Reference of 2,6-DibromopyridineIn 2022 ,ãMulti-resonant thermally activated delayed fluorescence emitters based on tetracoordinate boron-containing PAHs: colour tuning based on the nature of chelatesã?was published in Chemical Science. The article was written by Meng, Guoyun; Liu, Lijie; He, Zhechang; Hall, David; Wang, Xiang; Peng, Tai; Yin, Xiaodong; Chen, Pangkuan; Beljonne, David; Olivier, Yoann; Zysman-Colman, Eli; Wang, Nan; Wang, Suning. The article contains the following contents:
Multi-resonant thermally activated delayed fluorescence (MR-TADF) materials have attracted considerable attention recently. The mol. design frequently incorporates cycloboration. However, to the best of our knowledge MR-TADF compounds containing nitrogen chelated to boron are still unknown. Reported herein is a new class of tetracoordinate boron-containing MR-TADF emitters bearing CNC- and NNN-chelating ligands. We demonstrate that the replacement of the B-C covalent bond in the CNC-chelating ligand by the B-N covalent bond affords an isomer, which dramatically influences the optoelectronic properties of the mol. The resulting NNN-chelating compounds show bathochromically shifted absorption and emission spectra relative to CNC-chelating compounds The incorporation of a tert-butylcarbazole group at the 4-position of the pyridine significantly enhances both the thermal stability and the reverse intersystem crossing rate, yet has a negligible effect on emission properties. Consequently, high-performance hyperfluorescent organic light-emitting diodes (HF-OLEDs) that utilize these mols. as green and yellow-green emitters show a maximum external quantum efficiency (ηext) of 11.5% and 25.1%, and a suppressed efficiency roll-off with an ηext of 10.2% and 18.7% at a luminance of 1000 cd m-2, resp. In the experiment, the researchers used many compounds, for example, 2,6-Dibromopyridine(cas: 626-05-1Reference of 2,6-Dibromopyridine)
2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. Pyridines, quinolines, and isoquinolines have found a function in almost all aspects of organic chemistry. Pyridine has found use as a solvent, base, ligand, functional group, and molecular scaffold. As structural elements, these moieties are potent electron-deficient groups, metal-directing functionalities, fluorophores, and medicinally important pharmacophores. Reference of 2,6-Dibromopyridine