1380225-75-1Relevant academic research and scientific papers
The effect of molecular structure on the efficiency of 1,4-diazine–based D–(π)–A push-pull systems for non-doped OLED applications
Bogdanov, Pavel I.,Charushin, Valery N.,Chupakhin, Oleg N.,Degtyarenko, Konstantin M.,Gadirov, Ruslan M.,Grigoryev, Denis V.,Kozitsina, Alisa N.,Kurtcevich, Alexander E.,Kvashnin, Yuriy A.,Medvedeva, Margarita V.,Rusinov, Gennady L.,Samsonova, Lubov G.,Svalova, Tatyana S.,Verbitskiy, Egor V.
, (2021)
A series of novel D–A and D–π–A push-pull systems based on a pyrazine and quinoxaline acceptor, bearing various electron-donating triphenylamine and carbazole moieties, are compared. A significant difference in electrochemical and photophysical properties was found depending on molecular structure. The compounds have strong solvatochromic properties. Quinoxaline-containing systems exhibit delayed fluorescence (DF) in thermal vacuum deposition films. Despite the low quantum yield of fluorescence in the solid state (less than 10%), organic light-emitting diodes with sufficiently high efficiency (4.2 cd/A) have been fabricated on the basis of this push-pull systems. The best results were obtained for compounds exhibiting DF. The possible channel for increasing the efficiency of OLED can be associated with the “hot excitons” mechanism.
A highly efficient and aerobic protocol for the synthesis of N-heteroaryl substituted 9-arylcarbazolyl derivatives via a palladium-catalyzed ligand-free Suzuki reaction
Rao, Xiaofeng,Liu, Chun,Qiu, Jieshan,Jin, Zilin
supporting information, p. 7875 - 7883 (2013/06/27)
A palladium-catalyzed aerobic and ligand-free Suzuki reaction in aqueous ethanol has been developed for the synthesis of N-heteroaryl substituted 9-arylcarbazolyl derivatives. A number of N-heteroaryl halides, namely 2-halogenated pyridines, 2-bromoquinoline, 5-bromopyrimidine and 2-chloropyrazine, were coupled with 4-(9H-carbazol-9-yl)phenylboronic acid (CPBA) or 9-phenyl-9H-carbazol-3-ylboronic acid (PCBA) efficiently to afford good to excellent yields in a short reaction time. Moreover, the catalytic system of Pd(OAc)2-EtOH/H2O-K2CO3 was successfully extended to the cross-couplings of N-heteroaryl halides with various arylboronic acids. The results demonstrated that the cross-coupling reaction in the present protocol was promoted by oxygen.
