The energy level of a hole-transporting material (HTM) in organic electronics, such as organic light-emitting diodes (OLEDs) and perovskite solar cells (PSCs), is important for device efficiency. In this regard, we prepared 4,4′-(cyclohexane-1,1-diyl)bis[N,N-bis(4-methoxyphenyl)aniline] (TAPC-OMe), C46H46N2O4, to tune the energy level of 4,4′-(cyclohexane-1,1-diyl)bis[N,N-bis(4-methylphenyl)aniline] (TAPC), which is a well-known HTM commonly used in OLED applications. A systematic characterization of TAPC-OMe, including 1H and 13C NMR, elemental analysis, UV–Vis absorption, fluorescence emission, density functional theory (DFT) calculations and single-crystal X-ray diffraction, was performed. TAPC-OMe crystallized in the triclinic space group P\overline1}, with two molecules in the asymmetric unit. The dihedral angles between the central amine triangular planes and those of the phenyl groups varied from 26.56 (9) to 60.34 (8)° due to the steric hindrance of the central cyclohexyl ring. This arrangement might be induced by weak hydrogen bonds and C—H...π(Ph) interactions in the extended structure. The emission maxima of TAPC-OMe showed a significant bathochomic shift compared to that of TAPC. A strong dependency of the oxidation potentials on the nature of the electron-donating ability of substituents was confirmed by comparing oxidation potentials with known Hammett parameters (σ).
在有机发光二极管(OLED)和过氧化物太阳能电池(PSC)等有机电子器件中,空穴传输材料(HTM)的能级对器件效率非常重要。在这方面,我们制备了 4,4′-(环己烷-1,1-二基)双[N,N-双(4-甲氧基苯基)苯胺] (TAPC-OMe),C46H46N2O4,以调节 4,4′-(环己烷-1,1-二基)苯胺的能级、4′-(环己烷-1,1-二基)双[N,N-双(4-甲基苯基)苯胺](TAPC)的能级。研究人员对 TAPC-OMe 进行了系统表征,包括 1H 和 13C NMR、元素分析、紫外-可见吸收、荧光发射、密度泛函理论(DFT)计算和单晶 X 射线衍射。TAPC-OMe 在三菱空间群 P\overline1} 中结晶,不对称单元中有两个分子。由于中央环己基环的立体阻碍,中央胺三角形平面与苯基平面之间的二面角从 26.56 (9) ° 到 60.34 (8) ° 不等。这种排列可能是由扩展结构中的弱氢键和 C-H...π(Ph)相互作用引起的。与 TAPC 相比,TAPC-OMe 的发射最大值出现了明显的浴原子偏移。通过将氧化电位与已知的哈米特参数(σ)进行比较,证实了氧化电位与取代基电子供能性质的密切关系。