temperature. Theoretical calculations on the first excited singlet state of each compound suggested that emission in the low-energy region distinctly involved intramolecular charge transfer (ICT) between carborane and terphenylene rings of both compounds; however, the high-energy emission of 1 was correlated with ICT between carborane and terminal phenyl rings, while that of 2 involved ICT between carborane
在此,p -三
联苯基ø -carboranyl化合物,4,4“ -双[2-(p - ñ丁基苯基)-1- Ô -carboran -1-基] - p -三
联苯(1)和4,4-制备了“-双(2-正丁基-1-邻-碳
硼烷-1-基)-对-三
联苯(2),并通过多核NMR光谱和元素分析对其进行了全面表征。还通过单晶X射线衍射法分析了1的分子结构。这两种化合物显示出双发射频带(λ
EM 约350和450 nm)在刚性状态(例如,在77 K时的溶液),而在ca处只有一个发射峰。在环境温度下在溶液中观察到350 nm。对每种化合物的第一个激发单线态的理论计算表明,低能区的发射明显涉及两种化合物的碳
硼烷和三亚苯基环之间的分子内电荷转移(ICT)。然而,高能量发射1用碳
硼烷和终端苯环之间ICT相关,而的2碳
硼烷和亚三联之间介入ICT以及一个π→π *的亚三
联苯基部分的过渡。因此,可以得出结论,o中不存在末端苯环-碳
硼烷基化合物会导致π→π