端基含4个丁氧基偶氮苯介晶基元光致变色液晶树状物的光化学研究  

Study on Photochemistry of Photochromic Liquid Crystalline Dendrimer Containing Four 4-Butoxyazobenzene Mesogenic Groups in Its Periphery

作　　者：张其震[1] 刘建强[1] 唐新德[1] 张静智[1] 

机构地区：[1]山东大学化学与化工学院,济南250100

出　　处：《化学学报》2004年第18期1822-1828,共7页Acta Chimica Sinica

基　　金：国家自然科学基金 (Nos.2 98740 2 0;595730 2 9);山东省自然科学基金资助项目

摘　　要：研究了新化合物含 4个丁氧基偶氮苯介晶基元的零代 (D0 )光致变色液晶树状物在氯仿和四氢呋喃中的吸收光强、最大吸收波长、摩尔消光系数、量子产率、活化能、异构转换率、反 -顺光异构化反应速率常数、热回复异构化反应速率常数、光回复异构化反应平衡常数及速率常数 .D0的光致变色反应速率常数为 10 -1s-1,而含偶氮基元液晶聚硅氧烷的光致变色反应速率常数为 10 -8s-1,因此液晶树状物D0的光响应速度比后者快 10 7倍 .The photochemical behavior of a new photochromic liquid crystalline (LC) carbosilane dendrimer of the zero generation (D0) in CHCl3 and THF was described. Four 4-butoxyazobenzene mesogenic fragments were attached in its periphery. The intensity of light absorbed, molar extinction coefficient, maximum absorption wave length, quantum yield and activation energy were determined. The reaction rate constants of trans/cis photochemical isomerization, photochemical back-isomerization and thermal back-isomerization and the equilibrium constant of photochemical back-isomerization reaction were discussed. Photochromic reaction rate constant of DO is 10(-1) s(-1), but that of photochromic LC polysiloxanes containing azobenzene moieties is 10(-8) s(-1), thus the photoresponsive rate of LC dendrimer D0 is 10(7) times larger than that of the latter.

关 键 词：光致变色液晶树状物 光电信息功能材料 光回复异构化 热回复异构化 丁氧基偶氮苯介晶基元 活化能 量子产率 吸收光强 

分 类 号：O644[理学—物理化学]