A series of carbazole-thiophene dimers,P1–P9, were synthesized using Suzuki-Miyaura and Ullmann coupling reactions. InP1–P9, carbazole-thiophenes were linked at the N-9 position for different core groups via biphenyl, dimethylbiphenyl, and phenyl. Electronic properties were evaluated by UV-Vis, cyclic voltammogram, and theoretical calculations. Particularly, the effects of conjugation connectivity on photophysical and electrochemical properties, as well as the correlation between carbazole-thiophene and the core, were studied. Carbazole connecting with thiophenes at the 3,6-positions and the phenyl group as a core group leads to increased stabilization of HOMO and LUMO energy levels where the bandgap (ΔE) is significantly reduced.
一系列的咔唑-噻吩二聚体,P1-P9,是通过Suzuki-Miyaura和Ullmann偶联反应合成的。在P1-P9中,咔唑-噻吩通过联苯、二甲基联苯和苯在N-9位置连接不同的核心基团。通过紫外-可见光谱、循环伏安法和理论计算评估了电子性质。特别地,研究了共轭连接对光物理和电化学性质的影响,以及咔唑-噻吩与核心之间的相关性。咔唑连接在3,6-位置的噻吩和苯基团作为核心基团导致HOMO和LUMO能级的稳定增加,带隙(ΔE)显著降低。