標題: | Synthesis and liquid crystalline studies of disc-shaped molecule on azo-bridged benzothiazole-phenyl ethers |
作者: | Yeap, Guan-Yeow Rahim, Mursyida Abdul Lin, Chien-Min Lin, Hong-Cheu Maeta, Nobuyuki Ito, Masato M. 材料科學與工程學系 Department of Materials Science and Engineering |
關鍵字: | Triphenylene;Discotic liquid crystal;Nematic phase;Smectic C phase;Phase transition |
公開日期: | 十一月-2016 |
摘要: | A new series of triphenylene core attached by six peripheral arms containing benzothiazole-azo with terminal ethoxy unit have successfully been synthesized and their liquid crystalline properties were characterized. The members in this series differ by the length of the methylene unit of-(CH2)(n)-, where n, varied following ascending order from 5 to 10. The molecular structure was characterized by elemental (C, H and N) analysis and spectroscopic methods including Fourier Transform Infrared (FT-IR) and Proton Nuclear Magnetic Resonance (H-1 NMR). The texture and the phase transition temperatures were investigated by using polarizing optical microscopy (POM) and differential scanning calorimetry (DSC). The disc-shape molecule with shorter spacer (n = 5) showed monotropic nematic phase. The higher homologues with n = 8-10 exhibited enantiotropic nematic phase and monotropic smectic C phase. The XRD diffraction studies further confirm the presence of smectic C without any discotic columnar phase. (C) 2016 Published by Elsevier B.V. |
URI: | http://dx.doi.org/10.1016/j.molliq.2016.08.110 http://hdl.handle.net/11536/132610 |
ISSN: | 0167-7322 |
DOI: | 10.1016/j.molliq.2016.08.110 |
期刊: | JOURNAL OF MOLECULAR LIQUIDS |
Volume: | 223 |
起始頁: | 734 |
結束頁: | 740 |
顯示於類別: | 期刊論文 |