基于季戊四醇的三代硅碳烷液晶树状物研究  

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

作　　者：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] 

机构地区：[1]山东大学化学与化工学院 [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

出　　处：《化学学报》2005年第2期138-142,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos. 29874020; 59573029)资助项目.

摘　　要：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.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, H-1 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.

关 键 词：介晶基元 液晶 偶氮苯 胆甾相 发散法 向列相 相行为 季戊四醇 烯丙基醚 硝基 

分 类 号：O627.4[理学—有机化学]