作者:Joseph P. Dinnocenzo、Analuz Mark、Samir Farid
DOI:10.1021/acs.joc.9b00718
日期:2019.6.21
time-correlated single photon counting. The hydrophobicity of the donor moiety was found to enhance the formation of the folded conformer, which leads directly to exciplex formation. Electronic coupling matrix elements between ground, charge-transfer, and locally excited states were determined from correlations between radiative rate constants and average emission frequencies. The charge transfer (CT) character
不同于众多已知的激基复合物(电荷形成反应的产物)的例子,我们最近报道了可以用N形成阳离子激基复合物(电荷转移反应的产物)-甲基异喹啉鎓作为激发受体和烷基苯供体。现在,我们已经合成了五种分子内类似物(通过三亚甲基系链连接到烷基苯的异喹啉鎓)被证明非常适合证明发光的激基复合物可以在水中由纯有机成分形成。使用吸收光谱法,荧光法和与时间相关的单光子计数的组合,鉴定出导致电子转移的三个构象异构体(anti,gauche和folded)。发现供体部分的疏水性增强了折叠的构象异构体的形成,这直接导致了激基复合物的形成。根据辐射速率常数与平均发射频率之间的相关性,可以确定基态,电荷转移和局部激发态之间的电子耦合矩阵元素。激基复合物的电荷转移(CT)特性(88–97%)由电子耦合计算得出。尽管在高极性溶剂中具有如此高的CT特性,但激基复合物荧光量子产率仍高达0.03,寿命高达17 ns。