Category: 148231-12-3

Reference of 148231-12-3, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 148231-12-3, Name is 5,8-Dibromoquinoxaline, molecular formula is C8H4Br2N2. In a Article£¬once mentioned of 148231-12-3

Synthesis and characterization of new fluorene-acceptor alternating and random copolymers for light-emitting applications

A series of novel light-emitting copolymers consisted of 9,9-dihexylfluorene (F) and different acceptor segments, including quinoxaline (Q), 2,1,3-benzothiadiazole (BT) and thieno[3,4-b]-pyrazine (TP), were synthesized by the palladium-catalyzed Suzuki coupling reaction. Three fluorene-acceptor alternating copolymers (PFQ, PFBT, PFTP) and six F-TP (PFTP0.5-PFTP35) random copolymers were investigated and compared with the parent polyfluorene (PF). The experimental results suggest that the acceptor strength or content significantly affect the electronic and optoelectronic properties. The optical absorption maxima of the PF, PFQ, PFBT, and PFTP are 368, 416, 470, and 578 nm, respectively, which indicates the significance of intramolecular charge transfer. The electrochemical band gap also shows a similar trend. The incorporation of the acceptor into the PF lowers the LUMO level and thus could improve the electron-accepting ability of the PF. The emission maxima on the photoluminescence (PL) spectra of the PF, PFQ, PFBT, and PFTP films are 424, 493, 540, and 674 nm, which correspond to the color of blue, green, yellow, and red, respectively. It suggests that the full color of emission can be achieved by different acceptors. The significant positive solvatochromism on the PL spectra in different polar solvents suggests the efficient intramolecular charge transfer in PFTP. However, such charge transfer or heavy-atom effect results in fluorescence quenching and thus reduces the PL efficiencies. By random copolymerizing the TP into the PF, the PL efficiency could be improved. A significantly reduction on the PF emission peak with increasing the TP content suggests the energy transfer between the PF and TP segments. Besides, the characteristics on the electroluminescence (EL) devices of ITO/PEDOT:PSS/emissive layer/Ca/Ag suggest that such energy transfer results in the complete quenching of the PF emission at only 1% TP content in the PFTP01. The maximum external quantum efficiency (EQE) of the EL device based on the PFTP01 is superior to that of the PF due to the reduced LUMO level in matching with the Ca. The CIE 1931 coordinates of the PFTP01 based EL device under the condition of maximum EQE is (0.66, 0.31), which is close to the standard red of (0.66, 0.34) demanded by the National Television System Committee (NTSC). The luminescence characteristics based on the prepared polymers depend on the Foerster energy transfer or the intramolecular charge transfer, or heavy-atom fluorescence quenching. The present study suggests that the tuning of the electronic and optoelectronic properties could be achieved by incorporating various acceptors or content into the polyfluorenes.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Reference of 148231-12-3. In my other articles, you can also check out more blogs about 148231-12-3

Reference£º
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2050 | ChemSpider

Synthetic Route of 148231-12-3, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 148231-12-3, Name is 5,8-Dibromoquinoxaline, molecular formula is C8H4Br2N2. In a Article£¬once mentioned of 148231-12-3

New donor-functionalized Cp ligands: Synthesis and complexation behaviour of quinoxalyl and benzothiadiazolyl systems

Sodium cyclopentadienide reacts as nucleophile with 4,7-dibromo-2,1,3- benzothiadiazole (BTZ) and leads to the new donorfunctionalized ligand Cp BTZ. Related quinoxalyl Cp systems have been prepared using Pd-catalyzed coupling with zincated Cp-metal complexes. The new ligands comprise two N-donor atoms; one of them is located in a distal position relative to the metal centre so that it cannot coordinate in a chelating manner. With Cp BTZ ligand derivatives several metal complexes have been synthesized. The new chromium(III) complex CpBTZCrCl2 (12) becomes upon activation an active catalyst for the polymerization of ethylene. Relying on DFT calculations and analysis of spin-density distribution, combined with paramagnetic NMR data a chelating coordination of the CpBTZ ligand is feasible in 12.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2043 | ChemSpider

Chemistry is traditionally divided into organic and inorganic chemistry. Quality Control of 5,8-Dibromoquinoxaline, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 148231-12-3

organic semiconductor compound, manufacturing method thereof, and organic electronic device that contains it

The present invention refers to organic semiconductor compound, and manufacturing method thereof including relates to organic electronic devices, including qinoxalines in more specifically comprises an organic semiconductor compound and is, and manufacturing method thereof including relates organic electronic devices. (S) sulfur in addition and that includes an input and thiophene derivatives by combining together […] compound and represents the gap a low the minute particles are produced by, including organic electronic devices of the present invention same the photoactive layer and that comprises an organic semiconductor compound and that is epoch-making a fullerene derivatives have a high efficiency by use of the combination that varies. In addition of the present invention that comprises an organic semiconductor compound and high thermal stability and high solubility due to organic electronic devices including same has at least contains an alkaline halide in particular organic electronic devices, organic solar cells or of organic TFT highly available as n-type material can be. (by machine translation)

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2017 | ChemSpider

Synthetic Route of 148231-12-3, Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Patent, and a compound is mentioned, 148231-12-3, 5,8-Dibromoquinoxaline, introducing its new discovery.

DERIVATIVES OF QUINOLINES AND QUINOXALINES AS PROTEIN TYROSINE KINASE INHIBITORS

The invention relates to compounds of Formula (I), wherein the substituens are as defined in the specification, in free form or in the form of a pharmaceutically acceptable salt, solvate, ester, N-oxide thereof; processes for the preparation thereof; to pharmaceuticals containing such compounds, in particular for the use in one or more Protein tyrosine kinase mediated diseases.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2016 | ChemSpider

Chemistry is traditionally divided into organic and inorganic chemistry. HPLC of Formula: C8H4Br2N2, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 148231-12-3

Synthesis of organosilicon polymers containing donor-acceptor type pi-conjugated units and their applications to dye-sensitized solar cells

Novel organosilicon polymers having donor-acceptor type pi-conjugated units in the backbone were prepared by Stille-coupling reactions of bis(tributylstannylthienyl)silanes with diiodoquinoxialine, benzothiadiazole, and benzothiaselenazole. Dehaloganative copolymerization of di(bromothienyl)silanes and dibromoquinoxaline was also studied, which gave the corresponding random copolymer. Applications of these polymers to dye-sensitized solar cells (DSSCs) were examined and it was found that the polymer containing benzoselenadiazole units as the acceptor exhibited the best performance as the sensitizer among the present polymers.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2040 | ChemSpider

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, category: quinoxaline, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 148231-12-3, Name is 5,8-Dibromoquinoxaline, molecular formula is C8H4Br2N2

SULFONE DERIVATIVES AND THEIR USE AS PKM2 MODULATORS FOR THE TREATMENT OF CANCER

Provided herein is novel compound of the general formula (I), its tautomeric forms, its stereoisomers, its analogs, its prodrugs, its isotopes, its N- oxides, its metabolites, its pharmaceutically acceptable salts, its polymorphs, its solvates, its optical isomers, its clathrates, its co-crystals, its combinations with suitable medicament and pharmaceutical compositions comprising the same. Also provided is method of treating a disease responsive to activation of human PKM2 by administration of said compound and its use as PKM2 modulator in various pathological conditions.

One of the oldest and most widely used commercial enzyme inhibitors is aspirin, category: quinoxaline, which selectively inhibits one of the enzymes involved in the synthesis of molecules that trigger inflammation. you can also check out more blogs about 148231-12-3

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2015 | ChemSpider

148231-12-3, Name is 5,8-Dibromoquinoxaline, belongs to quinoxaline compound, is a common compound. Safety of 5,8-DibromoquinoxalineIn an article, once mentioned the new application about 148231-12-3.

Toward a rational design of poly(2,7-carbazole) derivatives for solar cells

On the basis of theoretical models and calculations, several alternating polymeric structures have been investigated to develop optimized poly(2,7-carbazole) derivatives for solar cell applications. Selected low band gap alternating copolymers have been obtained via a Suzuki coupling reaction. A good correlation between DFT theoretical calculations performed on model compounds and the experimental HOMO, LUMO, and band gap energies of the corresponding polymers has been obtained. This study reveals that the alternating copolymer HOMO energy level is mainly fixed by the carbazole moiety, whereas the LUMO energy level is mainly related to the nature of the electron-withdrawing comonomer. However, solar cell performances are not solely driven by the energy levels of the materials. Clearly, the molecular weight and the overall organization of the polymers are other important key parameters to consider when developing new polymers for solar cells. Preliminary measurements have revealed hole mobilities of about 1 ¡Á 10-3 cm2¡¤V-1¡¤s-1 and a power conversion efficiency (PCE) up to 3.6%. Further improvements are anticipated through a rational design of new symmetric low band gap poly(2,7-carbazole) derivatives.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2022 | ChemSpider

In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 148231-12-3, name is 5,8-Dibromoquinoxaline, introducing its new discovery. COA of Formula: C8H4Br2N2

Dramatically enhanced fluorescence of heteroaromatic chromophores upon insertion as spacers into oligo(triacetylene)s

In continuation of a previous study on the modulation of pi-electron conjugation of oligo(triacetylene)s by insertion of central hetero-spacer fragments between two (E)-hex-3-ene-1,5-diyne ((E)-1,2-diethynylethene, DEE) moieties (Fig. 1), a new series of trimeric hybrid oligomers (14-18 and 22-24, Fig. 2) were prepared (Schemes 1-3). Spacers used were both electron-deficient (quinoxaline-based heterocycles, pyridazine) and electron-rich (2,2?-bithiophene, 9,9-dioctyl-9H-fluorene) chromophores. With 19-21 (Scheme 4), a series of transition metal complexes was synthesized as potential precursors for nanoscale scaffolding based on both covalent acetylenic coupling and supramolecular assembly. The UV/VIS spectra (Fig. 3) revealed that the majority of spacers provided heterotrimers featuring extended pi-electron delocalization. The new hybrid chromophores show a dramatically enhanced fluorescence compared with the DEE dimer 13 and homo-trimer 12 (Fig. 5). This increase in emission intensity appears as a general feature of these systems: even if the spacer molecule is non-fluorescent, the corresponding hetero-trimer may show a strong emission (Table 2). The redox properties of the new hybrid chromophores were determined by cyclic voltammetry (CV) and rotating-disk voltammetry (RDV) (Table 3 and Fig. 5). In each case, the first one-electron reduction step in the hetero-trimers appeared anodically shifted compared with DEE dimer 13 and homo-trimer 12. With larger spacer chromophore extending into two dimensions (as in 14-18, Fig. 2), the anodic shift (by 240-490 mV, Table 3) seems to originate from inductive effects of the two strongly electron-accepting DEE substituents rather than from extended pi-electron conjugation along the oligomeric backbone, as had previously been observed for DEE-substituted porphyrins.

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2026 | ChemSpider

Chemistry is traditionally divided into organic and inorganic chemistry. Application In Synthesis of 5,8-Dibromoquinoxaline, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 148231-12-3

Red-light-emitting system based on aggregation of donor-acceptor derivatives in polar aqueous media

Glowing together: An efficient red-light-emitting system has been created in polar water media based on the aggregation of donor-acceptor molecules. In the THF/water mixture, the emission was quenched when a small volume of water was used, whereas it was recovered and enhanced upon aggregate formation with a large water volume. Copyright

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2029 | ChemSpider

Synthetic Route of 148231-12-3, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.148231-12-3, Name is 5,8-Dibromoquinoxaline, molecular formula is C8H4Br2N2. In a Article£¬once mentioned of 148231-12-3

A Palette of Fluorescent Thiophene-Based Ligands for the Identification of Protein Aggregates

By replacing the central thiophene unit of an anionic pentameric oligothiophene with other heterocyclic moities, a palette of pentameric thiophene-based ligands with distinct fluorescent properties were synthesized. All ligands displayed superior selectivity towards recombinant amyloid fibrils as well as disease-associated protein aggregates in tissue sections.

A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 148231-12-3

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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2044 | ChemSpider