Category: 52431-30-8

Li, Qing published the artcileSynthesis and characterization of thieno[3,4-b]pyrazine materials for solution-processible organic red light-emitting diodes, Product Details of C4Br2N2O4S, the publication is Chemistry Letters (2011), 40(4), 417-419, database is CAplus.

Two novel thieno[3,4-b]pyrazine-cored mols., P-DTP and TP-DTP, are synthesized and are characterized by extra large Stokes shifts of over 300 nm. The bulky polyaromatic arms enable these mols. to be solution processible and provide site-isolation on the planar emissive core. They exhibit saturated red electroluminescence in non-oped organic light-emitting diodes fabricated by spin coating.

Chemistry 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, Product Details of C4Br2N2O4S.

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

Li, Qing published the artcileNovel red-emitting thieno-[3,4-b]-pyrazine derivatives suitable for vacuum evaporation and solution method to fabricate non-doped OLEDs, Related Products of bromides-buliding-blocks, the publication is Dyes and Pigments (2012), 92(1), 674-680, database is CAplus.

Two novel red-emitting thieno-[3,4-b]-pyrazine-cored mols. with phenyls (TP) or polyphenyls (Muellen type dendron, DTP) as peripheral groups were designed and synthesized. They have large Stokes shifts over 100 nm. DTP is thermally stable with decomposition temperature up to 458°C. More importantly, it is amorphous with a remarkably high glass transition temperature of 262°C. DTP can be made into thin films either by solution method or vacuum evaporation Red OLEDs were fabricated using either spin coated or vacuum evaporated DTP film as emitting layer. The evaporated device exhibited a maximum brightness of 1753 cd m^-2 and a luminous efficiency of 0.74 cd A^-1, which are among the best data ever reported for thieno-[3,4-b]-pyrazine derivatives so far. In contrast, TP failed to produce satisfactory red emission in its evaporated OLEDs.

Dyes and Pigments 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

Li, Qing published the artcileSolution-processible Thieno-[3,4-b]-pyrazine Derivatives with Large Stokes Shifts for Non-doped Red Light-emitting Diodes, Product Details of C4Br2N2O4S, the publication is Macromolecular Rapid Communications (2011), 32(9-10), 736-743, database is CAplus and MEDLINE.

A group of novel thieno-[3,4-b]-pyrazine-cored mols. containing polyphenyl dendrons with or without arylamino or carbazolyl surface groups (DTP, N-DTP and C-DTP) are synthesized and investigated. They are characterized by extra large Stokes shifts of over 250 nm. In addition, to provide the site-isolation effect on the planar emissive core, the bulky dendrons enable these mols. to be solution processible. The peripheral carbazolyl or arylamino units facilitate the hole transporting ability in the neat films of these mols. These dendritic materials are used as a non-doped emitting layer to fabricate organic light-emitting diodes (OLEDs) using a spin coating technique and saturated red emission is obtained. The dendritic mols. with arylamino or carbazolyl surface groups (N-DTP and C-DTP) exhibit a brightness of 1020 cd m^-2 and a luminous efficiency of 0.6 cd A^-1, both higher than the dendritic analog without the surface functional groups (DTP), even superior to the small mol. reference compound which fails to transmit pure red emission under identical conditions. This performance is also comparable with that from vacuum deposited thieno-[3,4-b]-pyrazine-based counterparts and that for some other solution processible red fluorescent dendrimers. This is the first example of solution processible thieno-[3,4-b]-pyrazine derivatives for OLED applications.

Macromolecular Rapid Communications 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, Product Details of C4Br2N2O4S.

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

Zoombelt, Arjan P. published the artcileThe influence of side chains on solubility and photovoltaic performance of dithiophene-thienopyrazine small band gap copolymers, Category: bromides-buliding-blocks, the publication is Polymer (2009), 50(19), 4564-4570, database is CAplus.

Three small band gap copolymers based on alternating dithiophene and thienopyrazine units were synthesized via Yamamoto coupling and applied in bulk heterojunction solar cells as donor together with PCBM ([6,6]-Ph C₆₁ butyric acid Me ester) as acceptor. The polymers have an optical band gap of ∼1.3 eV in the solid state and only vary by the chem. nature of the solubilizing side chains. The nature of the side chain has a major effect on solubility and processability of the polymer. Using n-butoxymethyl side chains a soluble, easy to process polymer was obtained that gave the best photovoltaic performance. With short-circuit currents up to 5.2 mA/cm² an efficiency of 0.8% was achieved under estimated standard solar light conditions (air-mass 1.5G, 100 mW/cm²) with spectral response up to 950 nm.

Polymer 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 C37H30ClIrOP2, Category: bromides-buliding-blocks.

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

Moon, Yejin published the artcileLight-Insensitive Organic Field-Effect Transistors with n-Type Conjugated Polymers Containing Dinitrothiophene Units, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Advanced Electronic Materials (2018), 4(11), n/a, database is CAplus.

Here, it is reported that organic field-effect transistors (OFETs) with n-type conjugated polymer, poly[{2,5-bis-(2-octhyldodecyl)-3,6-bis-(thien-2-yl)-pyrrolo[3,4-c]pyrrole-1,4-diyl}-co-{2,2′-(3,4-dinitrothiophene)]-5,5′-diyl}] (PODTPPD-DNT), can be operated without large disturbance by surrounding light. The PODTPPD-DNT polymer synthesized via the Stille coupling reaction could act as a channel layer for n-channel OFETs. Although the PODTPPD-DNT polymer shows a broad optical absorption from UV to near-IR parts up to 1000 nm, the OFETs with the PODTPPD-DNT channel layers do not almost respond to monochromatic (520 and 780 nm) and white light. The reason is assigned to the exciton quenching effect by two nitro groups in the polymer chain. The semitransparent OFETs with the 20 nm thick PODTPPD-DNT channel layers are also almost light-insensitive for operation under typical room light conditions.

Advanced Electronic 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, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

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

Jeong, Jaemyeng published the artcileSynthesis and characterization of triphenylamine-based polymers and their application towards solid-state electrochromic cells, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is RSC Advances (2016), 6(82), 78984-78993, database is CAplus.

Four novel triphenylamine-based polymers, PJK1, PJK2, PJK3 and PJK4 were successfully synthesized and fully characterized by ¹H NMR, UV-VIS spectroscopy, cyclic voltammetry (CV), GPC and spectroelectrochem. These polymers are easily soluble in many common organic solvents, which make them appropriate for film deposition via spray-coating. We fabricated electrochromic cells comprising ITO-coated glass/polymer/gel electrolyte/ITO-coated glass and patterned the color change by applying d.c. with different voltages. We report herein color changes, from the neutral to oxidized form as follows: for PJK1, orange to dark green; for PJK2, light yellow to reddish brown; for PJK3, light blue to gray; and for PJK4, green to bluish green. The majority of the copolymers exhibited very good thermal stabilities, as evidenced by less than a 5% weight loss in temperatures exceeding 400°C. To further characterize, we simulated the electrochem. and optical properties, which are good agreement with the exptl. data.

RSC Advances 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

Ju, Xiuping published the artcileSynthesis and electrochemical capacitive performance of thieno[3,4-b]pyrazine-based Donor-Acceptor type copolymers used as supercapacitor electrode material, Synthetic Route of 52431-30-8, the publication is Electrochimica Acta (2017), 36-48, database is CAplus.

Two novel donor-acceptor-donor type monomers were synthesized by using thieno[3,4-b]pyrazine (TPZ) as the acceptor units (A) and 3-methylthiophene or 3-methoxythiophene as the donor units (D). The as-prepared D-A-D monomers were named as MOTP and MTP, resp. These two monomers could be facilely polymerized on the glass carbon electrode (GCE) via a potentiostatic method, and the resultant D-A-D alternative conjugated polymers were referred as PMOTP and PMTP. The obtained conjugated polymers were routinely characterized by FT-IR, SEM and TGA at first. Then, as supercapacitor electrode materials, they were further investigated in detail by cyclic voltammetry (CV), constant galvanostatic charge-discharge (GCD) and electrochem. impedance spectroscopy (EIS) methods The GCD results showed that the polymer-modified GCEs had high specific capacitances of 678.2 and 319.1 F/g, for PMOTP and PMTP, resp., at a c.d. of 1 A/g. Excellent switching stabilities were also observed for both polymer-modified GCEs, with the high retention rates of 77.3% and 53.4% for PMOTP and PMTP, resp., after 1000 times of charge-discharge cycling at a c.d. of 10 A/g. Notably, the maximum energy densities of 22.4 Wh/kg and 7.94 Wh/kg were attained at the power d. of 0.55 kW/kg for the sym. supercapacitor based on PMOTP and PMTP, resp. The excellent performances of these two D-A-D type conjugated polymers make them to be the promising electrode materials for energy-storage and conversion applications.

Electrochimica Acta 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, Synthetic Route of 52431-30-8.

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

Zhang, Yan published the artcileThree novel donor-acceptor type electrochromic polymers containing 2,3-bis(5-methylfuran-2-yl)thieno[3,4-b]pyrazine acceptor and different thiophene donors: Low-band-gap, neutral green-colored, fast-switching materials, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Journal of Electroanalytical Chemistry (2018), 7-19, database is CAplus.

Three novel donor-accept type electrochromic polymers with very low band gap, PMFTTP, PMFBTTP and PMFMOTTP, were prepared via electrochem. polymerization, employing 2,3-bis(5-methylfuran-2-yl)thieno[3,4-b]pyrazine as the acceptor units and thiophene, butylthiophen and methoxythiophene as the donor units, resp. All the polymers were comparatively studied by cyclic voltammetry (CV), scanning electron micrographs (SEM), UV-visible-NIR spectroscopy and colorimetry. PMFTTP and PMFBTTP showed obvious color change from green color to brown in the oxidation process, while PMFMOTTP exhibited color change from brick red to dark gray. And the three polymers possessed very low optical band gaps in the following order: PMFTTP (1.23 eV) > PMFBTTP (0.88 eV) > PMFMOTTP (0.74 eV), which demonstrated the different election-donating ability of thiophene or its derivatives The electrochromic kinetic studies manifested that the polymers presented satisfactory optical contrasts (ΔT%) in the near IR region (NIR), which were 35%, 67% and 60% for PMFTTP, PMFBTTP and PMFMOTTP, resp. Also, the polymers also displayed short switching times (<1 s at any wavelengths), high coloration efficiencies (around ∼200 cm²/C) and outstanding robust stabilities, suggesting the probability of being the promising candidates for the electrochromic devices. In summary, the above pos. results, especially the neutral green color and the very low band gap, had important theor. significance for the application and development of electrochromic polymers.

Journal of Electroanalytical 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 C20H19FN2O2, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

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

Speck, J. Matthaeus published the artcileFerrocenes Bridged by Ethylenediamino Thiophene: Varying Charge Transfer Properties in a Series of 3,4-Di-N-substituted 2,5-Diferrocenyl Thiophenes, Safety of 2,5-Dibromo-3,4-dinitrothiophene, the publication is Organometallics (2015), 34(15), 3788-3798, database is CAplus.

A series of 3,4-di-N-substituted 2,5-diferrocenyl thiophenes is reported with the aim to explore the electronic interaction between the organometallic termini over their bridging unit. The syntheses of thiophenes 1–4 were implemented on the basis of 2,5-diferrocenyl-3,4-dinitrothiophene (1), which is accessible within a Pd-promoted Suzuki-Miyaura C,C cross-coupling reaction. Reduction of the nitro functionalities and a subsequent methylation or condensation reaction gives 2,5-diferrocenyl-3,4-bis(N,N-dimethylamino)-thiophene (2) or 5,7-diferrocenylthieno[3,4-b]pyrazine (3). Finally, 5,7-diferrocenyl-1,4-dimethyl-1,2,3,4-tetrahydrothieno[3,4-b]pyrazine (4) could be synthesized through conversion of 3 in a two-step reduction/methylation reaction. The spectroscopic characterization of 1–4 was complemented by the investigation of their structural properties in the solid state. The latter disclose no significant influence of the electronically different N substituents on the thiophene bond distances and angles in the solid state. UV-vis solvatochromic studies on thiophenes 1 and 3 in 40 different solvents offer a moderate pos. solvatochromic shift of the MLCT absorption of 1; however, for pyrazine 3 a slight neg. solvatochromism of the appropriate absorption band was observed The electrochem. studies on thiophenes 1–4 reveal an increasing thermodn. stability of the mixed-valent species (K_C) in the order 1 < 2 ≈ 3 < 4. In situ UV-vis-NIR spectroelectrochem. examinations verify these observations. Thus, the NIR absorptions of the corresponding mixed-valent species become more intense and less solvatochromic as the electron-donating effect and the extent of the electronic π system of the bridging unit increase. Hence, the electronic coupling between the iron-based redox centers over the thiophene-based core increases in the order 1 < 2 ≈ 3 < 4.

Organometallics 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 C11H21BF4N2O2, Safety of 2,5-Dibromo-3,4-dinitrothiophene.

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

Galli, Diana published the artcileSuppressing the Surface Recombination and Tuning the Open-Circuit Voltage of Polymer/Fullerene Solar Cells by Implementing an Aggregative Ternary Compound, Safety of 2,5-Dibromo-3,4-dinitrothiophene, the publication is ACS Applied Materials & Interfaces (2018), 10(34), 28803-28811, database is CAplus and MEDLINE.

The authors present a novel small mol. based on dithienylthienothiadiazole units (named SM1) acting as an efficient component in ternary blend organic solar cells to modify the hole extraction at the interface. The SM1 suppresses the surface recombination and enhances the open-circuit voltage (V_oc). By introducing SM1 in a host system composed of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C₆₁-butyric acid Me ester (PCBM), the authors obtained V_oc values of up to 0.75 V and fill factors larger than 70% for the ternary blends. As a consequence, the power conversion efficiency is improved by ∼30% compared to P3HT:PCBM binary devices. External quantum efficiency and absorption spectra in the near-IR region do not show any contribution of SM1 in dried films. Instead, the addition of the small mol. improves the V_oc by reducing the surface recombination losses. To shed light on the recombination processes, the authors carried out Fourier-transform photocurrent spectroscopy and impedance spectroscopy measurements. The ternary concept can also have functionalities other than photosensitization and can even act as a morphol.-directing agent or an interface modifier.

ACS Applied Materials & Interfaces 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, Safety of 2,5-Dibromo-3,4-dinitrothiophene.

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