85877-63-0Relevant articles and documents
Novel quinoxaline luminescent material as well as preparation method and application thereof
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Paragraph 0045-0047, (2020/11/23)
The invention belongs to the field of organic semiconductor materials, and discloses a novel quinoxaline organic light-emitting material and a preparation method and application thereof. The quinoxaline luminescent material has a molecular structural formula shown in the specification, wherein R substituent is selected from one of halogen, substituted aromatic hydrocarbon with 5-30 carbon atoms, aryloxy with 6-50 ring atoms, aromatic amine with 5-30 carbon atoms, boron aromatic hydrocarbon with 6-20 carbon atoms, or aromatic heterocyclic group with 5-40 ring atoms. The organic light-emitting material disclosed by the invention has symmetrical and asymmetric functionalized quinoxaline molecular structures, substituent groups are introduced into specific 6 and 7 sites, the conjugation lengthis increased, and the coplanarity of molecules is destroyed, so that pi-pi accumulation is inhibited, the light-emitting efficiency and quantum yield of the material are improved, and the color regulation of the light-emitting material is relatively wide; therefore, the prepared organic luminescent material has good thermostability in air, is high in color purity and excellent in optical performance.
Ligand-controlled highly regioselective and asymmetric hydrogenation of quinoxalines catalyzed by ruthenium n-heterocyclic carbene complexes
Urban, Slawomir,Ortega, Nuria,Glorius, Frank
supporting information; experimental part, p. 3803 - 3806 (2011/06/20)
(Chemical Equation Presented) Inflating flat bicycles: Proper choice of the N-heterocyclic carbene (NHC) ligand in Ru NHC complexes allows the completely regioselective ligand-controlled hydrogenation of either the heterocyclic or the carbocyclic ring of
Spectral-luminescent properties of 2,3-diphenyl-6-X-quinoxalines
Rtishchev,Dobrodei,El'tsov
, p. 1658 - 1668 (2007/10/03)
A study is made of the spectral-luminescent properties of solutions of 2- and 6-phenylquinoxalines and 2,3-diphenyl-6-X-quinoxalines (X = H, CH3, OC2H5, NH2, C6H5, C6H5O, C6H5CHOH, I, Br, Cl) in a hydrocarbon and 95% ethanol at 295 and 77 K. The energies of the S1 and T1 states obtained (25 600-27 700 and 18 500-20 000 cm-1, respectively) are correlated to the nature of the substituents. The mixed character of the luminescence is inferred from the close location of the S(ππ*) and S(nπ*) levels for the majority of the compounds. The contribution from the ππ* component increases with increasing electron-donating power of the substituent, as well as in going from nonpolar to polar solvent. The quantum yields of fluorescence φ = 10-4-1.1 × 10-1, of the intercombination transition φST = 0.3-0.9, and of phosphorescence φph = 0.2-0.9, the phosphorescence lifetime (τph = 10-3-0.57 s), as well as the established phenomenon of phosphorescence of liquid solutions, are analyzed in the framework of the vibronic and spin-orbit coupling schemes and conformational changes caused by excitation. The difference in the luminescent properties of 2,3-diphenyl-6-aminoquinoxalines from its examined analogs is due to a low energy of the S1(ππ*) level (21 200 cm-1 in alcohol), which is responsible for intense fluorescence (φf -0.5 in alcohol) and very weak phosphorescence.
