通过使合适的二甲氧基咔唑与二苯基乙醛缩合,合成含有二苯基乙烯基部分的异构的3,6-二甲氧基-和2,7-二甲氧基咔唑。通过X射线晶体学证明了化合物的固态结构和分子顺序。发现这两种化合物都能在相当的玻璃转化温度(70-71°C)下形成玻璃。它们表现出高的热稳定性,5%的失重温度超过375°C。在C-3和C-6位具有二苯基乙烯基的异构体,在C-2和C-7位具有甲氧基的异构体(3a)表现出聚集诱导发射(AIE),而在C-2和C位具有二苯基乙烯基的异构体-7位和C-3和C-6位的甲氧基(3b)显示出相反的效果,即聚集引起的猝灭(ACQ)。衍生物3b显示出优异的电荷传输性质。在高电场下,其层中的飞行时间空穴漂移迁移率接近10 -3 cm 2 V -1 s -1。使用密度泛函理论(DFT)和随时间变化的DFT计算对化合物进行了比较理论分析。他们证明了在3,6-二甲氧基咔唑(3b)的衍生物中更有效的π共轭
通过使合适的二甲氧基咔唑与二苯基乙醛缩合,合成含有二苯基乙烯基部分的异构的3,6-二甲氧基-和2,7-二甲氧基咔唑。通过X射线晶体学证明了化合物的固态结构和分子顺序。发现这两种化合物都能在相当的玻璃转化温度(70-71°C)下形成玻璃。它们表现出高的热稳定性,5%的失重温度超过375°C。在C-3和C-6位具有二苯基乙烯基的异构体,在C-2和C-7位具有甲氧基的异构体(3a)表现出聚集诱导发射(AIE),而在C-2和C位具有二苯基乙烯基的异构体-7位和C-3和C-6位的甲氧基(3b)显示出相反的效果,即聚集引起的猝灭(ACQ)。衍生物3b显示出优异的电荷传输性质。在高电场下,其层中的飞行时间空穴漂移迁移率接近10 -3 cm 2 V -1 s -1。使用密度泛函理论(DFT)和随时间变化的DFT计算对化合物进行了比较理论分析。他们证明了在3,6-二甲氧基咔唑(3b)的衍生物中更有效的π共轭
In the present study, carbazole-based diaza[6]helicenes were synthesized utilizing versatile quinoline and 9-(2-ethylhexyl)-2,7-dimethoxycarbazole-3-carbaldehyde building blocks via the Wittig reactionphotocyclization strategy. The presence of bifunctional units comprising electrophilic chloroquinoline and electron-rich carbazole has opened up new opportunities. The chloro group was substituted with a chiral amine, allowing diastereomeric separation, and the chiral forms were monofunctionalized via electrophilic substitution on the carbazole unit. Postcyclization functionalization via substituting the carbazole unit provides a platform for the synthesis of chiral functionalized materials with potential application in fields such as asymmetric synthesis and organic electronics. The configuration of the diaza[6]helicene diastereomers was demonstrated by time-dependent density functional theory (TD-DFT) calculations. Furthermore, on the basis of the DFT calculations of the HOMO-LUMO energy levels of the chiral forms, these compounds can be potentially of interest as hole-transporting compounds