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

Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (18): 1822-1828. Previous Articles Next Articles

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

张其震¹, 刘建强^1,2, 唐新德¹, 张静智¹

1. 山东大学化学与化工学院, 济南, 250100;
2. 山东大学物理与微电子学院, 济南, 250100

投稿日期:2004-02-10 修回日期:2004-05-12 发布日期:2014-02-17
通讯作者: 张其震,E-mail:qzzhang@sdu.edu.cn E-mail:qzzhang@sdu.edu.cn
基金资助:
国家自然科学基金(Nos.29874020,59573029)和山东省自然科学基金资助项目.

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

ZHANG Qi-Zhen¹, LIU Jian-Qiang^1,2, TANG Xin-De¹, ZHANG Jing-Zhi¹

1. School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100;
2. School of Physics and Microelectronics, Shandong University, Jinan 250100

Received:2004-02-10 Revised:2004-05-12 Published:2014-02-17

Abstract

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 D0 is 10^-1s^-1, but that of photochromic LC polysiloxanes containing azobenzene moieties is 10^-8s^-1, thus the photoresponsive rate of LC dendrimer D0 is 10⁷ times larger than that of the latter.

Key words: photochromic liquid crystalline dendrimer, photoelectric information functional material, photochemical back-isomerization, thermal back isomerization, trans/cis isomer ratio, activation energy, quantum yield, intensity of light absorbed

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ZHANG Qi-Zhen, LIU Jian-Qiang, TANG Xin-De, ZHANG Jing-Zhi. Study on Photochemistry of Photochromic Liquid Crystalline Dendrimer Containing Four 4-Butoxyazobenzene Mesogenic Groups in Its Periphery[J]. Acta Chimica Sinica, 2004, 62(18): 1822-1828.

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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

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