Tag: M.W=300-350

Herberich, G. E. published the artcileDerivatives of 1,2-diborabenzene. II. (1,2-Dibora-3,5-cyclohexadiene)metal complexes. Crystal structure of (C₅Me₅)Rh(C₄H₄B₂Cl₂), Recommanded Product: Cobalt(II) dibromo(1,2-dimethoxyethane), the publication is Journal of Organometallic Chemistry (1988), 355(1-3), 473-84, database is CAplus.

The 1,2-diboratabenzene derivative Li₂[C₄H₄B₂(NMe₂)₂] reacts with various transition metal compounds to form sandwich and triple-decker complexes such as (C₆Me₆)RuL (I), (C₅Me₅)RhL (II), (μ-L)[Rh(COD)]₂ (III, COD = 1,5-cyclooctadiene), NiL₂, Fe(CO)L₂ (IV), and Co₂(CO)₄L₂ (V), where L = 1,2-bis(dimethylamino)-1,2-dibora-3,5-cyclohexadiene in all cases. Barriers to internal rotation around the B-N bond are 48(1), 56(1), and 38(1) kJ/mol for I–III, resp., while IV and V are rigid on the NMR time scale. Nucleophilic substitution reactions at B were examined for the Rh complex II. The Lewis acids BF₃·OEt₂ and BCl₃ bring about substitution to give (C₅Me₅)Rh[C₄H₄B₂F(NMe₂·BF₃)] and (C₅Me₅)Rh(C₄H₄B₂Cl₂) (II), resp. Attempted substitution with Al₂Me₆ and with AlH₃ in THF effected a novel ring contraction to produce the borole complexes (C₅Me₅)Rh(C₄H₄BR) (R = Me, H); similarly, traces of air transform VI into (C₅Me₅)Rh(C₄H₄BCl). The structure of VI, determined by x-ray diffraction confirms the η⁶-bonding mode of the diboracyclohexadiene ligand.

Journal of Organometallic Chemistry 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, Recommanded Product: Cobalt(II) dibromo(1,2-dimethoxyethane).

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

Schroer, Hans P. published the artcileBehavior of some metal halides toward dimethyl glycol ether, Name: Cobalt(II) dibromo(1,2-dimethoxyethane), the publication is Zeitschrift fuer Chemie (1967), 7(6), 238, database is CAplus.

Some metal halides (I), gave adducts with dimethyl glycol ether (II) in the absence of moisture and of air. The adducts prepared were (I, I:II molar ratio in the adduct, and color given): CoBr2, 1:1, blue; CoCl2, 1:1, blue; FeCl3, 1:1, yellow brown; FeCl2, 1:1, white; CdI2, 1:1, colorless; NiBr2, 1:2, orange; CuCl2, 1:0.5, brown; MoCl3, 1:1, red.

Zeitschrift fuer Chemie 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, Name: Cobalt(II) dibromo(1,2-dimethoxyethane).

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

Kulhanek, Jiri published the artcile3,4-Dinitrothiophene as a central unit of quadrupolar push-pull-push systems, Related Products of bromides-buliding-blocks, the publication is Chemistry of Heterocyclic Compounds (New York, NY, United States) (2017), 53(1), 46-53, database is CAplus.

A series of quadrupolar D-π-A-π-D mols. bearing methoxythiophene terminal donor and systematically enlarged/varied π-linkers, e.g., I was synthesized by employing cross-coupling and Knoevenagel reactions. 3,4-Dinitrothiophene was utilized as a central acceptor unit in quadrupolar D-π-A-π-D push-pull-push chromophores. Optical properties were studied by electronic absorption spectra. Fundamental optoelectronic properties were investigated by semiempirical PM7 calculations It was shown that by varying the p-conjugated system the longest wavelength absorption maxima could be shifted from 341 to 489 nm. The calculated HOMO-LUMO gaps were found within the range of 6.69-7.29 eV, while the second-order mol. polarizabilities could be tuned from 0.038 to 1.578 × 10-27 esu.

Chemistry of Heterocyclic Compounds (New York, NY, 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, Related Products of bromides-buliding-blocks.

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

Freese, Tyll published the artcileAnionic N-heterocyclic carbenes derived from sydnone imines such as molsidomine. Trapping reactions with selenium, palladium, and gold, SDS of cas: 52431-30-8, the publication is Tetrahedron (2017), 73(36), 5350-5357, database is CAplus.

The sydnone imines Molsidomine and 5-(benzoylimino)-3-(2-methoxyphenyl)-1,2,3-oxadiazolium-2-ide gave anionic N-heterocyclic carbenes on deprotonation at C4 which were trapped as methylated selenium adducts, gold complexes (x-ray anal.) as well as palladium complexes (x-ray anal.). The ¹³C NMR resonance frequencies of the carbene carbon atom are extremely shifted upfield and appear at δ = 142.1 ppm (Molsidomine carbene) and δ = 159.8 ppm (sydnone imine carbene). The Pd complexes were applied as catalysts in Suzuki-Miyaura and Sonogashira-Hagihara cross-coupling reactions.

Tetrahedron 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, SDS of cas: 52431-30-8.

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

Pruschinski, Lucas published the artcileSuzuki-Miyaura Cross-Couplings under Acidic Conditions, Application of 2,5-Dibromo-3,4-dinitrothiophene, the publication is Synthesis (2020), 52(6), 882-892, database is CAplus.

Suzuki-Miyaura reactions with Pd(PPh₃)₄ had carried out using lithium N-phenylsydnone-4-carboxylate as additive, which gave best yields at pH 5.7 in a mixture of acetic acid, water, and sodium carbonate. Reaction parameters such as the Pd source, the solvent, reaction time and temperature, acid, base and carboxylate have been varied and some representative examples of the Suzuki-Miyaura reaction have been examined

Synthesis 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 of 2,5-Dibromo-3,4-dinitrothiophene.

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

Tsai, Yu-Tang published the artcileFrequency-Selective Photobleaching as a Route to Chromatic Control in Supramolecular OLED Devices, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is ACS Applied Materials & Interfaces (2017), 9(41), 36045-36052, database is CAplus and MEDLINE.

Mols. that spontaneously self-organize into small electroluminescent domains of sub-μm dimensions when dissolved in THF are reported. The self-assembled spherical aggregates have an average diameter of 300 nm and exhibit efficient energy transfer from the blue to the green or red component. The aggregates can be chromatically addressed or patterned by selective bleaching of the energy-acceptor component using a laser source. This allows the fabrication of electroluminescence devices by directly photopatterning the active layer without the need of addnl. steps. Sub-μm features (700 nm) can be achieved using a collimated light source.

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 C10H7NO3, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

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

Peng, Qiang published the artcileThieno[3,4-b]pyrazine-based low bandgap photovoltaic copolymers: Turning the properties by different aza-heteroaromatic donors, Category: bromides-buliding-blocks, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2011), 49(20), 4458-4467, database is CAplus.

A new series of low-bandgap copolymers based on electron-accepting thieno[3,4-b]pyrazine (TPZ) and different electron-donating aza-heteroaromatic units, such as carbazole (CZ), dithieno[3,2-b:2′,3′-d]pyrrole (TPR) and dithieno[3,2-b:2′,3′-e]pyridine (TPY), have been synthesized by Suzuki or Stille coupling polymerization The resulting copolymers were characterized by NMR, elemental anal., gel permeation chromatog., thermogravimetric anal., and differential scanning calorimetry. UV-vis absorption and cyclic voltammetry measurements show that TPZ-based copolymer with TPR has the best absorption due to the strongest intramol. charge transfer effect and smallest bandgap. The basic electronic structure of D-A model compounds of these copolymers were also studied by d. functional theory (DFT) calculations The conclusion of calculation agreed also well with the exptl. results. The polymer solar cells (PSCs) based on these copolymers were fabricated with a typical structure of ITO/PEDOT:PSS/copolymer:PC₇₁BM/Ca/Al under the illumination of AM 1.5G, 100 mW cm^-2. The performance results showed that TPZ-based copolymer with TPR donor segments showed highest efficiency of 1.55% due to enhanced short-circuit c.d. The present results indicate that good electronic, optical, and photovoltaic properties of TPZ-based copolymers can be achieved by just fine-tuning the structures of aza-heteroaromatic donor segments for their application in PSCs. © 2011 Wiley Periodicals, Inc., J Polym Sci Part A: Polym Chem, 2011.

Journal of Polymer Science, Part A: 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 C4Br2N2O4S, Category: bromides-buliding-blocks.

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

McNamara, Louis E. published the artcileDonor-Acceptor-Donor Thienopyrazines via Pd-Catalyzed C-H Activation as NIR Fluorescent Materials, COA of Formula: C4Br2N2O4S, the publication is Journal of Organic Chemistry (2016), 81(1), 32-42, database is CAplus and MEDLINE.

A series of thienopyrazine-based donor-acceptor-donor (D-A-D) near-IR (NIR) fluorescent compounds II were synthesized from I through a rapid, palladium-catalyzed C-H activation route. The dyes were studied through computational anal., electrochem. properties anal., and characterization of their photophys. properties. Large Stokes shifts of approx. 175 nm were observed, which led to near-IR emission. Computational evaluation shows that the origin of this large Stokes shift is a significant mol. reorganization particularly about the D-A bond. The series exhibits quantum yields of up to φ = >4%, with emission maxima ranging from 725 to 820 nm. The emission is strong in solution, in thin films, and also in isolation at the single-mol. level. Their stable emission at the single-mol. level makes these compounds good candidates for single-mol. photon sources in the near-IR.

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, COA of Formula: C4Br2N2O4S.

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

Jung, In Hwan published the artcileSynthesis and Search for Design Principles of New Electron Accepting Polymers for All-Polymer Solar Cells, SDS of cas: 52431-30-8, the publication is Chemistry of Materials (2014), 26(11), 3450-3459, database is CAplus.

New electron withdrawing monomers, thieno[2′,3′:5′,6′]pyrido[3,4-g]thieno[3,2-c]isoquinoline-5,11(4H,10H)-dione (TPTI) and fluorenedicyclopentathiophene dimalononitrile (CN), have been developed and used to form 12 alternating polymers having different monomer combinations: (a) weak donating monomer-strong accepting monomer, (b) weak accepting monomer-strong accepting monomer, (c) weak accepting monomer-weak accepting monomer, and (d) strong donating monomer-strong accepting monomer. It was found that LUMO energy levels of polymers are significantly determined by stronger electron accepting monomers and HOMO energy levels by the weak electron accepting monomers. In addition, fluorescent quantum yields of the TPTI-based polymers in chloroform solution are significantly decreased as the LUMO energy levels of the TPTI series of polymers become deeper. The quantum yield was found to be closely related with the photovoltaic properties, which reflects the effect of internal polarization on the photovoltaic properties. Only the electron accepting polymers showing SCLC mobility higher than 10^-4 Cm²/(V s) exhibited photovoltaic performance in blend films with a donor polymer, and the PTB7:PNPDI (1:1.8 weight/weight) device exhibited the highest power conversion efficiency of 1.03% (V_oc = 0.69 V, J_sc = -4.13 mA/Cm², FF = 0.36) under AM 1.5G condition, 100 W/Cm². We provide a large set of systematic structure-property relationships, which gives new perspectives for the design of electron accepting materials.

Chemistry of 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, SDS of cas: 52431-30-8.

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