Synthesis of B←N embedded indacenodithiophene chromophores and effects of bromine atoms on photophysical properties and energy levels
作者:Yongchun Li、Huifeng Meng、Dong Yan、Yuqing Li、Bo Pang、Kai Zhang、Genggeng Luo、Jianhua Huang、Chuanlang Zhan
DOI:10.1016/j.tet.2018.06.035
日期:2018.8
Developing novel fused π-conjugated chromophores has been an energetic research realm and knowing how to adjust their photophysical properties and energy levels through structure tailoring is of pivotal importance. Herein, based on the ladder-type π-conjugated indacenodithiophene (IDT) moiety, four B←N embedded IDT structures, namely, BNIDT, BNIDT-2Br, BNIDT-4Br, and BNIDT-6Br are synthesized and fully
开发新型的融合π共轭生色团一直是一个充满活力的研究领域,并且知道如何通过结构调整来调节其光物理性质和能级是至关重要的。在此,基于梯型π共轭茚并二噻吩(IDT)部分,合成并充分表征了四个B←N嵌入的IDT结构,即BNIDT,BNIDT-2Br,BNIDT- 4Br和BNIDT-6Br。系统地讨论了嵌入IDT主干的B←N单元和周围锚定的Br原子对光物理性质和能级的影响。从IDT到BNIDT,一个新的分子内电荷转移(ICT)跃迁带出现在吸收光谱中的较低能量(400–600 nm)处,光带隙(E g)从3.25 eV减小到2.11 eV,并且荧光发射峰从由于将缺电子的B←N引入主链,因此390 nm至565 nm以及显着延长的荧光寿命从1.2 ns延长至12.4 ns。进一步将Br原子锚定在主链的外围会导致降低的光学带隙,降低的荧光量子产率(Φ)和BNIDT的缩短的荧光寿命(τ)(E g = 2