摘要
研究了端基含己氧基偶氮苯基元新的一代碳硅烷光致变色液晶树状物 G1及其偶氮基元化合物 M3在各种溶液中的反顺光异构化反应速率常数、光回复异构化反应速率常数、热回复异构化反应速率常数、量子产率、活化能和异构转换率 .G1和 M3的光致变色速率常数为 0 .1 s- 1 ,比对应的光致变色液晶聚硅氧烷的光响应速度快 1 0
Studies were made of on the absorbance at 360 nm A 360, difference of absorbance at 360 nm ΔA 360, intensity of light I 0, absorption intensity of light I a, molar extinction coefficient at 360 nm ε 360, maximum absorption wavelength λ max, quantum yield Φ, activation energy E, trans/cis isomer absorbance ratio A/A 0, trans/cis photo-isomerization reaction rate constant k p, photo back-isomerization positive/counter reaction rate constants k t and k c, thermal back-isomerization reaction rate constant k H at different temperatures and photo back-isomerization reaction equilibrium value k t/k c of a new carbosilane photochromic liquid crystalline(LC) dendrimer of the first generation(G1) containing twelve 4-hexyloxyazobenzene moieties in its periphery and azobenzene unit M3 in solvents such as chloroform, tetrahydrofuran and so on. solvent were described. The photochromic rate constant of G1 and M3 are 10 -1 s -1, their photoresponsive rate are 10 7 times larger than that of photochromic liquid crystalline polysiloxane.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第7期1368-1372,MJ06,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金 (批准号 :2 98740 2 0
5 95 73 0 2 9)
山东省自然科学基金 (批准号 :Y95 B0 72 0 )
中国科学院长春应用化学研究所高分子物理重点实验室基金资助
关键词
己氧基偶氮苯基
碳硅烷
光致变色液晶树状物
光响应行为
Photochromic liquid crystalline dendrimer
Photoelectric informational functional material
Photoisomerization
Photo back-isomerization
Thermal back-isomerization
Activation energy