475993-72-7Relevant academic research and scientific papers
Tuning the luminescence and electroluminescence of diphenylboron complexes of 5-substituted 2-(2′-pyridyl)indoles
Liu, Qinde,Mudadu, Maria S.,Schmider, Hartmut,Thummel, Randolph,Tao, Ye,Wang, Suning
, p. 4743 - 4749 (2008/10/08)
To examine the effect of substituent groups on the luminescence of BPh2(X-2-PI) complexes, three new air-stable boron complexes BPh2(F-2-PI) (5a), BPh2(Cl-2-PI) (5b), and BPh2(CH3O-2-PI) (5c) were synthesized and characterized, where F-2-PI = 5-fluoro-2-(2′-pyridyl)indole, Cl-2-PI = 5-chloro-2-(2′-pyridyl)indole, and CH3O-2-PI = 5-methoxyl-2-(2′-pyridyl)indole. In these complexes, the 5-substituted 2-PI ligand chelates in a tretrahedral fashion to the boron center. Compounds 5a-c are luminescent, with 5a having the highest emission efficiency. Compared with the emission maximum of BPh2(2-PI) (516 nm), the emission maximum of 5a and 5b is blue-shifted to 490 and 487 nm, respectively, while the emission of 5c is red-shifted to 532 nm, indicating the possibility of tuning the luminescence of these complexes by varying the substituent groups on the 2-PI ligand. An electroluminescent device using compound 5a as the emitter and the electron transport material has been fabricated.
