Studies on a Carbosilane Liquid Crystalline Dendrimer of the Third Generation Containing 108 4-Hexyloxyazobenzene Mesogenic Groups in Periphery

Abstract

Abstract: The divergent synthesis of a new carbosilane liquid crystalline(LC) dendrimer of the third generation(D3) was discribed. One hundred and eight 4-hexyloxyazobenzene groups were used as mesogenic fragments and attached in periphery and four carbosilane as the core. The structure and properties of D3 were characterized by elemental analysis, ¹H NMR, MALDI-TOF-MS, IR, UV-Vis, polarizing optical micrograph, DSC and WAXD. D3 is a nematic liquid crystal, which is the same as M3.The mesomorphic behaviour of the dendrimer depends on that of the mesogenic units. The phase behavior of D3 is K79N136I132N. The melting point of D3 is 19 ℃ lower than that of M3, and the clearing point of D3 is 16 ℃ higher than that of M3 and the mesophase region of D3 is 35 ℃ wider than that of M3.

Key words: Dendrimer, Nematic, Liquid crystal, Carbosilane, 4-Hexyloxyazobenzene

CLC Number:

O631

TrendMD:

ZHANG Qi-Zhen, YIN Xiao-Ying, WANG Da-Qing, LI Guang, JI Yi-Ping, ZHAO Xiao-Guang . Studies on a Carbosilane Liquid Crystalline Dendrimer of the Third Generation Containing 108 4-Hexyloxyazobenzene Mesogenic Groups in Periphery[J]. Chem. J. Chinese Universities, 2004, 25(1): 170.

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Studies on a Carbosilane Liquid Crystalline Dendrimer of the Third Generation Containing 108 4-Hexyloxyazobenzene Mesogenic Groups in Periphery

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