61613-22-7Relevant articles and documents
Highly efficient blue organic light-emitting diodes from pyrimidine-based thermally activated delayed fluorescence emitters
Li, Bowen,Li, Zhiyi,Hu, Taiping,Zhang, Yong,Wang, Ying,Yi, Yuanping,Guo, Fengyun,Zhao, Liancheng
, p. 2351 - 2359 (2018)
Three highly efficient blue thermally activated delayed fluorescence (TADF) emitters, 2SPAc-HPM, 2SPAc-MPM and 2SPAc-PPM, have been synthesised based on pyrimidine (PM), 2-methylpyrimidine (MPM) and 2-phenylpyrimidine (PPM) as the acceptor and 10H-spiro[acridan-9,9′-fluorene] (2SPAc) as the donor moiety. With their appropriate molecular design, these emitters successfully achieve small singlet-triplet splitting energies for efficient reverse intersystem crossing, and exhibit high photoluminescence quantum yields. As a result, TADF OLEDs based on 2SPAc-HPM, 2SPAc-MPM and 2SPAc-PPM emit blue light peaking at 479-489 nm and generate very high external quantum efficiencies of 25.56%, 24.34% and 31.45%, respectively. The 2SPAc-PPM-based TADF OLED is also one of the very few blue TADF emitters with an external quantum efficiency of more than 30%, and it has the best OLED performance among the pyrimidine-based TADF emitters.
Quinoline Ligands Improve the Classic Direct C?H Functionalisation/Intramolecular Cyclisation of Diaryl Ethers to Dibenzofurans
Mackey, Katrina,Jones, David J.,Pardo, Leticia M.,McGlacken, Gerard P.
supporting information, p. 495 - 498 (2021/01/12)
The C?H functionalisation approach to the synthesis of dibenzofurans is hampered by a number of problems. Herein we describe the evolution of a cheap, bench stable quinoline ligand, which obviates most of the current limitations and allows for a high yielding synthesis of a range of valuable dibenzofurans. Dibenzofurans are important motifs in natural products and compounds with wide biological activity.
Preparation method of 3 - bromo - N - phenyl carbazole
-
Paragraph 0024-0027; 0039-0042, (2021/10/11)
The invention relates to a preparation method of 3 -bromo - N -phenyl carbazole, and belongs to the technical field of organic chemistry. To the invention, diphenylamine serves as a starting raw material, and 2 -bromophenylaniline is obtained through bromination reaction. Then, intramolecular cyclization is carried out to obtain carbazole. Then, 3 - bromocarbazole is obtained by bromination reaction. Finally, a substituted 3 - bromo - N -phenyl carbazole is obtained. By controlling the concentration and reaction environment of the reactants, the selectivity of the reaction site is effectively improved, the used raw materials are simple and easy to obtain, the preparation period is relatively short, and the reaction process is simple and easy to control.