Mondal, Dipanjan; Sardar, Gopa; Kabra, Dinesh; Balakrishna, Maravanji S. published an article in 2022, the title of the article was 2,2′-Bipyridine derived doubly B- N fused bisphosphine-chalcogenides, [C5H3N(BF2){NCH2P(E)Ph2}]2 (E = O, S, Se): tuning of structural features and photophysical studies.Product Details of 75449-26-2 And the article contains the following content:
2,2′-Bipyridine based bisphosphine [C5H3N{N(H)CH2PPh2}]2 (1) and its bischalcogenide derivatives [C5H3N{N(H)CH2P(E)Ph2}]2 (2, E = O; 3, E = S; 4, E = Se) were synthesized, and further reacted with BF3·Et2O/Et3N to form doubly B-N fused compounds [C5H3N(BF2){NCH2P(E)Ph2}]2 (5, E = O; 6, E = S; 7, E = Se) in excellent yields. The influence of the P=E bonds on the electronic properties of the doubly B-N fused systems and their structural features were investigated in detail, supported by extensive exptl. and computational studies. Compound 6 exhibited a very high quantum yield of ϕ = 0.56 in CH2Cl2, whereas compound 7 showed a least quantum yield of ϕ = 0.003 in acetonitrile. D. functional theory (DFT) calculations demonstrated that the LUMO/HOMO of compounds 5-7 mostly delocalized over the entire π-conjugated frameworks. The involvement of PE bonds in the HOMO energy level of these compounds follows the order: PO < PS < PSe. Time-correlated single photon counting (TCSPC) experiments of compounds 5-7 revealed the singlet lifetime of 4.26 ns for 6, followed by 4.03 ns for 5 and a lowest value of 2.18 ns (τ1) and 0.47 ns (τ2) with a double decay profile for 7. The authors' findings provide important strategies for the design of highly effective B-N bridged compounds and tuning their photophys. properties by oxidizing phosphorus with different chalcogens. Compounds 5 and 6 have been employed as green emitters (λem = 515 nm) in fluorescent organic light-emitting diodes (OLEDs). For compound 5, doped into the poly(9-vinylcarbazole) (PVK) matrix with 5 wt% doping concentration, nearly 90 Cd m-2 luminance with 0.022% external quantum efficiency (EQE) was achieved. The best performance was observed for compound 6 doped into PVK by 1 wt% having a maximum luminance of 350 Cd m-2 and a similar EQE value. The experimental process involved the reaction of [2,2'-Bipyridine]-3,3'-diamine(cas: 75449-26-2).Product Details of 75449-26-2
The Article related to boron bipyridinylbisphosphinylchalcogenide complex preparation frontier mol orbital fluorescence lifetime, fluorescence oled redox potential boron bipyridinylbisphosphinylchalcogenide complex, crystal structure boron bipyridinylbisphosphinylchalcogenide complex and other aspects.Product Details of 75449-26-2