Tag: M.W=300-350

Shen, Xingxing published the artcileSynthesis of thienoselenadiazole-containing conjugated copolymers and their application in polymer solar cells, SDS of cas: 52431-30-8, the publication is Polymer Journal (Tokyo, Japan) (2012), 44(9), 978-981, database is CAplus.

We have successfully synthesized the thienoselenadiazole unit through the condensation reaction between thiophene diamine and SeO₂ and applied the thienoselenadiazole unit for D-A-conjugated polymers. The thienoselenadiazole-based polymers exhibit good solubility in common organic solvents, good thermal stability, and deep HOMO levels. The solar cells based on thienoselenadiazole-containing polymers gave high open-circuit voltage. Further improving of the light-absorption properties of the thienoselenadiazole-containing polymers to achieve high short-circuit c.d. and high power conversion efficiency is currently underway.

Polymer Journal (Tokyo, Japan) 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 C9H7NO2, SDS of cas: 52431-30-8.

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

Braunschweig, Holger published the artcileSynthesis, Crystal Structure, EPR and DFT Studies, and Redox Properties of [2]Tetramethyldisilacobaltocenophane, Synthetic Route of 18346-57-1, the publication is Organometallics (2008), 27(24), 6427-6433, database is CAplus.

The 1st [2]silacobaltocenophane, [(Me₂Si)₂(η⁵-C₅H₄)₂Co] (1), was synthesized by dilithiation of 1,2-bis(cyclopentadienyl)-1,1,2,2-tetramethyldisilane with BuLi and subsequent reaction with [CoBr₂(dme)]. EPR spectroscopic studies of frozen pentane solutions of 1 at X-band showed a fully anisotropic g tensor (g₁ = 1.914, g₂ = 2.005, and g₃ = 2.084) with hyperfine couplings on all three components (A₁ = 145 MHz, A₂ = 67 MHz, and A₃ = 424 MHz). DFT studies using the B3LYP functional with its 20% exact exchange provide the best agreement with experiment and reproduce the g and A tensors well. Spin-orbit contributions to the isotropic coupling (A_PC) and to the anisotropies (A_i^dip,2) are significant. As was shown by cyclic voltammetry in THF, 1 is quasi-reversibly oxidized to the neutral cobaltocenium cation [(Me₂Si)₂(η⁵-C₅H₄)₂Co]⁺ (8) at a potential of E°_1/2 = -1.27 V (vs. the Fc/Fc⁺ couple) and quasi-reversibly reduced to the corresponding anion [(Me₂Si)₂(η⁵-C₅H₄)₂Co]^– (9) at E°_1/2 = -2.40 V. The preparative oxidation of 1 with 1 equiv of ferrocenium hexafluorophosphate ([Fc][PF₆]) provided the diamagnetic [PF₆]^– salt of the cation 8 in high yields. The mol. structures of both complexes (1 and 8) were confirmed by x-ray diffraction anal., and a significant decrease in mol. strain was depicted. DFT findings support the experiments

Organometallics published new progress about 18346-57-1. 18346-57-1 belongs to bromides-buliding-blocks, auxiliary class Cobalt, name is Cobalt(II) dibromo(1,2-dimethoxyethane), and the molecular formula is C4H10Br2CoO2, Synthetic Route of 18346-57-1.

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

Goti, Giulio published the artcileDonor-Acceptor-Donor Thienopyrazine-Based Dyes as NIR-Emitting AIEgens, Category: bromides-buliding-blocks, the publication is European Journal of Organic Chemistry (2021), 2021(18), 2655-2664, database is CAplus.

Organic Near-IR luminophores have found broad application as functional materials, but the development of efficient NIR emitters is still a challenging goal. Here we report on a new class of thieno[3,4-b]pyrazine-based NIR emitting materials with Aggregation Induced Emission (AIE) properties. The dyes feature a donor-acceptor-donor (D-A-D) structure, with a thienopyrazine acceptor core connected to two triarylamine donor groups bearing a tetraphenylethylene (TPE) moiety. Fast and efficient synthesis allowed the modular preparation of three dyes of tunable absorption and emission profiles. These constructs were extensively characterized by spectroscopic studies in different solvents, which revealed intense light-harvesting ability and emissions in the deep-red and NIR region with large Stokes shift values. Remarkably, the dyes exhibited AIE properties, retaining emissive ability in the aggregate state, thus emerging as attractive materials for their potential application in the development of luminescent devices.

European Journal of Organic 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, Category: bromides-buliding-blocks.

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

Boga, Carla published the artcileElectron reduction processes of nitrothiophenes. A systematic approach by DFT computations, cyclic voltammetry and E-ESR spectroscopy, Related Products of bromides-buliding-blocks, the publication is Organic & Biomolecular Chemistry (2012), 10(39), 7986-7995, database is CAplus and MEDLINE.

In the framework of the interest in nitrothiophenes as drugs or hits with different pharmacol. applications and considering that in several instances nitroredn. is an essential step for their biol. activity, the authors have studied a complete series of mono-, di-, and tri-nitrothiophenes and by comparison some mononitro benzo[b]thiophenes and benzo[b]furans . Their electroreduction behavior was studied by different techniques: DFT calculations, cyclic voltammetry and electrochem. ESR spectroscopy. Although, the first reduction process for all of the compounds leads to the relevant radical anions, both the computational and there are significant differences in the fate of their corresponding forthcoming reductions, for example, formation of secondary radicals (open-shell electronic structures) or dianions. The effect of the relative positions of the nitro groups during the reduction also was analyzed and rationalized.

Organic & Biomolecular 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, Related Products of bromides-buliding-blocks.

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

Karsten, Bram P. published the artcileElectronic structure of small band gap oligomers based on cyclopentadithiophenes and acceptor units, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Journal of Materials Chemistry (2009), 19(30), 5343-5350, database is CAplus.

A combined exptl. and theor. study was carried out on a series of well-defined small band gap oligomers. The cyclopentadithiophene oligomers were prepared by Suzuki coupling of thiopheneboronic esters and dibromophenylquinoxaline compounds These oligomers comprise two terminal electron-rich cyclopentadithiophene units connected to six different electron deficient aromatic rings that allow tuning the optical band gap from 1.4 to 2.0 eV. The optical absorption of the ground state, triplet excited state, and radical cation was studied. The optical band gap correlates with the electrochem. oxidation and reduction potential and is further supported by quantum-chem. calculations at the d. functional theory (DFT) level. The optical absorption of the radical cations shows only little variations among the different oligomers, suggesting that the charge is mainly localized on the donor moieties. Triplet energy levels are generally low (<1.2 eV) and the singlet-triplet splitting remains significant when going to smaller band gaps.

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 C4Br2N2O4S, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

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

Mondal, Rajib published the artcileThiophene-rich fused-aromatic thienopyrazine acceptor for donor-acceptor low band-gap polymers for OTFT and polymer solar cell applications, Related Products of bromides-buliding-blocks, the publication is Journal of Materials Chemistry (2010), 20(28), 5823-5834, database is CAplus.

Thiophene enriched fused-aromatic thieno[3,4-b]pyrazine systems were designed and employed to produce low band gap polymers (E_g = 1.0-1.4 eV) when copolymerized with fluorene and cyclopentadithiophene. The copolymers are mainly investigated for organic thin film transistor and organic photovoltaic applications. Mol. packing in the thin films of these polymers was investigated using Grazing incidence X-ray Scattering. Although both fluorene and cyclopentadithiophene polymers follow similar face to face π-π stacking, the latter polymers show much smaller lamellar d-spacings due to side-chain interdigitation between the lamellae. This lead to the higher charge carrier mobilities in cyclopentadithiophene polymers (up to 0.044 cm2/V.s) compared to fluorene polymers (up to 8.1 × 10^-3 cm²/V.s). Power conversion efficiency of 1.4% was achieved using fluorene copolymer in solar cells with a fullerene derivative as an acceptor. Although the cyclopentadithiophene polymers show lower band gaps with higher absorption coefficients compared to fluorene copolymers, but the power conversion efficiencies in solar cells of these polymers are low due to their low ionization potentials.

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 C4Br2N2O4S, Related Products of bromides-buliding-blocks.

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

Woods, Eliot F. published the artcilePhotocontrolled Synthesis of n-Type Conjugated Polymers, Category: bromides-buliding-blocks, the publication is Angewandte Chemie, International Edition (2020), 59(15), 6062-6067, database is CAplus and MEDLINE.

Current approaches to synthesize π-conjugated polymers (CPs) are dominated by thermally driven, transition-metal-mediated reactions. Herein we show that electron-deficient Grignard monomers readily polymerize under visible-light irradiation at room temperature in the absence of a catalyst. The product distribution can be tuned by the wavelength of irradiation based on the absorption of the polymer. Conversion studies are consistent with an uncontrolled chain-growth process; correspondingly, chain extension produces all-conjugated n-type block copolymers. Preliminary results demonstrate that the polymerization can be expanded to donor-acceptor alternating copolymers. We anticipate that this method can serve as a platform to access new architectures of n-type CPs without the need for transition-metal catalysis.

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 C8H6ClN, Category: bromides-buliding-blocks.

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

Hailu, Hillete published the artcileVariable denticity of a multidentate terthiophene derivative towards Ni(II) and Zn(II) – structural studies, Synthetic Route of 52431-30-8, the publication is Bulletin of the Chemical Society of Ethiopia (2011), 25(2), 221-231, database is CAplus.

A multidentate ligand, 3,4-bis(2-iminomethylphenol)-2,2′:5,2″-terthiophene (L), was synthesized by the condensation of 3,4-diamino-2,2′:5,2″-terthiophene and salicylaldehyde. The ligand and Ni(II) and Zn(II) complexes were synthesized and characterized by IR, NMR, UV-visible, AAS, MS, molar conductivity and magnetic susceptibility measurements. The ligand behaves as neutral ONS-ONS bis-chelant towards Ni(II) in [Ni₂LCl₄(H₂O)₂]·4H₂O and as dibasic ONNO donor towards Zn(II) in [ZnL(NH₃)₂]. The dinuclear Ni(II) complex exhibits subnormal magnetic moment at room temperature due to metal-metal interaction through extended conjugation. The participation of the ring sulfur in bonding towards Ni(II) and the non-participation of the same towards Zn(II) are notable features. Octahedral geometries are proposed for both complexes. Cyclic voltammetric studies revealed electrochem. polymerization of the free ligand (L) but not of the Ni(II) and Zn(II) complexes.

Bulletin of the Chemical Society of Ethiopia 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, Yanbing published the artcileNear-Infrared Fluorescent Thienothiadiazole Dyes with Large Stokes Shifts and High Photostability, Formula: C4Br2N2O4S, the publication is Journal of Organic Chemistry (2017), 82(11), 5597-5606, database is CAplus and MEDLINE.

A series of near-IR (NIR) organic emissive materials were synthesized and the photophys. properties analyzed. The donor-acceptor-donor materials were designed with thienopyrazine and thienothiadiazole acceptor groups with thiophene-, furan-, and triphenylamine-based donor groups. The absorption and emission spectra were found to be widely tunable on the basis of the donor and acceptor groups selected. Computational anal. confirms these materials undergo an intramol. charge-transfer event upon photoexcitation. Large Stokes shifts of ∼150 nm were observed and rationalized by computational anal. of geometry changes in the excited state. Fluorescence studies on the dye series reveal maximum peak emission wavelengths near 900 nm and a quantum yield exceeding 16% for 4,6-bis(2-thienyl)thieno[3,4-c][1,2,5]thiadiazole. Addnl., several dyes were found to have reasonable quantum yields within this NIR region (>1%), with emission wavelengths reaching 1000 nm at the emission curve onset. Photostability studies were conducted on these materials in an ambient oxygen environment, revealing excellent stability in the presence of oxygen from all the dyes studied relative to a benchmark cyanine dye (ICG) during photoexcitation with exceptional photostability from the 4,6-bis(5′-dodecyl-[2,2′-bithiophene]-5-yl)thieno[3,4-c][1,2,5]thiadiazole derivative

Journal of Organic 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 C5H10O, Formula: C4Br2N2O4S.

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

Culver, Evan W. published the artcilePoly(thieno[3,4-b]pyrazine-alt-2,1,3-benzothiadiazole)s: A New Design Paradigm in Low Band Gap Polymers, HPLC of Formula: 52431-30-8, the publication is ACS Macro Letters (2018), 7(10), 1215-1219, database is CAplus and MEDLINE.

A new design paradigm for the production of low band gap polymers is reported, in which an ambipolar unit exhibiting both donor and acceptor properties is combined with a conventional acceptor. As initial examples of this approach, the synthesis of two alternating copolymers of thieno[3,4-b]pyrazine and 2,1,3-benzothiadiazole via direct arylation polymerization is reported to give soluble, processable materials with band gaps of 0.97 and 1.05 eV. Although direct arylation polymerization has been previously used to synthesize donor-acceptor materials with band gaps below 1.5 eV, this represents only the second material generated by this polymerization method with a band gap below 1.0 eV.

ACS Macro 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