Photoinduced electron transfer reaction tuned by donor–acceptor pairs via the rigid, linear spacer heptacyclo[6.6.0.02,6.03,13.04,11.05,9.010,14]tetradecane
作者:Tahsin J. Chow、Nan-Rong Chiu、Hong-Chuan Chen、Chong-Yow Chen、Wei-Shan Yu、Yi-Ming Cheng、Chung-Chih Cheng、Chen-Pin Chang、Pi-Tai Chou
DOI:10.1016/s0040-4020(03)00881-0
日期:2003.7
A new class of donor-saturated hydrocarbon bridge}-acceptor (D–B–A) dyads were synthesized and utilized on a systematic approach to evaluate the corresponding photoinduced electron transfer (ET) process. Among these dyads heptacyclo[6.6.0.02,6.03,13.04,11. 05,9.010,14]tetradecane (HCTD) was used as a unique spacer, which possesses a geometry of high symmetry (D2d), rigidity and linearity. The spectroscopy
合成了一类新的供体-饱和烃桥}-受体(D–B–A)二元组,并将其用于系统方法来评估相应的光致电子转移(ET)过程。在这些二元组中,七环[6.6.0.0 2,6 .0 3,13 .0 4,11。0 5,9 .0 10,14 ]十四烷(HCTD)被用作独特的间隔基,它具有高对称性(D 2 d),刚性和线性的几何形状。借助理论计算分析了激发态ET的光谱和动力学,作为供体/受体电子态,取向以及溶剂性质的函数。观察到供体荧光(F1波段)与宽电荷转移(CT)发射的出现相关。CT谱带的波长和强度都随溶剂极性而变化,而其上升动态与F 1谱带的衰减非常吻合。在乙腈中,CT态的衰减快于ET的速率(〜63 ps -1),因此无法解析相应的稳态发射。在苯和1,2-二硫代缩酮(3a和3b)的情况下,D和Aπ发色团以不同的方向排列,观察到了令人着迷的效果。估计的ET速率3a(3.9×10 10 s -1)明显快于3b(7×10