO Lian-Xin², LIU Qi-Cai², ZHUO Ren-Xi¹

1. Department of Chemistry Wuhan University, Wuhan, 430072;
2. Test Center Wuhan University, Wuhan, 430072

Received:1994-09-12 Revised:1995-03-15 Online:1995-09-24 Published:1995-09-24

Abstract

Abstract: Nine mesogenic compounds(I-Ⅲ, Ⅳ_a,b,V_a,b,Ⅵ_a,b) with the structure of Lamino acid derivative, four L-amino derivatives (A_1-4) and six mesogenic compounds (M_1-6) were synthesized.The chemical structure of new compounds (I-Ⅲ,Ⅳ_a,b,V_a,b,Ⅵ_a,b,A₄and M_3-6)were confirmed by IR, ¹HNMR and elemental analysis.Their phase behavior was also investigated by using differential scanning calorimetry (DSC) and polarizing microscopy, The resultis show that eight compounds(M_3-6,Ⅳ_a,b,V_band Ⅵ_b) exhibit the liquid crystalline plase transtion temperatures,The specific rotation of the compounds was also determined.X-Ray diffraction had been used to investigate smectic structure of two compounds,the results show that compounds(Ⅳ_b,Ⅵ_b) exhibit S_C^*and S_E^*respectively.The hysteresis loop of Ⅳ_bwere determined, it is proved that Ⅵ_bdo have ferroelectricity.

Key words: Liquid crystalline (LC), L-Amino acid, Chiral, Synthesis, Phase transition behavior

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ZHANG Xian-Liang, SHAN Da-Qing, CAO Lian-Xin, LIU Qi-Cai, ZHUO Ren-Xi. Synthesis and Phase Behavior of Chiral Liquid Crystalline Compounds with the Structure of L-Amino Acid Derivative[J]. Chem. J. Chinese Universities, 1995, 16(9): 1385.

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Synthesis and Phase Behavior of Chiral Liquid Crystalline Compounds with the Structure of L-Amino Acid Derivative

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