- 作者: Hui-Chen Lee, Ming-Jing Hsie, Shu-Wen Yeh, Pao-Swu Cheng and Wen-Liang Tsai*
- 作者服務機構: Department of Chemistry, National Kaohsiung Normal University, Kaohsiung 802, Taiwan, R.O.C.
- 中文摘要: Two new chiral alcohols, 2(S)-[2R-methylhexyloxy]propanol (5) and 2(S)-[2(S)-methylhexyloxy]propanol (6), were prepared from the corresponding propionic acid ethyl ester 1 and 2 in the presence of sodium borohydride. They were used as the chiral moiety for the synthesis of two diastereomeric liquid crystals 7 and 8. Both of them exhibit the phase sequence I-SmA-SmC*-SmX-Cr. The mesogenic properties of the (S,S)-diastereomer 8 are more unique in comparison with those of the (S,R)-diastereomer 7. It possesses not only lower SmA and SmC* phase transition temperature, 103 °C vs. 112 °C for SmA phase and 31 °C vs. 65 °C for SmC* phase, but wider SmA and SmC* phase range, 40 °C vs. 31 °C for SmA phase and 72 °C vs. 47 °C for SmC* phase. The diastereomer 8 also has a larger Ps value than that of 7, 24 vs. 15 nC cm-2 measured at Tc - T = 10 °C. The difference in these mesogenic properties is discussed by comparing their conformation difference at the molecular part of benzoate.
- 英文摘要: --
- 中文關鍵字: Chiral propanol; Chiral liquid crystal; Ferroelectricity; Conformation.
- 英文關鍵字: Chiral propanol; Chiral liquid crystal; Ferroelectricity; Conformation.