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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (2): 138-142. 上一篇    下一篇

研究论文

基于季戊四醇的三代硅碳烷液晶树状物研究

唐新德1,2，张其震*,1，李爱香1，范星河3，陈小芳3，周其凤3   

  1. (1山东大学化学与化工学院 济南 250100)
    (2济南大学化学化工学院 济南 250022)
    (3北京大学化学与分子工程学院 北京 100871)
  • 投稿日期:2004-06-14 修回日期:2004-09-21 发布日期:2010-12-10
  • 通讯作者: 张其震

Study on a Novel Pentaerythritol-based Carbosilane Liquid Crystalline Dendrimer of the Third Generation

TANG Xin-De1,2,ZHANG Qi-Zhen*,1,LI Ai-Xiang1
FAN Xing-He3,CHEN Xiao-Fang3,ZHOU Qi-Feng3   

  1. (1 School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100)
    (2 School of Chemistry and Chemical Engineering, Jinan University, Jinan 250022)
    (3 College of Chemistry and Molecular Engineering, Peking University, Beijing 100871)
  • Received:2004-06-14 Revised:2004-09-21 Published:2010-12-10
  • Contact: ZHANG Qi-Zhen

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1145

被引次数

11 | 2

用发散法合成了季戊四醇-四烯丙基醚为核、周边含硝基偶氮苯介晶基元(M-NO2)端基的新型三代硅碳烷液晶树状物PCSi-3G-NO2, 并利用元素分析、红外光谱(IR)、核磁共振(NMR)、偏光显微镜(POM)、差示扫描量热法(DSC)和X射线衍射(XRD)进行表征. PCSi-3G-NO2显示胆甾相和近晶SE相, 其液晶相行为是K57SE115I100Ch80SE53K. 而对应的介晶基元M-NO2显示向列相, 二者在熔点、清亮点和液晶态温区等方面差别较大.

关键词: 硅碳烷液晶树状物, 季戊四醇, 4-硝基偶氮苯, 三代树状物, 介晶基元

The divergent synthesis of a novel pentaerythritol-based carbosilane liquid crystalline dendrimer PCSi-3G-NO2 was described. A terminal Si—Cl functional carbosilane dendrimer of the third generation based on pentaerythritol was used as dendritic scaffold and subsequently functionalized with 4-nitroazobenzene (M-NO2). Structure and properties of PCSi-3G-NO2 were characterized by elemental analysis, 1H NMR, IR, polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). PCSi-3G-NO2 is cholesteryl and smectic E liquid crystal, different from the mesogenic unit M-NO2 that shows nematic phase. They are different in terms of the melting point, the clearing point and the temperature region of mesogenic phase.

Key words: carbosilane liquid crystalline dendrimer, pentaerythritol, 4-nitroazobenzene, dendrimer of the third generation, mesogenic group