Tag: M.W=300-350

Sen, Choong Ping published the artcileLow-Band-Gap BODIPY Conjugated Copolymers for Sensing Volatile Organic Compounds, SDS of cas: 52431-30-8, the publication is Chemistry – A European Journal (2015), 21(48), 17344-17354, database is CAplus and MEDLINE.

Conjugated polymers with strong photophys. properties were used in many applications. A homopolymer (P1) and five new low band gap copolymers based on 4,4′-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) and acceptors 3,6-dithienyldiketopyrrolopyrrole (P2), phthalimide (P3), benzotriazole (P4), 4,7-dithienyl[1,2,3]triazolo[4,5g]quinoxaline (P5), and 2,5-dithienylthieno[3,4-b]pyrazine (P6) were prepared by Sonogashira polymerization The characterization of polymers by using ¹H NMR, absorption, and emission spectroscopy is discussed. All polymers with high mol. weights (M_n) of 16,000 to 89,000 g mol^-1 showed absorption maxima in the deep-red region (λ=630-760 nm) in solution and exhibited significant red shifts (up to 70 nm) in thin films. Polymers P2, P5, and P6 showed narrow optical band gaps of 1.38, 1.35, and 1.38 eV, resp., which are significantly lower than that of P1 (1.63 eV). The HOMO and LUMO energy levels of the polymers were calculated by using cyclic voltammetry measurements. The LUMO energy levels of BODIPY-based alternating copolymers were independent of the acceptors; probably the major factor that tunes the LUMO energy levels of the polymers could be the BODIPY core. All polymers showed selective and reproducible detection of volatile organic solvents, such as toluene and benzene, which could be used for developing sensors.

Chemistry – A European Journal 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 C9H6FNO, SDS of cas: 52431-30-8.

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

Sengupta, Debabrata published the artcileIsolation of a Bimetallic Cobalt(III) Nitride and Examination of Its Hydrogen Atom Abstraction Chemistry and Reactivity toward H₂, Application of Cobalt(II) dibromo(1,2-dimethoxyethane), the publication is Journal of the American Chemical Society (2020), 142(18), 8233-8242, database is CAplus and MEDLINE.

Room temperature photolysis of the bis(azide)cobaltate(II) complex [Na(THF)_x][(^ketguan)Co(N₃)₂] (^ketguan = [(tBu₂CN)C(NDipp)₂]^–, Dipp = 2,6-diisopropylphenyl) (3a) in THF cleanly forms the binuclear Co nitride Na(THF)₄{[(^ketguan)Co(N₃)]₂(μ-N)} (1). Compound 1 represents the 1st example of an isolable, bimetallic Co nitride complex, and it was fully characterized by spectroscopic, magnetic, and computational analyses. D. functional theory supports a Co^III=N=Co^III canonical form with significant π-bonding between the Co centers and the nitride atom. Unlike other Group 9 bridging nitride complexes, no radical character is detected at the bridging N atom of 1. Indeed, 1 is unreactive toward weak C-H donors and even co-crystallizes with a mol. of cyclohexadiene (CHD) in its crystallog. unit cell to give 1·CHD as a room temperature stable product. Notably, addition of pyridine to 1 or photolyzed solutions of [(^ketguan)Co(N₃)(py)]₂ (4a) leads to destabilization via activation of the nitride unit, resulting in the mixed-valent Co(II)/Co(III) bridged imido species [(^ketguan)Co(py)][(^ketguan)Co](μ-NH)(μ-N₃) (5) formed from intermol. H atom abstraction (HAA) of strong C-H bonds (BDE ~100 kcal/mol). Kinetic rate anal. of the formation of 5 in the presence of C₆H₁₂ or C₆D₁₂ gives a KIE = 2.5 ± 0.1, supportive of a HAA formation pathway. The reactivity of the authors’ system was further probed by photolyzing benzene/pyridine solutions of 4a under H₂ and D₂ atms. (150 psi), which leads to the exclusive formation of the bis(imido) complexes [(^ketguan)Co(μ-NH)]₂ (6) and [(^ketguan)Co(μ-ND)]₂ (6-D), resp., as a result of dihydrogen activation. These results provide unique insights into the chem. and electronic structure of late 3d metal nitrides while providing entryway into C-H activation pathways.

Journal of the American Chemical Society 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 C7H5Br2F, Application of Cobalt(II) dibromo(1,2-dimethoxyethane).

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

Farley, Conner M. published the artcileCatalytic [5 + 1]-Cycloadditions of Vinylcyclopropanes and Vinylidenes, Name: Cobalt(II) dibromo(1,2-dimethoxyethane), the publication is Journal of the American Chemical Society (2020), 142(10), 4598-4603, database is CAplus and MEDLINE.

Polysubstituted cyclohexenes bearing 1,3 (meta) substitution patterns are challenging to access using the Diels-Alder reaction (the ortho-para rule). Here, a cobalt-catalyzed reductive [5 + 1]-cycloaddition between a vinylcyclopropane and a vinylidene to provide methylenecyclohexenes bearing all-meta relationships has been reported. Vinylidene equivalent are generated from 1,1-dichloroalkenes using Zn as a stoichiometric reductant. Exptl. observations are consistent with a mechanism involving a cobaltacyclobutane formed from a [2 + 2]-cycloaddition between a cobalt vinylidene and a vinylcyclopropane.

Journal of the American Chemical Society 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

Freytag, Karen published the artcileHybrid single-chain nanoparticles via the metal induced crosslinking of N-donor functionalized polymer chains, Name: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Polymer Chemistry (2017), 8(48), 7546-7558, database is CAplus.

A set of copolymers based on Bu acrylate and 4-vinylpyridine was synthesized with mol. weights ranging from 6000 to 70 000 g/mol and an amount of metal binding sites ranging from 3 to 22 mol%. These organosol. precursors with hydrophobic side chains were treated with Cu²⁺, Co²⁺, Ni²⁺, Zn²⁺, Fe²⁺, Mg²⁺, and Pd²⁺. The coordination of metal ions to pyridine moieties as versatile N-donors led to intrachain crosslinking and subsequent chain collapse. A set of 34 hybrid single-chain nanoparticles was prepd and their formation was monitored by dynamic light scattering and diffusion ordered NMR spectroscopy. The influence of mol. weight, mol. weight distribution, and amount of binding sites on size reduction during single-chain nanoparticle formation was discussed in the context of models given in the literature. An indication for the dependency of size reduction on the coordinative bond strength was given. Selected crosslinking metal centers were analyzed by theor. investigations. A significant freedom for the coordination geometry which can induce chain collapse was revealed.

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, Name: 2,5-Dibromo-3,4-dinitrothiophene.

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

Fowles, Gerald W. A. published the artcileDonor properties of simple ethers. II. Complexes of manganese(II), iron(II), cobalt(II) and nickel(II) halides with tetrahydrofuran and 1,2-dimethoxyethane, Name: Cobalt(II) dibromo(1,2-dimethoxyethane), the publication is Journal of Inorganic and Nuclear Chemistry (1969), 31(10), 3119-31, database is CAplus.

The reactions of several dihalides of Mn(II), Fe(II), Co(II), Ni(II), cu (II), and Cd(II), and Fe(III) chloride with tetrahydrofuran and 1,2-dimethoxyethane have been investigated and the following complexes prepared: MCl2.1.5-C4H8O (M = Mn, Fe, or Co), CoX2.C4H8O (X = Br or I), NiCl2.C4H8O.EtOH, MX2.C4H10O2 (M = Mn, Fe, Co, Ni, or Cd and X = Cl, Br, or I), FeCl3.C4H10O2, and 2CuCl2.C4H10O2. The structures of several of these complexes have been deduced from a study of their electronic spectra, far-ir spectra, and room temperature magnetic properties. However, the magnetic moments of several of these complexes (e.g. pseudotetrahedral CoX2.-C4H10O2) are unusual in that they exhibit marked temperature dependence, although the ground state formally is an orbital singlet. The tetrahydrofuran derivatives MCl2.1.5C4H8O are of unusual stoichiometry, and while it is suggested that these products are a 1:1 mixture of tetrahedral CoCl2.2C4H8O and octahedral CoCl2.C4H8O their structure remains in some doubt.

Journal of Inorganic and Nuclear 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, Name: Cobalt(II) dibromo(1,2-dimethoxyethane).

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

Crosignani, Stefano published the artcileDiscovery of Potent, Selective, and Orally Bioavailable Alkynylphenoxyacetic Acid CRTH2 (DP2) Receptor Antagonists for the Treatment of Allergic Inflammatory Diseases, Name: 4-((3-Bromo-4-methylphenyl)sulfonyl)morpholine, the publication is Journal of Medicinal Chemistry (2011), 54(20), 7299-7317, database is CAplus and MEDLINE.

New phenoxyacetic acid antagonists of CRTH2 are described. Following the discovery of a hit compound, I, by a focused screening, high protein binding was identified as its main weakness. Optimization aimed at reducing serum protein binding led to the identification of several compounds that showed not only excellent affinities for the receptor (41 compounds with K_i < 10 nM) but also excellent potencies in a human whole blood assay (IC₅₀ < 100 nM; PGD2-induced eosinophil shape change). Addnl. optimization of the pharmacokinetic characteristics led to the identification of several compounds suitable for in vivo testing. Of these, II (R¹ = n-Pr, R² = Me; R¹ = n-Pr, R² = F) were tested in two different pharmacol. models (acute FITC-mediated contact hypersensitivity and ovalbumin-induced eosinophilia models) and found to be active after oral dosing (10 and 30 mg/kg).

Journal of Medicinal Chemistry published new progress about 850429-74-2. 850429-74-2 belongs to bromides-buliding-blocks, auxiliary class Morpholine,Bromide,Sulfamide,Benzene, name is 4-((3-Bromo-4-methylphenyl)sulfonyl)morpholine, and the molecular formula is C11H14BrNO3S, Name: 4-((3-Bromo-4-methylphenyl)sulfonyl)morpholine.

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

Dunn, Derek published the artcileFrom an atypical wake-promoting agent to potent histamine-3 receptor inverse agonists, HPLC of Formula: 957061-13-1, the publication is Chemical Biology & Drug Design (2013), 81(3), 433-435, database is CAplus and MEDLINE.

Utilizing atypical wake-promoting agent modafinil (inactive in both rH₃ and hH₃ binding assays) as a launching pad, a series of sulfinyl- and sulfone-derived H₃ receptor inverse agonists were developed. A potent member of the series displayed excellent selectivity against related family members (H₁, H₂, and H₄ receptors).

Chemical Biology & Drug Design published new progress about 957061-13-1. 957061-13-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Ether,Boronate Esters, name is 2-(4-(3-Bromopropoxy)phenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C15H22BBrO3, HPLC of Formula: 957061-13-1.

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

Schwiderski, Ryan L. published the artcileSynthesis and Characterization of Thieno[3,4-b]pyrazine-Based Terthienyls: Tunable Precursors for Low Band Gap Conjugated Materials, Synthetic Route of 52431-30-8, the publication is Journal of Organic Chemistry (2013), 78(11), 5453-5462, database is CAplus and MEDLINE.

Synthetic methods have been developed for the preparation of new 2,3-dihalo- and 2,3-ditriflato-5,7-bis(2-thienyl)thieno[3,4-b]pyrazines. From these reactive intermediates, a variety of new 2,3-difunctionalized 5,7-bis(2-thienyl)thieno[3,4-b]pyrazines have been produced as precursors to conjugated materials. Structural, electronic, and optical characterization of these new analogs illustrate the extent to which the electronic nature of the functional groups can be used to tune the electronic properties of these thieno[3,4-b]pyrazine-based terthienyl units.

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 C9H22OSi, Synthetic Route of 52431-30-8.

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

Adusumalli, Srinivasa Rao published the artcileAldehydes can switch the chemoselectivity of electrophiles in protein labeling, Application of 4-((6-Bromohexyl)oxy)-2-hydroxybenzaldehyde, the publication is Organic & Biomolecular Chemistry (2018), 16(48), 9377-9381, database is CAplus and MEDLINE.

We show that the chemoselectivity of an electrophile in protein labeling can be promiscuous. An aldehyde enables switching of chemoselectivity of an epoxide and a sulfonate ester along with an enhanced rate of reaction. The chem. technol. renders single-site installation of diverse probes on a protein and delivers anal. pure tagged proteins.

Organic & Biomolecular Chemistry published new progress about 1207448-58-5. 1207448-58-5 belongs to bromides-buliding-blocks, auxiliary class Bromide,Benzene,Phenol,Ether,Aldehyde, name is 4-((6-Bromohexyl)oxy)-2-hydroxybenzaldehyde, and the molecular formula is C13H17BrO3, Application of 4-((6-Bromohexyl)oxy)-2-hydroxybenzaldehyde.

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

Yen, Wei-Che published the artcileSynthesis and characterization of low bandgap copolymers based on indenofluorene and thiophene derivative, HPLC of Formula: 52431-30-8, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2009), 47(19), 5044-5056, database is CAplus.

A series of low band gap, highly soluble alternating conjugated copolymers, comprised of 11,11,12,12-tetrahexylindenofluorene and thiophene derivatives (P1–P4), were synthesized via Pd-catalyzed Suzuki coupling reaction with very good yields. Described here are the synthesis, thermal, optical, and electrochem. properties of these new copolymers as potential new active materials for electronic and optoelectronic device applications. P1 and P2 have electron donating non-π-substituents with ethylenedioxy and propylenedioxy bridging the 3,3 positions of the cyclopentadithiophene groups; whereas P3 and P4 have electron withdrawing π-substituents (carbonyl and pyrazine groups on P3 and P4, resp.). For the main absorptions in UV-vis spectrum, P1 and P2 displayed more red absorptions in comparison with P3 and P4. Nevertheless, much suppressed quantum yields are exhibited by P3 and P4. The behaviors of P3 can be attributed to the significant charge transfer interactions between the π-substituents and the conjugated polymer backbone that leads to a less allowed optical transition between the ground and the lowest excited state. For P4, the weak fluorescence might associate with energy transfer from indenofluorene to the low band gap thiophene-pyrazinethiophene-thiophene (T-PT-T) unit. In comparison with the corresponding polymers containing fluorene instead of indenofluorene, the use of indenofluorene exhibited mixed effects on the optical properties and improved solubility © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5044-5056, 2009.

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 C19H34ClN, HPLC of Formula: 52431-30-8.

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