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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (14): 1335-1342. 上一篇    下一篇

研究论文

含硝基一代光致变色液晶树枝状大分子的光化学研究

张其震*1，盛昕1，李爱香1，王艳2   

  1. (1山东大学化学化工学院 2环境与工程学院 济南 250100)
  • 投稿日期:2004-12-31 修回日期:2005-03-10 发布日期:2010-12-10
  • 通讯作者: 张其震

Study on Photochemistry of Photochromic Liquid Crystalline Dendrimer of the First Generation Containing Nitro Groups

ZHANG Qi-Zhen*1, SHENG Xin1, LI Ai-Xiang1, WANG Yan2   

  1. (1 School of Chemistry and Chemical Engineering, 2 School of Environmental Science and Engineering, Shandong University, Jinan 250100)
  • Received:2004-12-31 Revised:2005-03-10 Published:2010-12-10
  • Contact: ZHANG Qi-Zhen

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被引次数

36 | 1

研究了树外围含12个硝基偶氮苯基元新型一代碳硅烷光致变色液晶树枝状大分子G1和基元小分子M1在溶液中的最大吸收波长、摩尔消光系数、反-顺光化学异构化反应速率常数、热回复异构化反应速率常数、光化学回复异构化反应平衡常数及速率常数. G1的光致变色反应速率常数的数量级为10－1 s－1, 而含偶氮基元液晶聚硅氧烷的光致变色反应速率常数的数量级为10－8 s－1, 因此液晶树枝状大分子的光响应速率比后者快107倍. G1的光回复异构化反应平衡常数kt /kc为1.76～1.77, 有作为光控开关材料的应用前景.

关键词: 光致变色液晶树枝状大分子, 光异构化, 光回复异构化, 热回复异构化, 光控开关材料, 光电信息存贮材料

The molar extinction coefficient, maximum absorption wavelength, reaction rate constants of trans-cis photochemical isomerization, thermal back-isomerization and photochemical back-isomerization and equilibrium constant of photochemical back-isomerization reaction of a novel photochromic liquid crystalline dendrimer G1 of the first generation containing nitroazophenyl groups on its periphery and small molecular azophenyl moiety M1 in solution were described. Photochromic rate constant of G1 in CHCl3 and THF was 10－1 s－1, but that of photochromic liquid crystalline polysiloxanes containing azophenyl moieties was 10－8 s－1, thus the photoresponsitive rate of liquid crystalline dedrimer G1 is 107 times larger than that of the latter. The equilibrium constants kt/kc of photochemical back-isomerization reaction of G1 are 1.76～1.77 approaching to 1, and thus it is appliable to photoswitch material.

Key words: photochromic liquid crystalline dendrimer, photoisomerization, photo back-isomerization, thermal back-isomerization, photoswitch material, photoelectrical informational storage material