Studies on Carbosilane Liquid Crystalline Dendrimer of the Second Generation--Containing 36 4-Hexyloxyazobenzene Groups in Its Periphery

Abstract

Abstract: The divergent synthesis of a new carbosilane liquid crystalline(LC) dendrimer of the second generation(D2) was described. Thirty-six 4-hexyloxyazobenzene groups (M3) were used as mesogenic fragments and attached to its periphery. The structure and properties of D2 were characterized by elementary analysis, ¹HNMR, MALDI-TOF-MS, IR, UV, polarizing optical micrograph, DSC and WAXD. It is argued that mesophase of nematic type is realized. It is shown that the mesophase type of the dendrimer D2 and D1 essentially depends on the chemical nature of the mesogenic groups and is the same as that of mesogenic unites. The phase behavior of D2 in LC state is K90N105H113N75K. The melting point of D2 decreases 26-33℃ than that of M3, the temperature at its clear point decreases 3-15℃ than that of M3 and its mesophase region is enlarged 11-30 ℃ than that of M3. The melting point of D2 decreases 2-3℃ than that of D1, the temperature at its clear point decreases 11-21℃ than that of D1 and its mesophase region decreases 8-19℃ than that of D1.

Key words: Dendrimer, Liquid crystal, Nematic phase, Carbosilane

CLC Number:

O631

TrendMD:

ZHANG Qi-Zhen, LIU Jian-Qiang, YIN Xiao-Ying, ZHANG Jing-Zhi, ZHAO Xiao-Guang, LI Guang, JI Yi-Ping. Studies on Carbosilane Liquid Crystalline Dendrimer of the Second Generation--Containing 36 4-Hexyloxyazobenzene Groups in Its Periphery[J]. Chem. J. Chinese Universities, 2003, 24(9): 1704.

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Studies on Carbosilane Liquid Crystalline Dendrimer of the Second Generation--Containing 36 4-Hexyloxyazobenzene Groups in Its Periphery

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