(low-energy region) and the TPA-centered π–π* transition (high-energy region). In particular, the emission spectra of the dyads displayed interesting dual-emissive patterns via a significant intramolecular energy transfer (IET) process between the salen–Al moiety and TPA group. Notably, this IET process was systematically tuned by varying the substituents and dominantly observed in the rigid state. More
一系列含
三苯胺(
TPA)的Salen-Al组装二元组,[salen(3- t Bu-5-R)2 Al(OC 6 H 4 - p -N(C 6 H 5)2)]] [salen = N,N′-双(
水杨基)
乙二胺;R = H(D1),t Bu(D2),Ph(D3),OMe(
D4)和NMe 2(D5)],制备得率较高(50–80%),并通过NMR光谱和元素分析已充分表征分析。D1的紫外/可见吸收和光致发光(PL)光谱–
D4除D5外,在
四氢呋喃溶液中表现出双重模式,可分配给以Salen-Al为中心的π-π*跃迁(低能区)和以
TPA为中心的π-π*跃迁(高能)。地区)。特别是,二联体的发射光谱通过Salen–Al部分与
TPA基团之间的显着分子内能量转移(IET)过程显示出有趣的双发射模式。值得注意的是,该IET过程是通过改变取代基进行系统调节的,并且主要在刚性状态下观察到。更有趣的是,与没有
TPA组的Salen-Al配合物(A1