Category: 52431-30-8

Xiao, Zuo published the artcilePushing Fullerene Absorption into the Near-IR Region by Conjugately Fusing Oligothiophenes, HPLC of Formula: 52431-30-8, the publication is Angewandte Chemie, International Edition (2012), 51(36), 9038-9041, S9038/1-9038/27, database is CAplus and MEDLINE.

By fusing the π-electron systems of oligothiophene and fullerene through the open-cage strategy, the visible absorbance of fullerenes was significantly enhanced and pushed their absorption into NIR region. This optical property improvement concerns the following factors: (1) symmetry breaking of the fullerene by open-cage reactions allows more low-energy transitions to take place; (2) addnl. absorption is taken by external chromophore; and (3) strong cross-talking between the donor and acceptor in the conjugated system leads to ICT absorbance in the NIR region. Therefore, the open-cage strategy provides a promising approach for creating new materials with advanced optical properties. Future work is focused on developing novel NIR-absorbing fullerene materials and applying them in organic solar cells and nonlinear optics.

Angewandte Chemie, International Edition published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C6H12N2O, HPLC of Formula: 52431-30-8.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Zhou, Jinjun published the artcileTuning Energy Levels of Low Bandgap Semi-Random Two Acceptor Copolymers, Application of 2,5-Dibromo-3,4-dinitrothiophene, the publication is Macromolecules (Washington, DC, United States) (2013), 46(9), 3391-3394, database is CAplus.

A series of low bandgap semi-random copolymers incorporating various ratios of two acceptor units – thienothiadiazole and benzothiadiazole – were synthesized by Pd-catalyzed Stille coupling. The polymer films exhibited broad and intense absorption spectra, covering the spectral range from 350 nm up to 1240 nm. The optical bandgaps and HOMO levels of the polymers were calculated from UV-visible spectroscopy and cyclic voltammetry measurements, resp. By changing the ratio of the two acceptor monomers, the HOMO levels of the polymers were tuned from -4.42 to -5.28 eV and the optical bandgaps were varied from 1.00 to 1.14 eV. The results indicate our approach could be applied to the design and preparation of conjugated polymers with specifically desired energy levels and bandgaps for photovoltaic applications.

Macromolecules (Washington, DC, United States) published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C11H16BNO3S, Application of 2,5-Dibromo-3,4-dinitrothiophene.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Gao, Baoxiang published the artcileBand gap tunable for near-infrared absorbing chromophores with multi-triphenylamine and tris (thieno)hexaazatriphenylenes acceptors, HPLC of Formula: 52431-30-8, the publication is Tetrahedron Letters (2010), 51(14), 1919-1921, database is CAplus.

Two disk-like D-A type chromophores with multi-triphenylamine donors and hexaazatriphenylene acceptors were synthesized and fully characterized by ¹H and ¹³C NMR, elemental anal. and mass spectrometry. The effects of the hexaazatriphenylene on the optical and electrochem. properties and band gap of the chromophores were investigated. As the hexaazatriphenylene core fused with three thiophene rings, the band gaps of the compounds could be tuned from 1.65 eV to 1.15 eV. The π-π* absorption peak and charge-transfer absorption peak of the hexaazatriphenylene compounds were red shifted from visible spectrum region (393 and 530 nm) to near-IR spectrum region (542 and 756 nm). In addition, due to an increase in the π electronic coupling between electron donor and electron acceptor, the extinction coefficient (charge-transfer absorption) of the hexaazatriphenylene compound decreases 85% from 3.4 × 10⁴ mol^-1 dm^-3 cm^-1 to 0.5 × 10⁴ mol^-1 dm^-3 cm^-1.

Tetrahedron Letters published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, HPLC of Formula: 52431-30-8.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Li, Zhitao published the artcileAnalysis of coal tar pitch and smoke extract components and their cytotoxicity on human bronchial epithelial cells, Formula: C4Br2N2O4S, the publication is Journal of Hazardous Materials (2011), 186(2-3), 1277-1282, database is CAplus and MEDLINE.

Coal tar pitch and its smoke are considered hazardous byproducts and common pollutants generated by the coal processing industry. This work characterized coal tar pitch and its smoke extracts by gas chromatog./mass spectrometry (GC/MS) using dimethylsulfoxide. Only 0.3025% of components in total coal tar pitch were identified by GC/MS. Among 18 identified compounds, polycyclic aromatic hydrocarbons (PAH) has the highest relative abundance (0.19%). Remaining components were composed of monocyclic aromatic hydrocarbons, heterocyclic compounds, and alkenes. Among 38 coal tar pitch smoke extract constituents profiled, 87.91% were PAH; the remaining 12.09% were composed of monocyclic aromatic hydrocarbons, heterocyclic compounds, and alkenes. The cytotoxic effect of coal tar pitch and its smoke extracts on BEAS-2B cells were also evaluated using the MTT assay. BEAS-2B cells exposed to coal tar pitch exhibited a non dose-dependent, U-shaped cytotoxicity with the maximum ID of 3.75 mg/L. BEAS-2B cells exposed to coal tar pitch smoke extracts exhibited dose-dependent cytotoxicity with a 8.64 mg/L LC₅₀. Results demonstrated the significant different composition and cytotoxicity of coal tar pitch and its extracts, suggesting 2 underlying mechanisms which are pending future investigation.

Journal of Hazardous Materials published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Formula: C4Br2N2O4S.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Xie, Ke published the artcilePoly(3,4-dinitrothiophene)/SWCNT composite as a low overpotential hydrogen evolution metal-free catalyst, Quality Control of 52431-30-8, the publication is Journal of Materials Chemistry A: Materials for Energy and Sustainability (2015), 3(1), 78-82, database is CAplus.

A novel metal-free H evolution reaction catalyst made of poly(3,4-dinitrothiophene)/SWCNT was developed. This catalyst presents a good H evolution reaction activity with a lower overpotential than metallic catalysts. Its performance was optimized to an overpotential of ∼0.040 V and a H generation rate of 44.2 μmol h^-1 cm^-2.

Journal of Materials Chemistry A: Materials for Energy and Sustainability published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C9H9NO, Quality Control of 52431-30-8.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Schluetter, Florian published the artcileSynthesis and Characterization of New Self-Assembled Metallo-Polymers Containing Electron-Withdrawing and Electron-Donating Bis(terpyridine) Zinc(II) Moieties, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Macromolecules (Washington, DC, United States) (2010), 43(6), 2759-2771, database is CAplus.

A series of rigid π-conjugated bis(terpyridines) (M1-M7) bearing electron-acceptor spacer units in 4′-position was synthesized in moderate to high yields by Pd⁰-catalyzed Sonogashira cross-coupling reactions. The compounds were fully characterized by NMR spectroscopy, MALDI-TOF mass spectrometry, elemental anal. and their photophys. properties were discussed in detail. These new bis(terpyridines) were applied for the self-assembly reaction with Zn^II ions to form metallo-homo polymers (P1-P7). Broadened NMR signals and UV-vis titration experiments confirmed the successful polymerization The electro-optical properties of the materials were investigated in detail. Band gaps up to 2.08 eV and bright blue to orange photoluminescence with quantum yields of 18 to 66% were observed strongly depending on the nature of the π-conjugated bis(terpyridine) system. In combination with electron-donor ditopic terpyridine ligands (MD1 and MD2), two Zn^II random copolymers (R1 and R2) were synthesized. These materials were investigated by UV-vis absorption and photoluminescence experiments in dilute solution and in the solid state, prepared by spin-coating from DMF solutions Thereby, random copolymer R2 featured an energy transfer from the donor to the acceptor part in dilute solution

Macromolecules (Washington, DC, United States) published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Luecke, Ana-Luiza published the artcilePalladium complexes of anionic N-heterocyclic carbenes derived from sydnones in catalysis, Quality Control of 52431-30-8, the publication is Zeitschrift fuer Naturforschung, B: A Journal of Chemical Sciences (2016), 71(6), 643-650, database is CAplus.

The anion of N-phenylsydnone, which can be generated on treatment of N-phenylsydnone with cyanomethyllithium without decomposition, can be represented as tripolar zwitterionic and as anionic N-heterocyclic carbene resonance forms. Its Pd complex was prepared from 4-bromo-3-phenylsydnone and tetrakis(triphenylphosphine)palladium and is active as catalyst in Suzuki-Miyaura reactions. Thus, 2,5-dibromo-3,4-dinitrothiophene was effectively converted into 2,5-diaryl-3,4-dinitrothiophenes with 1-naphthyl-, (4-trifluoromethoxy)phenyl-, [4-(methylsulfanyl)phenyl]- and (biphenyl-4-yl)boronic acid. 3-(Phenanthren-9-yl)quinoline was prepared by Suzuki-Miyaura reaction starting from 3-bromoquinoline. 1-Chloro-2,4-dinitrobenzene cross-coupled with Ph boronic acid, 1-naphthylboronic acid and 9-phenanthrylboronic acid. 4-Bromobenzylic alc. gave (4-isopropylphenyl)methanol on sydnone-Pd complex-catalyzed reaction with iso-Pr boronic acid.

Zeitschrift fuer Naturforschung, B: A Journal of Chemical Sciences published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Quality Control of 52431-30-8.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Lu, Mengxia published the artcileSynthesis of D-A low-bandgap polymer-based thieno[3,4-b]pyrazine and benzo[1,2-b:4,5-b’]dithiophene for polymer solar cells, Related Products of bromides-buliding-blocks, the publication is Polymer Bulletin (Heidelberg, Germany) (2017), 74(2), 603-614, database is CAplus.

Three D-A low-bandgap polymer-based benzo[1,2-b:4,5-b’]dithiophene (BDT) and thieno[3,4-b]pyrazine (TP) unit with different substituents were synthesized using Stille coupling. The substituent effects were explored. It is found that attaching the Ph group at the 2,3-positions of thienopyrazine unit is beneficial to good coplanarity and regularity of mol. packing. Meanwhile, attaching the longer alkoxyl side chain at BDT unit or Ph group at the 2,3-positions of thienopyrazine unit had the relatively deep HOMO (LUMO) energy levels. The three D-A polymers showed good thermal stability and exhibited broad absorption, low bandgap, and order packing structure. As a result, the highest PCE of 1.50 % was achieved for the polymer P2 with the substituents, including hexyldecyloxyl at the BDT unit and Ph at the TP unit.

Polymer Bulletin (Heidelberg, Germany) published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Related Products of bromides-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Luo, Min published the artcileSynthesis and Optical Properties of Soluble Near-Infrared Arylene Bisthienoimidazole Dyes, COA of Formula: C4Br2N2O4S, the publication is Organic Letters (2011), 13(15), 4092-4095, database is CAplus and MEDLINE.

Soluble, film-forming near-IR arylene bisthienoimidazole dyes with a band gap of 1.2-1.3 eV are electrochromic and absorb strongly at the telecommunication wavelengths (1310 and 1550 nm) in the oxidized state.

Organic Letters published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, COA of Formula: C4Br2N2O4S.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Xu, Xiaofeng published the artcilePyrrolo[3,4-g]quinoxaline-6,8-dione-based conjugated copolymers for bulk heterojunction solar cells with high photovoltages, Formula: C4Br2N2O4S, the publication is Polymer Chemistry (2015), 6(25), 4624-4633, database is CAplus.

A new electron-deficient building block 5,9-di(thiophen-2-yl)-6H-pyrrolo[3,4-g]quinoxaline-6,8(7H)-dione (PQD) was synthesized via functionalizing the 6- and 7-positions of quinoxaline (Qx) with a dicarboxylic imide moiety. Side chain substitution on the PQD unit leads to good solubility which enables very high mol. weight copolymers to be attained. The fusion of two strong electron-withdrawing groups (Qx and dicarboxylic imide) makes the PQD unit a stronger electron-deficient moiety than if the unit had just one electron-withdrawing group, thus enhancing the intramol. charge transfer between electron-rich and deficient units of the copolymer. Four PQD-based polymers were synthesized which feature deep-lying HOMO (HOMO) levels and bathochromic absorption spectra when compared to PBDT-Qx and PBDT-TPD analogs. The copolymers incorporated with benzo[1,2-b:4,5-b’]dithiophene (BDT) units show that the 1D and 2D structural variations of the side groups on the BDT unit are correlated with the device performance. As a result, the corresponding solar cells (ITO/PEDOT:PSS/polymer:PC₇₁BM/LiF/Al) based on the four copolymers feature very high open-circuit voltages (V_oc) of around 1.0 V. The copolymer PBDT-PQD1 attains the best power conversion efficiency of 4.9%, owing to its relatively high absorption intensity and suitable film morphol. The structure-property correlation demonstrates that the new PQD unit is a promising electron-deficient building block for efficient photovoltaic materials with high V_oc.

Polymer Chemistry published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C19H21N3O3S, Formula: C4Br2N2O4S.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary