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

Acta Chimica Sinica ›› 2005, Vol. 63 ›› Issue (10): 941-946. Previous Articles Next Articles

Original Articles

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

(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

(¹School of Chemistry and Chemical Engineering, ²School 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

Abstract

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 k_p, thermal back-isomerization k_H and photochemical back-isomerization k_t and k_c 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 k_t/k_c 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

Cite this article

ZHANG Qi-Zhen*, YIN Xiao-Ying, WANG Yan². Study on Photochemistry of Carbosilane Photochromic Liquid Crystalline Dendrimer of the Third Generation Containing 108 4-Butoxyazobenzene Mesogenic Groups on Periphery[J]. Acta Chimica Sinica, 2005, 63(10): 941-946.

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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

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

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