摘要
根据偶氮苯顺反异构定量公式ln[(A_0-A_(eq))/(A_t-A_(eq))]=k_tt和ln[(A_(eq)-A_0)/(A_(eq)-A_t)]=k_c(k_H)t,利用UVVis光谱研究系列D-π-A型偶氮苯衍生物在溶液中反-顺光异构反应速率常数、光回复异构反应速率常数、热回复异构反应速率常数和异构转化率。结果表明,系列偶氮苯衍生物光异构和热回复异构反应的速率常数数量级范围分别为10^(-3)~10^(-2)s^(-1)、10^(-5)~10^(-1)s^(-1),除化合物3',5'-二溴-3-甲基-4-羟基偶氮苯和3',5'-二溴-3,5-二甲氧基-4-羟基偶氮苯外,其他化合物的异构转化率很高,有作为光控开关材料的应用前景。
Based on the quantitative formulas ln[( A0-A(eq)) /( At-A(eq)) ]= ktt and ln[( A(eq)-A0) /( A(eq)-At) ]= kc( kH) t,the reaction rate constant of trans-cis photochemical isomerization,photochemical back-isomerization and thermal back-isomerization of series of azobenzenes in solvents were described via UV-Vis spectrum. The results reveal that the photoisomerization and thermal back-isomerization rate constant of azobenzenes in solvents range from 10^-3to 10^(-2)s^-1and 10^-5to 10^-1s^-1,respectively. The isomerization transformation ratio is excellent for most compounds except compounds 3',5'-dibromo-3-methyl-4-hydroxyazobenzene and 3',5'-dibromo-3,5-dimethoxy-4-hydroxyazobenzene. Thus it may be used as photoswitch material.
出处
《化学试剂》
CAS
北大核心
2016年第3期259-262,272,共5页
Chemical Reagents
基金
广东省自然科学基金资助项目(S2011010001544)
湛江市科技攻关项目(2014B01031)
国家级大学生创新创业训练计划项目(201310579001)
关键词
光异构反应
光回复异构
热回复异构
异构转换率
速率常数
定量
trans-cis photoisomerization
photo chemical back-isomerization
thermal back-isomerization
trans-cis isomer ratio
rate constant
quantification