Two novel carbazole-based compounds 7a and 7b were synthesised as potential candidates for application in organic electronics. The materials were fully characterised by NMR spectroscopy, mass spectrometry, FTIR, thermogravimetric analysis, differential scanning calorimetry, cyclic voltammetry, and absorption and emission spectroscopy. Compounds 7a and 7b, both of which were amorphous solids, were stable up to 291 °C and 307 °C, respectively. Compounds 7a and 7b show three distinctive absorption bands: high and mid energy bands due to locally excited (LE) transitions and low energy bands due to intramolecular charge transfer (ICT) transitions. In dichloromethane solutions compounds 7a and 7b gave emission maxima at 561 nm and 482 nm with quantum efficiencies of 5.4% and 97.4% ± 10%, respectively. At positive potential, compounds 7a and 7b gave two different oxidation peaks, respectively: quasi-reversible at 0.55 V and 0.71 V, and reversible at 0.84 V and 0.99 V. At negative potentials, compounds 7a and 7b only exhibited an irreversible reduction peak at −1.86 V and −1.93 V, respectively.

中文翻译：

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新型多功能咔唑基分子的合成及其热，电化学和光学性质。

合成了两种新颖的咔唑基化合物7a和7b，作为可能用于有机电子领域的候选化合物。通过NMR光谱，质谱，FTIR，热重分析，差示扫描量热法，循环伏安法以及吸收和发射光谱对材料进行了全面表征。均为无定形固体的化合物7a和7b分别在高达291℃和307℃下稳定。化合物7a和7b显示三个独特的吸收带：由于局部激发（LE）跃迁而产生的高能带和中能带，以及由于分子内电荷转移（ICT）跃迁而引起的低能带。在二氯甲烷溶液中的化合物图7a和7b给出了在561nm和482nm处的最大发射，量子效率分别为5.4％和97.4％±10％。在正电势下，化合物7a和7b分别出现两个不同的氧化峰：在0.55 V和0.71 V时为准可逆，在0.84 V和0.99 V时为可逆。在负电势下，化合物7a和7b仅表现出不可逆的还原峰。分别为-1.86 V和-1.93V。