作者:Takashi Karatsu、Tatsuro Hiresaki、Tatsuo Arai、Hirochika Sakuragi、Katsumi Tokumaru、Jakob Wirz
DOI:10.1246/bcsj.64.3355
日期:1991.11
unsaturated double bonds in their triplet sensitized isomerization was investigated for Ar–CH=CH–R, R=′Bu (BC) and Ph (SC) by means of stationary irradiations, laser flash photolyses, and MO calculations. Both olefins undergo mutual isomerization between their cis- and trans-isomers. However, BC has a unique triplet energy surface with two decay funnels at the planar trans (3t*) and twisted (3p*) conformations
通过固定照射研究了 3-chrysenyl 基团 (Ar) 在三线态敏化异构化中取代不饱和双键对 Ar-CH=CH-R、R='Bu (BC) 和 Ph (SC) 的影响,激光闪光光解和 MO 计算。两种烯烃在其顺式和反式异构体之间发生相互异构化。然而,BC 具有独特的三重态能量表面,在平面反式 (3t*) 和扭曲 (3p*) 构象处有两个衰变漏斗,它们彼此平衡;3t* 经历单分子衰变至基态反式异构体或三重态能量转移至顺式异构体(量子链过程),3p* 衰变至基态以产生顺式和反式异构体。BC 和 SC 观察到的 Tn←T1 吸收主要分别归因于 3t* 和 3p*,基于半经验 MO 计算。估计 3t* 和 3p* 处的种群。