27012-25-5Relevant articles and documents
Platinum(ii) polymetallayne-based phosphorescent polymers with enhanced triplet energy-transfer: Synthesis, photophysical, electrochemistry, and electrophosphorescent investigation
Huang, Zuan,Liu, Boao,Zhao, Jiang,He, Yue,Yan, Xiaogang,Xu, Xianbin,Zhou, Guijiang,Yang, Xiaolong,Wu, Zhaoxin
, p. 36507 - 36519 (2015)
Two series of new phosphorescent copolymers with bicarbazole-based platinum(ii) polymetallayne backbones have been successfully prepared through Sonogashira cross-coupling with different IrIII ppy-type (ppy = 2-phenylpyridine anion) complexes as phosphorescent centers. The photophysical investigations not only indicate a highly efficient triplet energy-transfer process from the polymetallayne segments to the phosphorescent units in the polymer solution, but also figure out the structure-property relationship between the triplet energy-transfer process and the energy-levels of different excited states. In addition, the phosphorescent copolymers can produce yellow-emitting phosphorescent OLEDs (PHOLEDs) with high EL efficiencies and a current efficiency (ηL) of 11.49 cd A-1, an external quantum efficiency (ηext) of 4.38%, a power efficiency (ηP) of 3.78 lm W-1, and red-emitting PHOLEDs with a ηL of 5.86 cd A-1, ηext of 10.1%, and a ηP of 2.29 lm W-1, representing very decent electroluminescent performances achieved by the phosphorescent copolymers. Herein, this work not only furnishes very important clues for further polishing of this category novel phosphorescent polymer, but also provides a new approach to the design and synthesis of highly efficient phosphorescent copolymers.
Method for simultaneously synthesizing 5-bromo-2-phenylpyridine and 2-(4-bromophenyl)pyridine in one step without metal catalysis
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Paragraph 0032-0070, (2020/08/22)
The invention discloses a method for simultaneously synthesizing 5-bromo-2-phenylpyridine and 2-(4-bromophenyl)pyridine in one step without metal catalysis. The method specifically comprises the following steps: uniformly mixing 2-phenylpyridine, a bromine source, an oxidizing agent and an organic solvent according to a ratio to obtain a mixed reaction solution, then heating the reaction solutionto 60-100 DEG C, carrying out a constant-temperature stirring reaction for 2-12 h, and after the reaction is finished, separating the product by using thin-layer chromatography. According to the preparation method disclosed by the invention, a metal-free catalyzed 2-phenylpyridine C-H bond bromination mode is used for replacing a palladium catalyzed Suzuki coupling reaction which is widely used atpresent to synthesize 5-bromo-2-phenylpyridine and 2-(4-bromophenyl)pyridine. The method has the advantages that the reaction conditions are mild and the conversion rate of 2-phenylpyridine is high,wherein the two products of 5-bromo-2-phenylpyridine and 2-(4-bromophenyl)pyridine can be synthesized at the same time; the reaction process is simple, the cost is low, the products are easy to separate and purify, and the products are free of metal residues.
Phosphorescent cyanide sensor based on a 2-phenylpyridine(ppy)-type cyclometalated Ir(III) complex bearing dimesitylboron group with concentration distinguishing ability
Feng, Zhao,Li, Huiying,Li, Yingju,Liu, Boao,Sun, Yuanhui,Yang, Zhimao,Yao, Chaofan,Zhong, Daokun,Zhou, Guijiang
supporting information, (2020/04/21)
With a 2-phenylpyridine(ppy)-type cyclometalated Ir(III) complex with –B(Mes)2 group Ir–B, the CNˉ ions can bind effectively with the boron atom in the –B(Mes)2 group to furnish CNˉ sensing ability through induc