化学学报 ›› 2006, Vol. 64 ›› Issue (15): 1593-1600. 上一篇    下一篇

研究论文

含硝基二代光致变色液晶树枝状大分子的光化学研究

王艳1,张其震*,2   

  1. (1中国海洋大学环境科学与工程学院 青岛 266003)
    (2山东大学化学化工学院 济南 250100)
  • 收稿日期:2005-08-06 修回日期:2006-04-28 出版日期:2006-08-14 发布日期:2006-08-14
  • 通讯作者: 张其震

Photochemical Study of Photochromic Liquid Crystalline Dendrimer of the Second Generation Containing Nitro Groups

WANG Yana, ZHANG Qi-Zhen*,b   

  1. (a School of Environmental Science and Engineering, Ocean University of China, Qingdao 266003)
    (b School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100)
  • Received:2005-08-06 Revised:2006-04-28 Online:2006-08-14 Published:2006-08-14
  • Contact: ZHANG Qi-Zhen

研究了树外围含36个硝基偶氮苯端基新型二代碳硅烷光致变色液晶树枝状大分子(G2)在溶液中的最大吸收波长, 摩尔消光系数, 反-顺光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. G2的光致变色反应速率常数的数量级为10-1 s-1, 而含偶氮端基侧链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. G2的光化学回复异构化反应平衡常数kt/kc为1.77~1.97, 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 (G2) of the second generation containing nitroazophenyl groups on its periphery in solution were described. Photochromic reaction rate constant of G2 in CHCl3 and THF was 10-1 s-1, but that of photochromic side-chain polysiloxanes containing azophenyl moieties was 10-8 s-1, thus the photoresponsitive rate of the liquid crystalline dendrimer G2 is 107 times larger than that of the latter. The equilibrium constant kt/kc of photochemical back-isomerization reaction of G2 are 1.77~1.97 approaching to 1, and thus it is applicable to photoswitch materials.

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