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化学学报
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化学学报 ›› 2003, Vol. 61 ›› Issue (3): 416-421. 上一篇    下一篇

研究论文

二代树状碳硅烷液晶研究I.端基含36个丁氧基偶氮苯介晶基元

张其震;刘建强;殷晓颖;张静智;季怡萍;赵晓光;李光   

  1. 山东大学化学化工学院;中国科学院长春应用化学研究所
  • 发布日期:2003-03-15

Study on a Carbosilane Liquid Crystalline Dendrimer of the Second Generation I. Containing Thirty-six 4-Butoxyazobenzene Groups in Its Periphery

Zhang Qizhen;Liu Jianqiang;Yin Xiaoying;Zhang Jingzhi;Ji Yiping;Zhao Xiaoguang;Li Guang   

  1. School of Chemistry and Chemical Engineering,Shandong University;Changchun Institute of Applied Chemistry,Chinese Academy of Sciences
  • Published:2003-03-15

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被引次数

12

用发散法合成周边含36个丁氧基偶氮苯介晶基元（M5）端基新的二代树状碳硅 烷液晶（D_2），并用元素分析，氢谱，激光质谱，红外，紫外，偏光显微镜，DSC和WAXD法表 征D2为向列相，与M5相同，二代树状物相态由介晶基定．D2液晶态相行为是 K85N107I103N69K，其熔点比M5降低27-41℃，清亮点比M5降低17-18宽10-23℃．二 代碳硅烷（D2）与一代碳硅烷（D1）相比熔点增加2-3℃，清亮点降低26-29℃，液 晶态温区减少℃．在二代树状物中观察到S＝＋3／2的高强向错．

关键词: 碳硅烷, 液晶, 苯偶氮化合物, 元素分析, 红外分光光度法, 紫外分光光度法

The divergent synthesis of a new carbosilane liquid crystalline (LC) dendrimer (D2) of the second generation is described. Thirty six 4- butoxyazobenzene groups (MS) are used as mesogenic fragments and attached in its periphery. Structure and properties of D2 were characterized by elemental analysis, 1~H NMR, MALDI-TOF-MS, IR, UV, polarizing optical micrograph, DSC and WAXD. Similar to MS, D2 is a nematic liquid crystal. The mesomorphic state of the dendrimer of second generation (D2) depends on that of mesogenic units. Phase behavior of D2 in LC state is K85N107I103N69K. The melting point of D2 is 27-41℃ less than that of MS, the clearing point of D2 is 17-18℃; less than that of MS and the mosophase region of D2 is 10 -23 ℃ greater than that of MS. The melting point of D2 is 2-3℃ greater than that of Dl, the clearing point of D2 is 26 -29℃ less than that of Dl and the mesophase region is 29-31℃ less than that of Dl. Six extinguished brushes emanating from a stationary point were observed, corresponding to the high-strength disclination of S = + 3/2 of dendrimer D2.

Key words: carbosilane, LIQUID CRYSTAL, BENZENE AZO COMPOUNDS, ELEMENTAL ANALYSIS, IR, UV

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