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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (10): 941-946. 上一篇    下一篇

研究论文

三代碳硅烷光致变色液晶树状物的光化学研究——端基含108个4-丁氧基偶氮苯介晶基元

张其震*1，殷晓颖1，王艳2   

  1. (山东大学　1化学化工学院　2环境科学与工程学院　济南 250100)
  • 投稿日期:2004-10-10 修回日期:2005-01-24 发布日期:2010-12-10
  • 通讯作者: 张其震

Study on Photochemistry of Carbosilane Photochromic Liquid Crystalline Dendrimer of the Third Generation Containing 108 4-Butoxyazobenzene Mesogenic Groups on Periphery

ZHANG Qi-Zhen*1, YIN Xiao-Ying1, WANG Yan2   

  1. (1 School of Chemistry and Chemical Engineering, 2 School of Environmental Science and Engineering, Shandong University, Jinan 250100)
  • Received:2004-10-10 Revised:2005-01-24 Published:2010-12-10
  • Contact: ZHANG Qi-Zhen

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913

被引次数

18

报道了新化合物含108个丁氧基偶氮基元端基的三代(D3)碳硅烷光致变色液晶树状物在各溶液中的反-顺光异构化(光致变色)反应速率常数kp, 光化学回复异构化正/逆反应速率常数kt和kc, 热回复异构化反应速率常数kH, 光化学回复异构化反应平衡常数kt/kc, 活化能E, 异构化转换率及热回复异构化反应中的反-顺异构体组分比. D3的光致变色反应速率常数为10－1 s－1, 而含偶氮基元的光致变色液晶聚硅氧烷的光致变色反应速率常数为10－8 s－1, 因此, D3的光响应速度比后者快107倍.

关键词: 光致变色液晶树状物, 光电信息存储材料, 反-顺光异构化, 光回复异构, 热回复异构, 活化能, 异构转换率

The photochemical behavior of a new photochromic liquid crystalline (LC) carbosilane dendrimer of the third generation (D3) was described. 108 4-butoxyazobenzene mesogenic fragments were attached to its periphery. The reaction rate constant of trans/cis photochemical isomerization kp, thermal back-isomerization kH and photochemical back-isomerization kt and kc of D3 were described. The transition percent of isomer A/A0, activation energy E, trans/cis ratio in thermal back-isomerization A′/A0 and equilibrium constant of photochemical back-isomerization reaction kt/kc of D3 were discussed. Photochromic rate constant of D3 is 10－1 s－1, but that of photochromic LC polysiloxanes containing azobenzene moieties in side chain is 10－8 s－1, thus the photoresponsive rate of LC dendrimer D3 is 107 times larger than that of the latter.

Key words: photochromic liquid crystalline dendrimer, photo-electro informational storage material, trans/cis photo-isomerization, photochemical back-isomerization, thermal back-isomerization, activation energy, transition percent of isomer