Category: 7789-45-9

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Journal of Membrane Science called Thin-film composite membranes based on hyperbranched poly(ethylene oxide) for CO2/N2 separation, Author is Zhang, Gengyi; Tran, Thien N.; Huang, Liang; Deng, Erda; Blevins, Adrienne; Guo, Wenji; Ding, Yifu; Lin, Haiqing, which mentions a compound: 7789-45-9, SMILESS is [Cu+2].[Br-].[Br-], Molecular Br2Cu, Application In Synthesis of Cupric bromide.

Crosslinked amorphous poly(ethylene oxide) (XLPEO) is one of the leading membrane materials for post-combustion CO2 capture. For example, XLPEO prepared from poly(ethylene glycol) Me ether acrylate (PEGMEA) exhibited CO2 permeability of 570 Barrer and CO2/N2 selectivity of 41 at 35°C. However, these XLPEOs cannot be dissolved in coating solutions, making it impossible to be fabricated into thin-film composite (TFC) membranes using state-of-the-art manufacturing processes. In this study, we synthesized high mol. weight yet soluble HPEO via atom transfer radical polymerization (ATRP). These polymers were thoroughly characterized and compared with XLPEO, including thermal transitions, free volumes, and pure-gas sorption and permeation properties. A polymer with the best combination of CO2 permeability (540 Barrer) and CO2/N2 selectivity (43) was fabricated into defect-free TFC membranes with a thickness as thin as 506 ± 44 nm. When challenged with simulated flue gas containing water vapor at 35°C for over 100 h, the membrane shows stable CO2 permeance of 850 GPU and CO2/N2 selectivity of 37, comparable to the leading com. membranes for carbon capture.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Cupric bromide, is researched, Molecular Br2Cu, CAS is 7789-45-9, about Fastening Br- Ions at Copper-Molecule Interface Enables Highly Efficient Electroreduction of CO2 to Ethanol, the main research direction is copper bromide dodecanethiol carbon dioxide electroreduction catalyst.Recommanded Product: Cupric bromide.

Developing advanced electrocatalysts to convert CO2 into liquid fuels such as ethanol is critical for utilizing intermittent renewable energy. The formation of ethanol, however, is generally less favored compared with the other hydrocarbon products from Cu-based electrocatalysts. Herein, we construct an efficient electrocatalyst for ethanol formation based on dodecanethiol-modified CuBr, which in situ generates a robust Br-doped Cu-thiol interface. The obtained electrocatalyst shows a significantly enhanced C2+ Faradaic efficiency of 72%, among which the Faradaic efficiency of ethanol is 35.9%. Notably, the ratio of ethanol to ethylene significantly increases from 0.32 for pristine CuBr to 1.08 for dodecanethiol-modified CuBr. The improved electrocatalytic activity is related to the modulated adsorption energy of key intermediates on the Br-doped Cu-thiol interface as verified by d. functional theory (DFT) calculations The present study highlights the great potential of utilizing hybrid metal-mol. interfaces for improving electrocatalytic CO2 conversion.

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Parkatzidis, Kostas; Rolland, Manon; Truong, Nghia P.; Anastasaki, Athina published the article 《Tailoring polymer dispersity by mixing ATRP initiators》. Keywords: polymethyl acrylate preparation ATRP initiator polymer dispersity kinetics.They researched the compound: Cupric bromide( cas:7789-45-9 ).Application In Synthesis of Cupric bromide. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:7789-45-9) here.

Herein we present a simple batch method to control polymer dispersity using a mixture of two ATRP initiators with different reactivities. A wide dispersity spectrum (D ∼ 1.1-1.7) is achieved by altering the ratio between the two ATRP initiators while sustaining fairly monomodal mol. weight distributions. Depending on the targeted dispersity, a distinct kinetic profile was observed and, in contrast to previous ATRP approaches, near-quant. conversions were obtained even for the highest dispersities. High end-group fidelity was also maintained in all cases as exemplified by chain extensions. Significantly, this method can be applied to various ATRP protocols as well as to various monomer classes.

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Product Details of 7789-45-9. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Cupric bromide, is researched, Molecular Br2Cu, CAS is 7789-45-9, about Synthesis of AgNWs using copper bromide as stabilizing agent and oxygen scavenger and their application in conductive thin films. Author is Fahad, Shah; Yu, Haojie; Wang, Li; Liu, Jinhua; Li, Songbiao; Fu, Junchao; Amin, Bilal Ul; Khan, Rizwan Ullah; Mehmood, Sahid; Haq, Fazal; Nan, Wang; Usman, Muhammad.

Silver nanowires (AgNWs) have attracted growing interest because of their wide range of applications in modern nano electronic appliances. During polyol method, the presence of cations and anions in the reaction solution has influence on the final morphol. of AgNWs. Here we report a feasible way to prepare AgNWs by polyol method. Copper bromide (CuBr2) salt was used to provide anions and cations in the reaction solution The anions (Br-) helps in reducing the amount of free Ag+ by forming silver bromide (AgBr) during initial silver seeds formation and the cations scavenge oxygen from the surface of AgNWs during preferential growth of the AgNWs. Ethylene glycol (EG) was used as a solvent and reducing agent, silver nitrate (AgNO3) was used as Ag source and polyvinyl pyrrolidone (PVP) was used as a capping agent. The effects of various factors which influence the final morphol. of AgNWs were studied. AgNWs were successfully synthesized in the presence of CuBr2 salt. The morphol. of the synthesized AgNWs was characterized by the SEM and TEM. The crystallinity was characterized by HRTEM, SAED and XRD. The LSPR peaks of Ag nanostructures were revealed by UV-Vis spectroscopy. The conductive properties of AgNWs thin conductive films were studied by coating the synthesized nanowires on polyethylene terephthalate (PET) substrate.

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Synthetic Route of Br2Cu. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: Cupric bromide, is researched, Molecular Br2Cu, CAS is 7789-45-9, about Imine-based covalent organic framework as photocatalyst for visible-light-induced atom transfer radical polymerization.

Photoinduced atom transfer radical polymerization (ATRP) is an economical and environment-friendly method for synthesizing polymers with pre-designable structures and precise mol. weight Although significant progress for copper-mediated photoinduced ATRP has been achieved, several drawbacks still remain, such as poor electron transfer capability and absorption bands of photocatalysts near UV region. Herein, imine-based covalent organic framework, TAPPy-TPA-COF, has been synthesized as potential heterogeneous photocatalyst for photoinduced ATRP. The “”living”” feature of polymerizations of Me methacrylate (MMA) can be well controlled by efficiency maintain the balance between activation and inactivation of CuI and CuII. The chain extension experiments have further demonstrated the chain-end fidelity of polymers. Meanwhile, the catalyst recycle experiments have revealed stability of TAPPy-TPA-COF toward ATRP processes. These results support the feasibility of using COFs as heterogeneous photocatalysts for copper-mediated ATRP under visible light irradiation

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Jing, Benxin; Wang, Xiaofeng; Shi, Yi; Zhu, Yingxi; Gao, Haifeng; Fullerton-Shirey, Susan K. published an article about the compound: Cupric bromide( cas:7789-45-9,SMILESS:[Cu+2].[Br-].[Br-] ).Recommanded Product: 7789-45-9. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:7789-45-9) through the article.

Polyethylene oxide (PEO)-based polymers are commonly studied for use as a solid polymer electrolyte for rechargeable Li-ion batteries; however, simultaneously achieving sufficient mech. integrity and ionic conductivity has been a challenge. To address this problem, a customized polymer architecture is demonstrated wherein PEO bottle-brush arms are hyperbranched into a star architecture and then functionalized with end-grafted, linear PEO chains. The hierarchical architecture is designed to minimize crystallinity and therefore enhance ion transport via hyperbranching, while simultaneously addressing the need for mech. integrity via the grafting of long, PEO chains (Mn = 10,000). The polymers are doped with lithium bis(trifluoromethane) sulfonimide (LiTFSI), creating hierarchically hyperbranched (HB) solid polymer electrolytes. Compared to electrolytes prepared with linear PEO of equivalent mol. weight, the HB PEO electrolytes increase the room temperature ionic conductivity from ∼ 2.5 x 10-6 to 2.5 x 10-5 S/cm. The conductivity increases by an addnl. 50% by increasing the block length of the linear PEO in the bottle brush arms from Mn = 1,000 to 2,000. The mech. properties are improved by end-grafting linear PEO (Mn = 10,000) onto the terminal groups of the HB PEO bottle-brush. Specifically, the Young’s modulus increases by two orders of magnitude to a level comparable to com. PEO films, while only reducing the conductivity by 50% below the HB electrolyte without grafted PEO. This study addresses the trade-off between ion conductivity and mech. properties, and shows that while significant improvements can be made to the mech. properties with hierarchical grafting of long, linear chains, only modest gains are made in the room temperature conductivity

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Perego, Michele; Kuschlan, Stefano; Seguini, Gabriele; Chiarcos, Riccardo; Gianotti, Valentina; Antonioli, Diego; Sparnacci, Katia; Laus, Michele published an article about the compound: Cupric bromide( cas:7789-45-9,SMILESS:[Cu+2].[Br-].[Br-] ).Reference of Cupric bromide. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:7789-45-9) through the article.

Phosphorus δ-layers in SiO2 were prepared by means of poly(Me methacrylate) (PMMA) terminated with a phosphorus-containing moiety acting as an anchoring group. In particular, grafting of two P-terminated PMMA samples with Mn = 7.5 kg/mol (D = 1.14) and Mn = 17.8 kg/mol (D = 1.23) onto 10 nm thick SiO2 films deposited on Si substrates was investigated, focusing on the thickness evolution of the brush layer as a function of the processing parameters, i.e., annealing temperature and time. Upon removal of the polymer chains and subsequent encapsulation into a SiO2 matrix, the concentration of phosphorus atoms into the P δ-layers has been monitored by time-of-flight secondary ion mass spectrometry. The effective P dose in the P δ-layer is mainly dictated by the mol. weight of the P-terminated PMMA, and the doping process results are highly reproducible, provided that tight control over the exptl. protocol is granted. However, although the grafting d. is expected to progressively increase as a function of annealing time with a linear correlation between grafting d. and thickness, the measured P dose in the δ-layers is observed to follow the opposite trend. This effect was accounted for by considering a distortion of the mol. weight distribution of the grafted species with respect to the initial mol. weight distribution of the polymer. The overall picture reveals important information about the mechanism and dynamics governing the “”grafting to”” process of P-terminated PMMA polymers onto nondeglazed Si substrates.

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Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 7789-45-9, is researched, SMILESS is [Cu+2].[Br-].[Br-], Molecular Br2CuJournal, ACS Macro Letters called Activation of Antibiotic-Grafted Polymer Brushes by Ultrasound, Author is Zou, Miancheng; Zhao, Pengkun; Huo, Shuaidong; Goestl, Robert; Herrmann, Andreas, the main research direction is antibiotic polymer brush ultrasound.Name: Cupric bromide.

The ultrasound-mediated activation of drugs from macromol. architectures using the principles of polymer mechanochem. (sonopharmacol.) is a promising strategy to gain spatiotemporal control over drug activity. Yet, conceptual challenges limit the applicability of this method. Especially low drug-loading content and low mechanochem. efficiency require the use of high carrier mass concentrations and prolonged exposure to ultrasound. Moreover, the activated drug is generally shielded by the hydrodynamic coil of the attached polymer fragment leading to a decreased drug potency. Here we present a carrier design for the ultrasound-induced activation of vancomycin, which is deactivated with its H-bond-complementary peptide target sequence. We show that the progression from mechanophore-centered linear chains to mechanophore-decorated polymer brushes increases drug-loading content, mechanochem. efficiency, and drug potency. These results may serve as a design guideline for future endeavors in the field of sonopharmacol.

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Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Research Support, Non-U.S. Gov’t, Journal of Hazardous Materials called Bromination of carbon and formation of PBDD/Fs by copper bromide in oxidative thermal process, Author is Kojima, Yusuke; Fujimori, Takashi; Goto, Akitoshi; Shiota, Kenji; Kunisue, Tatsuya; Takaoka, Masaki, which mentions a compound: 7789-45-9, SMILESS is [Cu+2].[Br-].[Br-], Molecular Br2Cu, Related Products of 7789-45-9.

Brominated aromatic compounds are unintentionally generated during various thermal processes, including municipal solid waste incineration, elec.-waste open burning, and secondary copper smelting. Copper (Cu) plays an important role in the formation of brominated aromatic compounds In the present study, the thermochem. behaviors of Cu and Br in model samples, including copper bromide (CuBr2) and activated carbon, were studied using in situ X-ray absorption near-edge structure (XANES) and thermogravimetry. Quantification of polybrominated dibenzo-p-dioxins/furans (PBDD/Fs) was also conducted by gas chromatograph-high resolution mass spectrometer. Three key reactions were identified: (i) the reduction of CuBr2 to CuBr (room temperature to 300°C), (ii) the generation of Br bonded with aromatic carbon (150-350°C), and (iii) the oxidation of copper (>350°C). Maximum amounts of PBDD/Fs were found in residual solid phase after heating at 300°C. The anal. results indicated the direct bromination of aromatic carbon by the debromination of copper bromides (I, II) and that CuBr and CuO acted as catalysts in the oxidation of the carbon matrix. The bromination mechanisms revealed in this study are essential to the de novo formation of PBDD/Fs and other brominated aromatic compounds

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Recommanded Product: 7789-45-9. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Cupric bromide, is researched, Molecular Br2Cu, CAS is 7789-45-9, about Effect of Dispersity on the Conformation of Spherical Polymer Brushes. Author is Li, Tzu-Han; Yadav, Vivek; Conrad, Jacinta C.; Robertson, Megan L..

We show that dispersity (D) markedly alters the conformation of spherical polymer brushes. The average lengths (lb) of poly(tert-Bu acrylate) (PtBA) brushes of varying D grafted to nanoparticles were measured using dynamic light scattering. In the semidilute polymer brush (SDPB) regime, the lb of PtBA and polymers from earlier studies of various D could be cleanly collapsed onto a master curve as a function of the scaling variable Nwσ1/3, where Nw is the weight-average d.p. and σ is the grafting d. In the concentrated polymer brush (CPB) regime, however, lb collapsed onto a bifurcated curve as a function of the scaling variable Nwσ1/2, indicating D more strongly affects the average length of brushes with low Nwσ1/2. We propose that the stretching of the stem near the particle surface due to interchain interactions in the CPB regime leads to greater lb in broad dispersity brushes of low but not high Nwσ1/2.

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