COA of Formula: C9H7NOIn 2019 ,《Highly efficient thermally activated delayed fluorescence emitter developed by replacing carbazole with 1,3,6,8-tetramethyl-carbazole》 was published in Frontiers in Chemistry (Lausanne, Switzerland). The article was written by Cai, Jia-Lin; Liu, Wei; Wang, Kai; Chen, Jia-Xiong; Shi, Yi-Zhong; Zhang, Ming; Zheng, Cai-Jun; Tao, Si-Lu; Zhang, Xiao-Hong. The article contains the following contents:
Carbazole (Cz) is the one of the most popular electron donors to develop thermally activated delayed fluorescence (TADF) emitters, but addnl. groups are generally required in the mols. to enhance the steric hindrance between Cz and electron acceptor segments. To address this issue, we replaced Cz with its derivative 1,3,6,8-tetramethyl-carbazole (tMCz) to develop TADF emitters. Two novel compounds, 6-(4-(carbazol-9-yl)phenyl)-2,4-diphenylnicotinonitrile (CzPN) and 2,4-diphenyl-6-(4-(1,3,6,8-tetramethyl-carbazol-9-yl)phenyl) nicotinonitrile (tMCzPN) were designed and synthesized accordingly. With the same and simple mol. framework, tMCzPN successfully exhibits TADF behavior, while CzPN is a non-TADF fluorophor, as the addnl. steric hindrance of Me groups leads to a more twisted structure of tMCzPN. In the organic light-emitting diodes (OLEDs), tMCzPN exhibits extremely high forward-viewing maximum external quantum efficiency of 26.0%, without any light out-coupling enhancement, which is significantly higher than that of 5.3% for CzPN. These results indicate that tMCzPN is an excellent TADF emitter and proves that tMCz is a more appropriate candidate than Cz to develop TADF emitters. In the part of experimental materials, we found many familiar compounds, such as 3-Oxo-3-phenylpropanenitrile(cas: 614-16-4COA of Formula: C9H7NO)
3-Oxo-3-phenylpropanenitrile(cas: 614-16-4) has been used in the synthesis of substituted naphtho[1,8-bc]pyrans. It was also used as building block in the preparation of 4H-pyrans, 2-pyridones, furans and carbocyclics.COA of Formula: C9H7NO
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts