1575-37-7Relevant articles and documents
An improved understanding of the reaction of bis(bromomethyl)quinoxaline 1-N-oxides with amines using substituent effects
Evans, Kathryn M.,Slawin, Alexandra M. Z.,Lebl, Tomas,Philp, Douglas,Westwood, Nicholas J.
, p. 3186 - 3193 (2007)
(Chemical Equation Presented) The reaction of bis(bromomethyl)quinoxaline N-oxides with amines is interesting from a reaction mechanism perspective and due to the reported biological activity of compounds in this general class. The complex mechanism of th
Fluorene- and benzimidazole-based blue light-emitting copolymers: Synthesis, photophysical properties, and PLED applications
Zhu, Haifeng,Tong, Hui,Gong, Yongyang,Shao, Shiyang,Deng, Chunmei,Yuan, Wang Zhang,Zhang, Yongming
, p. 2172 - 2181 (2012)
Blue light-emitting materials are receiving considerable academic and industrial interest due to their potential applications in optoelectronic devices. In this study, blue light-emitting copolymers based on 9,9'-dioctylfluorene and 2,2'-(1,4-phenylene)-bis(benzimidazole) moieties were synthesized through palladium-catalyzed Suzuki coupling reaction. While the copolymer consisting of unsubstituted benzimidazoles (PFBI0) is insoluble in common organic solvents, its counterpart with N-octyl substituted benzimidazoles (PFBI8) enjoys good solubility in toluene, tetrahydrofuran, dichloromethane (DCM), and chloroform. The PFBI8 copolymer shows good thermal stability, whose glass transition temperature and onset decomposition temperature are 103 and 428 °C, respectively. Its solutions emit blue light efficiently, with the quantum yield up to 99% in chloroform. The electroluminescence (EL) device of PFBI8 with the configuration of indium-tin oxide/poly(ethylenedioxythiophene): poly(styrene sulfonic acid)/PFBI8/1,3,5-tris(1-phenyl-1H-benzimidazole-2-yl) benzene/LiF/Al emits blue light with the maximum at 448 nm. Such unoptimized polymer light-emitting diode (PLED) exhibits a maximum luminance of 1534 cd/m2 with the current efficiency and power efficiency of 0.67 cd/A and 0.20 lm/W, respectively. The efficient blue emission and good EL performance make PFBI8 promising for optoelectronic applications. 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012 A conjugated polymer based on 9,9'-dioctylfluorene and N-octyl substituted 2,2'-(1,4-phenylene)- bis(benzimidazole) moieties (PFBI8) was synthesized. Its solutions emit blue light efficiently, with the quantum yield up to 99% in chloroform. It is also morphologically and thermally stable, with glass transition temperature and decomposition temperature as high as 103 and 428 °C, respectively. The polymer light-emitting diode using PFBI8 as the active emitting layer exhibits blue emission (448 nm) with the maximum luminance, current efficiency and power efficiency of 1534 cd/m2, 0.67 cd/A, and 0.20 lm/W, respectively. Copyright
Efficiency of the Urushibara nickel catalyzed atmospheric hydrogenation in the synthesis of aniline derivatives
Liu,Jia,Chen,Jiang,Zhang,Huang
, p. 485 - 488 (2000)
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Design and development of dithienopyrrolobenzothiadiazole (DTPBT)-based rigid conjugated polymers with improved hole mobilities
Bhanvadia, Viraj J.,Machhi, Hiren K.,Soni, Saurabh S.,Zade, Sanjio S.,Patel, Arun L.
, (2020/10/12)
Donor-acceptor integrated ladder-type dithienopyrrolobenzothiadiazole (DTPBT)-based conjugated building blocks have been used to develop rigid conjugated polymers by copolymerizing them with synthesized ladder-type indoloquinoxaline, π-extended isoindigo and π-extended 2,1,3-benzothiadiazole-based conjugated building blocks. Structural aspects of synthesized building blocks are studied by single-crystal X-ray diffraction, which revealed the co-planar structure of indoloquinoxaline-scaffold while twisted but intramolecularly hydrogen-bonded structures of π-extended isoindigo- and 2,1,3-benzothiadiazole-scaffolds with number of intermolecular non-bonding interactions. The synthesized DTPBT-based conjugated polymers P-1, P-2 and P-3 are studied for photophysical and electrochemical properties and are found to have moderate to good visible light absorptivity with HOMO energy levels below ?5.0 eV. The X-ray diffraction studies indicate strong π?π stacking interactions induced face-on arrangement of polymer chains respective to the substrate. Polymers show π?π stacks promoted high space-charge limited current (SCLC) hole mobilities ranging between 5.6 × 10?4 –1.3 × 10?3 cm2V?1s?1. The obtained SCLC hole mobility data in tandem with the studied structural aspects of monomers and morphological aspects of polymers, suggest that the combination of ladder-type DTPBT-scaffolds (capable of intermolecular π?π interactions) with non-ladder-type planar and structurally rigid π-extended conjugated scaffolds (capable of intermolecular π?π and other non-bonding interactions) is beneficial for getting good hole mobilities.
A Common, Facile and Eco-Friendly Method for the Reduction of Nitroarenes, Selective Reduction of Poly-Nitroarenes and Deoxygenation of N-Oxide Containing Heteroarenes Using Elemental Sulfur
Cerecetto, Hugo,Romero, Angel H.
supporting information, (2020/03/23)
A transition metal-free, environment-friendly and practical protocol was developed either for the reduction of nitroarenes or for the deoxygenation of N-oxide containing heteroarenes. The reaction proceeded with the use of a non-toxic and cheap feedstock as elemental sulfur in aqueous methanol under relatively mild conditions. Green chemistry credentials were widely favorable compared to traditional and industrial protocols with good E-factors and a low production of waste. The strategy allowed the efficient reduction of a large variety of substituted-nitroarenes including various o-nitroanilines as well as selective reduction of various poly-nitroarenes in excellent yields with a broad substrate scope. The protocol was successfully extended to the deoxygenation of some N-oxide containing heteroarenes, like benzofuroxans, phenazine N,N'-dioxides, pyridine N-oxides, 2H-indazole N1-oxides, quinoxaline N1,N4-dioxides and benzo[d]imidazole N1,N3-dioxides. A gram-scale example for the synthesis of luminol, in green conditions, was reported. A solid mechanism of reaction was proposed from experimental evidences.
