Category: 52431-30-8

Cheminet, Nathalie published the artcileElaboration of low-band-gap π-conjugated systems based on thieno[3,4-b]pyrazines, Formula: C4Br2N2O4S, the publication is Pure and Applied Chemistry (2020), 92(2), 335-353, database is CAplus.

In order to understand the electronic contribution of the thienopyrazine building block on the electronic properties of π-conjugated systems, small mols. containing thiophene and thienopyrazine moieties are synthesized and jointly studied by theor. (DFT) and exptl. methods (UV-Vis, UPS). Taking advantages of these preliminar attractive results, four low band gap extended structures have been elaborated on the base of Donor-Acceptor-Donor sequences (DAD); these elongated π-conjugated mols. exhibit noticeable electronic and absorption properties spreading from the near UV to NIR regions.

Pure and Applied 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 C4Br2N2O4S, Formula: C4Br2N2O4S.

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

Qi, Ji published the artcilePanchromatic small molecules for UV-Vis-NIR photodetectors with high detectivity, HPLC of Formula: 52431-30-8, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2014), 2(13), 2431-2438, database is CAplus.

Two donor-acceptor-donor (D-A-D) type low-bandgap small mols., M1 and M2, with bis(2-thienyl)-N-alkylpyrrole (TPT) as the donor and thieno[3,4-b]thiadiazole (TT) as the acceptor were designed and synthesized. The absorption, transmission, electrochem., thermal and film properties were studied. The compounds showed panchromatic absorption in the spectral range of 300-1000 nm. They exhibited semi-transparent property in the visible region (400-700 nm). Small mol. photodetectors (SMPDs) based on M1 and M2 were fabricated and studied. For the SMPD with BCP as the hole blocking layer (HBL), a detectivity of 5.0 × 10¹¹ Jones at 800 nm at -0.1 V was obtained, which is among the highest detectivities reported for NIR SMPDs. With a sufficiently thin Ag electrode, visibly transparent PDs with an average transmittance of 45% in the visible region were obtained for the 1st time. The transparent PDs exhibited fairly constant and high detectivity of (1-10) × 10¹¹ Jones over λ = 300-900 nm. Side chains of the compounds exhibited a great influence on the device performance, which could be assigned to their film absorption coefficient, mol. packing and active layer morphol.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices 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

Kono, Takahiro published the artcileSynthesis and photo-electrochemical properties of novel thienopyrazine and quinoxaline derivatives, and their dye-sensitized solar cell performance, Quality Control of 52431-30-8, the publication is Organic Electronics (2012), 13(12), 3097-3101, database is CAplus.

Light absorption from visible to NIR region is required to increase the photocurrent and to enhance the photo-energy conversion efficiencies in dye-sensitized solar cells (DSSCs). We have now developed novel thienopyrazine dye TP1 which has absorption up to 700 nm. Quinoxaline dye QX2 with absorption at shorter wavelengths than TP1 has been synthesized for comparisons. The power conversion efficiencies of DSSCs with TP1 and QX2 showed 4.4% and 3.2%, resp. The absorption edge in IPCE of TP1 reached 800 nm and the open circuit voltage (Voc) of QX2 was high (0.77 V). To improve the device performances, QX2 was used as a co-adsorbent dye with TP1. In the mixed sensitizer based DSSC, a high power conversion efficiency of 6.2% was achieved due to the effective light harvesting and steric effect of QX2.

Organic Electronics 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

Steinberger, Simon published the artcileSynthesis and characterizations of red/near-IR absorbing A-D-A-D-A-type oligothiophenes containing thienothiadiazole and thienopyrazine central units, Synthetic Route of 52431-30-8, the publication is Journal of Materials Chemistry (2012), 22(6), 2701-2712, database is CAplus.

A series of π-conjugated A-D-A-D-A-type oligothiophenes comprising heterocyclic thieno[3,4-c][1,2,5]thiadiazole or thieno[3,4-b]pyrazine as the core and dicyanovinyl or trifluoroacetyl as terminal acceptor groups have been developed as red/near-IR absorbers. The resulting oligomers were characterized by UV-visible spectroscopy, cyclic voltammetry and thermal anal. The low energy absorption band of these oligomers was located at 620-707 nm in solution and at 695-830 nm in thin films. Theor. studies reveal that the insertion of the bicyclic nonclassical thiophenes to the conjugated backbone imposed partial quinoidal character to the resulting oligomers and thus reduced the band gap. HOMO-LUMO energies of the oligothiophenes derived from electrochem. measurements were found to be suitable for the use as donor material in combination with fullerene-C₆₀ as acceptor in planar heterojunction solar cells prepared by vacuum deposition. Such devices incorporating these low band gap oligomers exhibited high fill factor values up to 0.60, and power conversion efficiencies of up to 1.3% under air-mass 1.5G illumination. External quantum efficiency spectra clearly showed the contribution of the low energy absorption to the overall photocurrent.

Journal of Materials 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 C7H5Br2F, Synthetic Route of 52431-30-8.

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

Sharma, G. D. published the artcileDithienylthienothiadiazole-based organic dye containing two cyanoacrylic acid anchoring units for dye-sensitized solar cells, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is RSC Advances (2012), 2(30), 11457-11464, database is CAplus.

A new dithienylthienothiadiazole-based organic dye (D) was synthesized by a seven-step synthetic route for use as a sensitizer in dye sensitized solar cells (DSSCs). The dye contains a dithienylthienothiadiazole central unit and two cyanoacrylic acid anchoring side groups. Optical and electrochem. properties of D were evaluated. In addition, d. functional theory (DFT) and time dependent d. functional theory (TD-DFT) calculations were carried out. A favorable electronic excitation from the HOMO (HOMO) to the LUMO (LUMO) indicated that the dye can be used as a sensitizer for DSSC applications. The photovoltaic properties of laboratory scale optimized DSSCs sensitized with D showed a power conversion efficiency (PCE) of 4.22%, which was further improved to 5.47% upon the addition of chenodeoxylic acid (CDCA) as a coadsorbant.

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 C2H8Cl2N4S2, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

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

Dong, Changshuai published the artcileAn n-type narrow-bandgap organoboron polymer with quinoidal character synthesized by direct arylation polymerization, COA of Formula: C4Br2N2O4S, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2022), 10(7), 2718-2723, database is CAplus.

Narrow bandgap conjugated polymers have received great attention due to their wide applications in optoelectronic devices. Because of the synthetic difficulty, it is greatly challenging to develop n-type conjugated polymers with a narrow bandgap with quinoidal character. Herein, we report an n-type narrow-bandgap organoboron polymer with quinoidal character, PBN-TP. PBN-TP is designed with alternating units of BNBP (double B ← N bridged bipyridine) and quinoidal TP (thieno[3,4-b]pyrazine). Direct arylation polymerization of the di-bromo BNBP unit and the di-hydro TP unit affords the organoboron polymer with a high number-average mol. weight of 28.3 kDa. Compared with the control polymer with alternating units of BNBP and thiophene, PBN-T, the replacement of the thiophene unit with a quinoidal TP unit reduces the bond length alternation (BLA) of carbon-carbon bonds and planarized the polymer backbone of PBN-TP, leading to an enhanced contribution of the polymer quinoidal resonance structure. As a result, compared with PBN-T, PBN-TP shows a much reduced bandgap of 1.50 eV, which is among the lowest reported for n-type organoboron polymers based on BNBP. Moreover, due to the low LUMO energy level, PBN-TP could be readily n-doped and used as an n-type polymer thermoelec. material. This work provides a new n-type narrow bandgap conjugated polymer with quinoidal character.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices 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

Peng, Kai published the artcileNovel synthesis of poly(3,4-dinitro-thiophen-2-yl arylamine) derivatives via facile C-Br/N-H bulk polycondensation and its application of thermalsensor, Product Details of C4Br2N2O4S, the publication is Polymer (2020), 122550, database is CAplus.

C-Br/N-H bulk polycondensation is firstly proposed and corresponding poly(3,4-dinitro-thiophen-2-yl arylamine)s derivatives have been successfully obtained with quant. yield. Typical crystal anal. reveals that its effective reaction points distance (RPD, distance between Br and H atom) is 5.083 Å, which is 66.7% longer than the sum of van der Waals radius (r_w) of bromine and hydrogen atoms (3.05 Å). Carbazole-based monomer was explored as a thermalsensor with excellent relative sensitivity (S_a) of 0.45% K^-1.

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 C4Br2N2O4S, Product Details of C4Br2N2O4S.

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

Chen, Yi-Sheng published the artcileNew Exciplex-Forming Co-Host System and Thienothiadazole-based Fluorescent Emitter for High-Efficiency and Promising Stability Near-Infrared OLED, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Advanced Optical Materials (2022), 10(4), 2101952, database is CAplus.

Two new spirobifluorene (SF)-centered donors (D) DPSF and DTSF are developed to blend with acceptor (A) CN-T2T for exciplex formation. The transient photoluminescence characterizations of pristine donor and D:A blended films verify the donor aggregates emissions that lead to relatively low photoluminescence quantum yield (PLQY) of exciplex emission. However, the charge recombination at lower energy exciplex state leads the device with DPSF:CN-T2T blend to give electroluminescence (EL) λ_max of 584 nm and external quantum efficiency (EQE) of 6.0%. The DPSF:CN-T2T exciplex excitons are efficiently extracted by a D-A-D-type fluorescence emitter TTDSF comprising thienothiadiazole core and SF peripherals via Forster energy transfer to give near-IR (NIR) emission (760 nm, PLQY 26%). After the electron-transporting layer thickness optimization, the device with DPSF:CN-T2T: 7 weight% TTDSF as emitting layer affords EL λmax 774 nm and EQE up to 5.3%, one of the best cases in NIR organic light-emitting diodes (OLEDs). More importantly, the device stability has been examined to display an excellent lifetime (LT95 > 200 h). This work manifests the judicious combination of an exciplex-forming co-host system and a designated NIR emitter equipping with a high quinoidal core and rigid peripheral SF groups that can realize an efficient NIR OLED.

Advanced Optical 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

Chen, Yi-Sheng published the artcileNew Exciplex-Forming Co-Host System and Thienothiadazole-based Fluorescent Emitter for High-Efficiency and Promising Stability Near-Infrared OLED, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Advanced Optical Materials (2022), 10(4), 2101952, database is CAplus.

Two new spirobifluorene (SF)-centered donors (D) DPSF and DTSF are developed to blend with acceptor (A) CN-T2T for exciplex formation. The transient photoluminescence characterizations of pristine donor and D:A blended films verify the donor aggregates emissions that lead to relatively low photoluminescence quantum yield (PLQY) of exciplex emission. However, the charge recombination at lower energy exciplex state leads the device with DPSF:CN-T2T blend to give electroluminescence (EL) λ_max of 584 nm and external quantum efficiency (EQE) of 6.0%. The DPSF:CN-T2T exciplex excitons are efficiently extracted by a D-A-D-type fluorescence emitter TTDSF comprising thienothiadiazole core and SF peripherals via Forster energy transfer to give near-IR (NIR) emission (760 nm, PLQY 26%). After the electron-transporting layer thickness optimization, the device with DPSF:CN-T2T: 7 weight% TTDSF as emitting layer affords EL λmax 774 nm and EQE up to 5.3%, one of the best cases in NIR organic light-emitting diodes (OLEDs). More importantly, the device stability has been examined to display an excellent lifetime (LT95 > 200 h). This work manifests the judicious combination of an exciplex-forming co-host system and a designated NIR emitter equipping with a high quinoidal core and rigid peripheral SF groups that can realize an efficient NIR OLED.

Advanced Optical 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

Peng, Kai published the artcileNovel synthesis of poly(3,4-dinitro-thiophen-2-yl arylamine) derivatives via facile C-Br/N-H bulk polycondensation and its application of thermalsensor, Product Details of C4Br2N2O4S, the publication is Polymer (2020), 122550, database is CAplus.

C-Br/N-H bulk polycondensation is firstly proposed and corresponding poly(3,4-dinitro-thiophen-2-yl arylamine)s derivatives have been successfully obtained with quant. yield. Typical crystal anal. reveals that its effective reaction points distance (RPD, distance between Br and H atom) is 5.083 Å, which is 66.7% longer than the sum of van der Waals radius (r_w) of bromine and hydrogen atoms (3.05 Å). Carbazole-based monomer was explored as a thermalsensor with excellent relative sensitivity (S_a) of 0.45% K^-1.

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 C4Br2N2O4S, Product Details of C4Br2N2O4S.

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