Category: 52431-30-8

Kim, Hyeokjun published the artcileContribution of dark current density to the photodetecting properties of thieno[3,4-b]pyrazine-based low bandgap polymers, Related Products of bromides-buliding-blocks, the publication is Dyes and Pigments (2022), 109910, database is CAplus.

Recently, near IR (NIR) organic photodetectors (OPDs) have been extensively studied. Bulk heterojunction NIR OPDs composed of a high-bandgap polymer donor (PD) and a low-bandgap non-fullerene acceptor (NFA) showed the best performance, whereas the low-bandgap PD-based OPDs were relatively unsuccessful due to the high level of dark c.d. (J_d) under a neg. bias. In this study, we synthesized three low-bandgap PDs based on a thieno[3,4-b]pyrazine (TP) moiety and developed red-NIR OPDs by blending them with a low-bandgap NFA. We found that the PD having a shallow HOMO energy level generated the largest ground-state electron transfer at neg. bias, which overestimated the responsivity (R) and detectivity (D*) in OPDs. Notably, under weak light irradiation of 0.1 mW/cm² at -2V, the contribution of J_d on J_ph reached 99.6%. Thus, we modified the existing R and D* equations to better understand photodetecting properties at low light intensity, and these modified equations gave more realistic R and D* values in OPDs. On the other hand, a low-bandgap PD showing low J_d in OPDs was highly beneficial to detect a low light signal because the J_d negligibly contributed to J_ph in OPDs. The low J_d values of OPDs at neg. bias resulted in a high on/off signal ratio and constant R and D* values at different light intensities.

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

Lee, Junghun published the artcileDiscovery of novel 4-aryl-thieno[1,4]diazepin-2-one derivatives targeting multiple protein kinases as anticancer agents, Name: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Bioorganic & Medicinal Chemistry (2018), 26(8), 1628-1637, database is CAplus and MEDLINE.

A series of 4-aryl-thieno[1,4]diazepin-2-one were synthesized and evaluated for their antiproliferative activities against the A375P melanoma and U937 hematopoietic cell lines. Several compounds showed very potent antiproliferative activities toward both cell lines and the activities were better than that of sorafenib, the reference standard Derivatives were made as amide (8a-8i, 9a-9m) and urea (10a-10d, 11a-11d) with diverse hydrophobic moieties. One of the most potent inhibitor 10d, 1-(4-((4-ethylpiperazin-1-yl)methyl)-3-(trifluoromethyl)phenyl)-3-(4-(2-oxo-2,3-dihydro-1H-thieno [3,4-b][1,4]diazepin-4-yl)phenyl)urea was found to be very potent inhibitor of multi-protein kinases including FMS kinase (IC₅₀=3.73nM) and is a promising candidate for further development in therapeutics for cancer.

Bioorganic & Medicinal 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, Name: 2,5-Dibromo-3,4-dinitrothiophene.

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

Huber, Johannes published the artcileNanoparticles of Low Optical Band Gap Conjugated Polymers, Computed Properties of 52431-30-8, the publication is Macromolecules (Washington, DC, United States) (2012), 45(19), 7799-7805, database is CAplus.

Sonogashira coupling of 9,9-bis(2-ethylhexyl)-2,7-diethynyl-9H-fluorene (1) with 2,7-dibromo-9,9-bis(2-ethylhexyl)-9H-fluorene (2) and dibromo-substituted electron accepting arylenes 5,7-bis(5-bromothiophen-2-yl)-2,3-dihexylthieno[3,4-b]pyrazine (3), 4,7-bis(5-bromo-4-(2-ethylhexyl)thiophene-2-yl)bis(benzothiadiazole) (4) or 4,9-bis(5-bromo-4-(2-ethylhexyl)thiophen-2-yl)-6,7-dihexylthiadiazolo[3,4-g]quinoxaline (5), resp., in a miniemulsion polymerization process afforded colloidally stable dispersions of poly(arylene ethynylene) nanoparticles with an average size in the range of 50 to 120 nm. For these poly[1-alt-(2-co-X)] (X = 3, 4, or 5), poly(1-alt-3), poly(1-alt-4), and poly(1-alt-5) aqueous nanoparticle dispersions absorption occurs increasingly in the red and NIR regime with increasing incorporation of acceptor monomer, with a strong absorption up to λ_abs = 1 μm for poly(1-alt-4) dispersions. For poly[1-alt-(2-co-3)] nanoparticles fluorescence is also observed at λ_em = ca. 700 nm, which occurs at this long wavelength exclusively even at an incorporation of only 1 mol % of 3 due to energy transfer to the low-energy chromophores. An alternative postpolymn. approach by change of solvent quality yielded dilute aqueous dispersions of self-stabilized nanoparticles from an amphiphilic block copolymer, poly(ethylene glycol)-block-poly(1-alt-6)-block-poly(ethylene glycol) generated from alkyne-terminated poly(1-alt-6) via azide-alkyne coupling (6 = 4,7-bis(5-bromo-4-(2-ethylhexyl)thiophene-2-yl)benzothiadiazole), which fluoresce at λ_em max = 672 nm.

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, Computed Properties of 52431-30-8.

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

Murad, Ary R. published the artcileCharacteristics of low band gap copolymers containing anthracene-benzothiadiazole dicarboxylic imide: synthesis, optical, electrochemical, thermal and structural studies, HPLC of Formula: 52431-30-8, the publication is Polymers (Basel, Switzerland) (2021), 13(1), 62, database is CAplus and MEDLINE.

Two novel low band gap donor-acceptor (D-A) copolymers, poly[9,10-bis(4-(dodecyloxy)phenyl)-2,6-anthracene-alt-5,5-(4′,7′-bis(2-thienyl)-2′,1′,3′-benzothiadiazole-N-5,6-(3,7-dimethyloctyl)dicarboxylic imide)] (PPADTBTDI-DMO) and poly[9,10-bis(4-(dodecyloxy)phenyl)-2,6-anthracene-alt-5,5-(4′,7′-bis(2-thienyl)-2′,1′,3′-benzothiadiazole-5,6-N-octyl-dicarboxylic imide)] (PPADTBTDI-8) were synthesized in the present work by copolymerising the bis-boronate ester of 9,10-phenylsubstituted anthracene flanked by thienyl groups as electron-donor units with benzothiadiazole dicarboxylic imide (BTDI) as electron-acceptor units. Both polymers were synthesized in good yields via Suzuki polymerization Two different solubilizing alkyl chains were anchored to the BTDI units in order to investigate the impact upon their solubilities, mol. weights, optical and electrochem. properties, structural properties and thermal stability of the resulting polymers. Both polymers have comparable mol. weights and have a low optical band gap (Eg) of 1.66 eV. The polymers have low-lying HOMO (HOMO) levels of about -5.5 eV as well as the similar LUMO (LUMO) energy levels of -3.56 eV. Thermogravimetric analyses (TGA) of PPADTBTDI-DMO and PPADTBTDI-8 did not prove instability with decomposition temperatures at 354 and 313°C, resp. Powder X-ray diffraction (XRD) studies have shown that both polymers have an amorphous nature in the solid state, which could be used as electrolytes in optoelectronic devices.

Polymers (Basel, Switzerland) 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

Murad, Ary R. published the artcileFabrication of alternating copolymers based on cyclopentadithiophene-benzothiadiazole dicarboxylic imide with reduced optical band gap: synthesis, optical, electrochemical, thermal, and structural properties, Category: bromides-buliding-blocks, the publication is Polymers (Basel, Switzerland) (2021), 13(1), 63, database is CAplus and MEDLINE.

A series of alternating copolymers containing cyclopentadithiophene (CPDT) flanked by thienyl moieties as electron-donor units and benzothiadiazole dicarboxylic imide (BTDI) as electron-acceptor units were designed and synthesized for solar cell applications. Different solubilizing side chains, including 2-ethylhexyl chains and n-octyl chains were attached to CPDT units, whereas 3,7-dimethyloctyl chains and n-octyl chains were anchored to the BTDI moieties. The impact of these substituents on the solubilities, mol. weights, optical and electrochem. properties, and thermal and structural properties of the resulting polymers was investigated. PCPDTDTBTDI-EH, DMO was synthesized via Suzuki polymerization, whereas PCPDTDTBTDI-8, DMO, and PCPDTDTBTDI-EH, 8 were prepared through direct arylation polymerization PCPDTDTBTDI-8, DMO has the highest number average mol. weight (M_n = 17,400 g mol-1) among all polymers prepared The PCPDTDTBTDI-8, DMO and PCPDTDTBTDI-8, 8 which have n-octyl substituents on their CPDT units have comparable optical band gaps (E_g ∼ 1.3 eV), which are around 0.1 eV lower than PCPDTDTBTDI-EH, DMO analogs that have 2-ethylhexyl substituents on their CPDT units. The polymers have their HOMO levels between -5.10 and -5.22 eV with PCPDTDTBTDI-EH, DMO having the deepest HOMO (HOMO) energy level. The LUMO (LUMO) levels of the polymers are between -3.4 and -3.5 eV. All polymers exhibit good thermal stability with decomposition temperatures surpassing 350 °C. Powder X-ray diffraction (XRD) studies have shown that all polymers have the amorphous nature in solid state.

Polymers (Basel, Switzerland) 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, Category: bromides-buliding-blocks.

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

Murad, Ary R. published the artcileInfluence of fluorine substitution on the optical, thermal, electrochemical and structural properties of carbazole-benzothiadiazole dicarboxylic imide alternate copolymers, Name: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Polymers (Basel, Switzerland) (2020), 12(12), 2910, database is CAplus and MEDLINE.

In this work four novel donor-acceptor copolymers, PCDTBTDI-DMO, PCDTBTDI-8, P2F-CDTBTDI-DMO and P2F-CDTBTDI-8, were designed and synthesized via Suzuki polymerization The first two copolymers consist of 2,7-carbazole flanked by thienyl moieties as the electron donor unit and benzothiadiazole dicarboxylic imide (BTDI) as electron acceptor units. In the structures of P2F-CDTBTDI-DMO and P2F-CDTBTDI-8 copolymers, two fluorine atoms were incorporated at 3,6-positions of 2,7-carbazole to investigate the impact of fluorine upon the optoelectronic, structural and thermal properties of the resulting polymers. P2F-CDTBTDI-8 possesses the highest number average mol. weight (Mn = 24,200 g mol-1) among all the polymers synthesized. PCDTBTDI-DMO and PCDTBTDI-8 show identical optical band gaps of 1.76 eV. However, the optical band gaps of fluorinated copolymers are slightly higher than non-fluorinated counterparts. All polymers have deep-lying HOMO (HOMO) levels. Changing the alkyl chain substituents on BTDI moieties from linear n-octyl to branched 3,7-dimethyloctyl groups as well as substituting the two hydrogen atoms at 3,6-positions of carbazole unit by fluorine atoms has negligible impact on the HOMO levels of the polymers. Similarly, the LUMO (LUMO) energy levels are almost comparable for all polymers. Thermogravimetric anal. (TGA) has shown that all polymers have good thermal stability and also confirmed that the fluorinated copolymers have higher thermal stability relative to those non-fluorinated analogs. Powder X-ray diffraction (XRD) studies proved that all polymers have an amorphous nature in the solid state.

Polymers (Basel, Switzerland) 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, Name: 2,5-Dibromo-3,4-dinitrothiophene.

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

Alghamdi, Abdulaziz Ali B. published the artcileSynthesis and characterization of novel thiophene and carbazole-based polymers – optical and electrochemical characterization, Computed Properties of 52431-30-8, the publication is International Journal of Electrochemical Science (2016), 11(6), 5111-5127, database is CAplus.

A donor/acceptor series of carbazole copolymers, composed of alternating 2,7-linked 3,6-difluoro-9-(1-octyl-nonyl)-carbazole units and bithiophene repeated units [P1], 5,7-bis(5-bromothiophen-2-yl)-2,3-bis(4-(2-ethylhexyloxy) phenyl) thieno[3,4-b]pyrazine repeated units [P2] and bithiophene mixed with 5,7-bis(5-bromothiophen-2-yl)-2,3-bis(4-(2-ethylhexyloxy) phenyl) thieno[3,4-b]pyrazine repeated units [P3] have been prepared following Suzuki polymerization procedures. The route of synthesis and characterization techniques of this novel class of materials, together with their photophys. and electrochem. properties are presented in this study. The polymers were characterized by 1H NMR, 13C NMR and Elemental Anal. Mol. weights were estimated using gel permeation chromatog. (GPC). The thermal stability behavior for polymers was investigated using thermogravimetric anal. (TGA) and differential scanning calorimetry (DSC). The electronic and photo-phys. properties were investigated by use of cyclic voltammetry (CV) and UV-Vis spectroscopy, resp.

International Journal of Electrochemical Science 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, Computed Properties of 52431-30-8.

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

Chen, Chiu-Hsiang published the artcileSynthesis and Characterization of Bridged Bithiophene-Based Conjugated Polymers for Photovoltaic Applications: Acceptor Strength and Ternary Blends, Application In Synthesis of 52431-30-8, the publication is Macromolecules (Washington, DC, United States) (2010), 43(2), 697-708, database is CAplus.

Six of three-component donor-acceptor random copolymers P1-P6, symbolized as (thiophene donor)_m-(thiophene acceptor)_n, were rationally designed and successfully synthesized by the palladium-catalyzed Stille coupling. The 4H-cyclopenta[2,1-b:3,4-b’]dithiophene (CPDT) unit serves as the donor for P1-P4, while the benzothiadiazole (BT), quinoxaline (QU), dithienoquinoxaline, and thienopyrazine (TP) units are used as the acceptor for P1, P2, P3, and P4, resp. P5 and P6 are structurally analogous to P1 and P2 except for using the dithieno[3,2-b:2′,3′-d]silole (DTS) unit as the donor. Because the band gap lowering ability of the acceptor units in the polymer is in the order TP > BT > QU presumably due to the quinoid form population in the polymers, the optical band gaps can be well adjusted to be 1.2, 1.6, and 1.8 eV for P4, P1, and P2, resp. It is found that the two bridged bithiophene units, CPDT and DTS, have similar steric and electronic effects on the P1 and P5 as well as P2 and P6, resp., leading to comparable intrinsic properties and device performances. Bulk heterojunction photovoltaic cells based on ITO/PEDOT:PSS/polymer:PC₇₁BM/Ca/Al configuration were fabricated and characterized. Although P4 exhibits the lowest optical band gap, broadest absorption spectrum, and highest mobility, the too low-lying LUMO level hinders the efficient exciton dissociation, resulting in a low PCE of 0.7%. Compared with poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b’]dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT), random copolymer P1 shows more blue-shifted, broader absorption spectrum, comparable mobility, and a higher PCE of 2.0%. In view of the fact that P1 shows a higher band gap with strong absorption in visible region, while PCPDTBT has a lower band gap to mainly absorb NIR light, a BHJ device with the active layer containing ternary blend of PCPDTBT/P1/PC₇₁BM was investigated and achieved an enhanced PCE of 2.5%, which outperforms the devices based on the binary blending systems of PCPDTBT/PC₇₁BM (PCE = 1.4%) or P1/PC₇₁BM (PCE = 2.0%) under the identical conditions. Such an improvement is ascribed to the complementary absorption and compatible structure of P1 and PCPDTBT polymers.

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, Application In Synthesis of 52431-30-8.

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

Gao, Juan published the artcileSynthesis, characterization and photovoltaic properties of conjugated copolymers based on 2-alkyl-thieno[3,4-b]imidazole, Formula: C4Br2N2O4S, the publication is Synthetic Metals (2012), 162(17-18), 1694-1700, database is CAplus.

A new acceptor unit, 2-alkyl-thieno[3,4-b]imidazole, was synthesized through an annulation reaction between a 3,4-diaminothiophene derivative and a carboxyl acid or an acyl chloride, and was used for developing donor-acceptor conjugated copolymers. Copolymerization of 2-alkyl-thieno[3,4-b]imidazole and benzo[1,2-b:3,4-b’]dithiophene (BDT) or dithieno[3,2-b:2′,3′-d]silole (DTS) afforded 6 new low bandgap polymers P1-P6. These polymers possess intensive absorption at 400-650 nm and the optical bandgaps are in the range of 1.69-1.88 eV. They were firstly applied in polymer solar cells and the best efficiency of 0.72% was obtained from P2/PC₇₁BM cells fabricated using a dip-coating method.

Synthetic Metals 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

Lepeltier, Marc published the artcileNew azaborine-thiophene heteroacenes, Quality Control of 52431-30-8, the publication is Chemical Communications (Cambridge, United Kingdom) (2010), 46(37), 7007-7009, database is CAplus and MEDLINE.

A new class of heteroacenes containing B, N and S elements in the 22-electron aromatic nucleus was synthesized by reaction of diaminoterthiophenes with dichlorophenylborane. Their structure was studied by x-ray crystallog. and DFT calculations UV-visible absorption /emission spectroscopy shows high rigidity and deep-blue fluorescence of these compounds

Chemical Communications (Cambridge, United Kingdom) 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