Twofold adiabatic cis—trans isomerization of Z,Z-1,6-bisstyrylcycloheptatriene in the triplet state
作者:Ingjald Anger、Mikael Sundahl、Olof Wennerström
DOI:10.1016/0009-2614(95)00359-2
日期:1995.5
The three E/Z isomers of 1,6-bisstyrylcycloheptatriene, ZZ, EZ and EE, have been prepared and studied in the triplet state. The triplet species produced on sensitization of each of the three isomers have identical lifetimes (τT = 1.0 μs) and T1−Tn absorption spectra. Furthermore, EZ and ZZ undergo efficient one- and two-fold adiabatic isomerizations (φEZ → EE = 0.82, φZZ → EZ + EE = 0.83) respectively
1,6-双苯乙烯基环庚三烯的三种E / Z异构体ZZ,EZ和EE已在三重态下制备和研究。在每个三种异构体的致敏所产生的三线态物种具有相同的寿命(τ Ť = 1.0微秒)和T 1 -T Ñ吸收光谱。此外,EZ和ZZ分别进行有效的一倍和两倍绝热异构化(φEZ→EE = 0.82,φZZ→EZ + EE = 0.83),主要产生光固定态混合物中的主要异构体EE(97% EE,3%EZ)。因此,任何异构体的敏化激发都产生了平衡的三重态,该三态以具有与EE相似的几何形状的物质为主。从三重态的衰变主要产生EE。