1479-24-9Relevant articles and documents
Investigations of luminescent behavior and intramolecular energy transfer mechanism of europium(III) complexes with fluorinated β-ketoester ligand
Devi, Rekha,Bala, Manju,Khatkar, S. P.,Taxak, V. B.,Boora, Priti
, p. 36 - 44 (2016)
A fluorinated β-ketoester ligand, ethyl-(2-fluorobenzoyl) acetate (EFBA) has been employed to synthesized new europium binary and ternary complexes with ancillary ligands neocuproine (neo), bathophenanthroline (batho), 1,10-phenanthroline (phen) and 2,2-bipyridyl (bipy) in high yield by the solution precipitation method. The ligand (EFBA) and the synthesized complexes Eu(EFBA)3·(H2O)2 (C1), Eu(EFBA)3·neo (C2), Eu(EFBA)3·batho (C3), Eu(EFBA)3·phen (C4), Eu(EFBA)3·bipy (C5) were characterized by elemental analysis, 1H NMR, IR, UV-vis, thermal analysis (TG/DTG) and luminescence spectroscopy. The thermal analysis results show that the complex is stable up to 231 °C temperature which is sufficient for the normal working of OLEDs. The luminescence measurements indicate that π electron rich organic ligand ethyl-(2-fluorobenzoyl) acetate possessing high absorption coefficient acts as a suitable chromophoric moiety for the transfer of energy to the central Eu3+ ion by the process of sensitization, this results in strong emissions band in red spectral region attributed to electric dipole 5D0 → 7F2 transition of europium ion. The luminescence intensity further enhanced by the introduction of N-containing ancillary ligands neocuproine, bathophenanthroline, 1,10-phenanthroline, and 2,2-bipyridyl in the ternary complexes C2-C5 because these ligands replace the solvent molecule in the coordination sphere and satisfy the coordination number around central europium ion. The sensitization process in europium complexes is investigated through the proposed energy transfer mechanism. The decay curves observations show the similar chemical environment around the europium ion in all the complexes.
Construction of isoxazolone-fused phenanthridinesviaRh-catalyzed cascade C-H activation/cyclization of 3-arylisoxazolones with cyclic 2-diazo-1,3-diketones
Hu, Wangcheng,He, Xinwei,Zhou, Tongtong,Zuo, Youpeng,Zhang, Shiwen,Yang, Tingting,Shang, Yongjia
supporting information, p. 552 - 556 (2021/02/06)
A Rh(iii)-catalyzed cascade C-H activation/intramolecular cyclization of 3-aryl-5-isoxazolones with cyclic 2-diazo-1,3-diketones was described, leading to the formation of isoxazolo[2,3-f]phenanthridine skeletons. The protocol features the simultaneous one-pot formation of two new C-C/C-N bonds and one heterocycle in moderate-to-good yields with good functional group compatibility. It is amenable to large-scale synthesis and further transformation.
3-pyridinesulfonyl-1-N-heteropyrrole derivatives capable of treating peptic ulcer as well as preparation method and application thereof
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Paragraph 0083-0087, (2020/11/26)
The invention discloses 3-pyridinesulfonyl-1-N-heteropyrrole derivatives capable of treating peptic ulcer as well as a preparation method and application of the derivative, and particularly provides compounds as shown in a formula I, or pharmaceutically a
