Impact of the Electronic Environment in Carbazole-Appended <i>o</i>-Carboranyl Compounds on the Intramolecular-Charge-Transfer-Based Radiative Decay Efficiency
作者:Seok Ho Lee、Min Sik Mun、Ji Hye Lee、Sehee Im、Wonchul Lee、Hyonseok Hwang、Kang Mun Lee
DOI:10.1021/acs.organomet.1c00060
日期:2021.4.12
experiments of the compounds in THF–water mixtures also confirmed the aggregation induced emission phenomenon. Interestingly, C1 and C3 exhibited significantly higher quantum yields (Φem) and radiative decay constants (kr) in the film state than C2 and C4, indicating more efficient ICT-based radiative decay for C1 and C3, where the o-carborane cage is appended to ortho- and para-positions (C1- and C3-positions)
的咔唑基的基于分子内电荷转移(ICT)过渡的辐射衰变过程中的电子效应的影响闭合碳- ö -carborane被本文检查。四闭合碳- Ö -carboranyl化合物(C1 - C4)附加到9的C1-C4的位置ħ咔合成和通过多核NMR光谱和元素分析完全表征。C1和C4的分子结构通过X射线衍射晶体学确定。所有化合物在λabs区域均表现出最低的吸收带= 330–345 nm,这归因于咔唑基团上自旋允许的π–π *跃迁,以及邻咔啉和咔唑基团之间的较弱的分子内电荷转移跃迁。尽管在298 K的THF中没有观察到这些化合物,但这些化合物在刚性状态下(在77 K的THF中和以薄膜形式)显示出很强的黄色发射(λem = 550–600 nm)。对于化合物的最佳第一激发态(S 1)结构的结果,可以将发射带分配给对应于o-碳硼烷单元的ICT跃迁。THF-水混合物中化合物的光致发光实验也证实了聚集诱导的发射现象。