頁籤選單縮合
題名 | Synthesis and Mesomorphic Properties of Novel Liquid Crystal Series with Two Chiral Centres and Their Electro-Optic Characteristics= |
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作者 | Liao, Chien-tung; Jiang, Ming-hui; Wu, Nien-chieh; Wu, Zheng-long; Zou, Sing-fang; Lee, Jiunn-yih; |
期刊 | 中國工程學刊 |
出版日期 | 20100900 |
卷期 | 33:6 2010.09[民99.09] |
頁次 | 頁799-810 |
分類號 | 448.5 |
語文 | eng |
關鍵詞 | Two chiral centres; Chiral smetic A; Electroclinic effect; |
英文摘要 | Abstract Three series of novel chiral liquid crystals containing biphenyl moiety with two chiral centres (diastereomer) are synthesized and characterized. The structures and thermal phase behaviour of target compounds were characterized using 1H Nuclear Magnetic Resonance, mass spectroscopy, elemental analysis, differential scanning calorimetry, polarizing optical microscopy and X-ray diffraction measurements. All the compounds exhibit enantiotropic mesomorphic behavior. In this case, the chiral liquid crystalline molecules bearing the shorter length of chiral alkyl chain (m = 3 and 4) shows a mesomorphic dimorphism SmA*–N* and the analogous compounds bearing the longer length of chiral alkyl chain (m = 5 and 6) exhibits only one SmA* mesophase. Furthermore, the potential of SmA* mesophase for electro-optics applications exploiting the electroclinic effect was explored. The electro-optical properties of the SmA* phase, such as voltage-transmittance effect, electroclinic effect, and electro-optical response were also measured. As a consequence, the correlation between their electro-optical properties and chemical structures of these compounds were investigated. |
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