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

作　　者：张其震[1] 殷晓颖[1] 王艳[2] 

机构地区：[1]山东大学化学化工学院,济南250100 [2]山东大学化学环境科学与工程学院,济南250100

出　　处：《化学学报》2005年第10期941-946,i004,共7页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.29874020;59573029);山东省自然科学基金资助项目.

摘　　要：报道了新化合物含108个丁氧基偶氮基元端基的三代(D3)碳硅烷光致变色液晶树状物在各溶液中的反-顺光异构化(光致变色)反应速率常数kp,光化学回复异构化正/逆反应速率常数kt和kc,热回复异构化反应速率常数kH,光化学回复异构化反应平衡常数kt/kc,活化能E,异构化转换率及热回复异构化反应中的反-顺异构体组分比.D3的光致变色反应速率常数为10-1s-1,而含偶氮基元的光致变色液晶聚硅氧烷的光致变色反应速率常数为10-8s-1,因此,D3的光响应速度比后者快107倍.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 kp, thermal back-isomerization kH and photochemical back-isomerization kt and kc 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 kt/kc 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.

关 键 词：光致变色液晶树状物 丁氧基偶氮苯介晶基元 碳硅烷 化学研究 端基 三代 反应速率常数 反应平衡常数 液晶聚硅氧烷 异构化反应 光异构化 新化合物 光化学 回复 活化能 异构体 转换率 速度比 光响应 溶液 

分 类 号：O627.41[理学—有机化学]