Category: 7789-45-9

Related Products of 7789-45-9In 2020 ,《Controlled Synthesis of Concentrated Polymer Brushes with Ultralarge Thickness by Surface-Initiated Atom Transfer Radical Polymerization under High Pressure》 appeared in Macromolecules (Washington, DC, United States). The author of the article were Hsu, Shu-Yao; Kayama, Yuzo; Ohno, Kohji; Sakakibara, Keita; Fukuda, Takeshi; Tsujii, Yoshinobu. The article conveys some information:

The synthesis of ultrathick concentrated poly(Me methacrylate) (PMMA) brushes by atom transfer radical polymerization (ATRP) was investigated. The reactions were performed with a catalyst system of Cu(I)Br/dinonyl-2,2′-bipyridine (dN-bipy) and Cu(II)Br2/dN-bipy at 60°C under a high pressure of 500 MPa. The equilibrium constant for this catalyst system was determined to be 1.5 × 10-6, which followed the kinetics study and indicated good polymerization rate control. Under the high pressure of 500 MPa, a micrometer scale thick PMMA brush was obtained. During chain growth under the high pressure, the concentration of the deactivator catalyst was demonstrated to significantly affect the graft d. of PMMA brushes, which was correlated to the number of monomers added in activation-deactivation cycles. A novel “”cutoff”” experiment and gel permeation chromatog. demonstrated similar propagation for free polymers and graft polymers even under high pressure. The experimental part of the paper was very detailed, including the reaction process of Cupric bromide(cas: 7789-45-9Related Products of 7789-45-9)

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.Related Products of 7789-45-9

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Jing, Benxin; Wang, Xiaofeng; Shi, Yi; Zhu, Yingxi; Gao, Haifeng; Fullerton-Shirey, Susan K. published an article in 2021. The article was titled 《Combining hyperbranched and linear structures in solid polymer electrolytes to enhance mechanical properties and room-temperature ion transport》, and you may find the article in Frontiers in Chemistry (Lausanne, Switzerland).Electric Literature of Br2Cu The information in the text is summarized as follows:

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 The experimental process involved the reaction of Cupric bromide(cas: 7789-45-9Electric Literature of Br2Cu)

Cupric bromide(cas: 7789-45-9) can be used as reducing agent, when complexed by three molecules of pyridine initiators for the controlled polymerization of styrene, methyl acrylate and methyl methacrylate.Electric Literature of Br2Cu

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

The author of 《Rapid SARA ATRP of Methyl Acrylate in Polyethylene Glycol Mediated by a Mixed Sulfite/CuBr2 Catalytic System》 were Xian Rong Shen; Xiang, Yi Xin; Gao, Jian Gang. And the article was published in Polymer Science, Series B: Polymer Chemistry in 2019. Quality Control of Cupric bromide The author mentioned the following in the article:

Supplemental activator and reducing agent atom transfer radical polymerization (SARA ATRP) of Me acrylate was successfully performed in inexpensive, eco-friendly polyethylene glycol solvents and catalyzed by a mixed sulfite/CuBr2 system at room temperature The presence of polyethylene glycol in the reaction mixtures allowed fast and controlled polymerizations throughout the whole reaction time. Remarkably, a fast polymerization can be achieved with a monomer conversion reaching 90% in only 50 min using PEG 200 as the reaction solvent. The controlled character of the ATRP of Me acrylate was confirmed by the linear increase in mol. weight with monomer conversion, the narrow mol. weight distributions (Mw/Mn = 1.15) and the results of chain extension experiments 1H NMR anal. also confirmed the mol. structure and chain-end functionality of the obtained polymers, and the effects of PEG mol. weight and inorganic sulfites on the polymerization behavior were investigated. The results came from multiple reactions, including the reaction of Cupric bromide(cas: 7789-45-9Quality Control of Cupric bromide)

Cupric bromide(cas: 7789-45-9) can be used as reducing agent, when complexed by three molecules of pyridine initiators for the controlled polymerization of styrene, methyl acrylate and methyl methacrylate.Quality Control of Cupric bromide

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Quality Control of Cupric bromideIn 2019 ,《Pushing the Limit: Synthesis of SiO2-g-PMMA/PS Particle Brushes via ATRP with Very Low Concentration of Functionalized SiO2-Br Nanoparticles》 was published in Macromolecules (Washington, DC, United States). The article was written by Wang, Zongyu; Fantin, Marco; Sobieski, Julian; Wang, Zhenhua; Yan, Jiajun; Lee, Jaejun; Liu, Tong; Li, Sipei; Olszewski, Mateusz; Bockstaller, Michael R.; Matyjaszewski, Krzysztof. The article contains the following contents:

The kinetics and mechanism of the synthesis of SiO2-g-poly(Me methacrylate) (SiO2-g-PMMA) and SiO2-g-polystyrene (SiO2-g-PS) nanoparticles were investigated through studies conducted at very low concentrations of the ATRP initiator functionalized silica particles (SiO2-Br) in the presence of reducing agent (tin(II) 2-ethylhexanoate) and low ppm loadings of the CuII catalyst (25 ppm) complex. In the SiO2-g-PMMA system, the grafting d. decreased under very low concentrations (<100 ppm) of SiO2-Br. However, in the SiO2-g-PS system, the initiation efficiency, defined through the grafting d. of polymer chains on the particle surface, decreased significantly for lower concentrations of the initiator SiO2-Br. In addition, model systems with linear polymer chains (untethered) were studied to investigate the difference in initiation efficiency between polymers attached to nanoparticle surfaces and untethered chains. Because of the localization of initiating sites on the surface of nanoparticles and lower probabilities of collisions between nanoparticles, as compared to small initiator mols., particle brush systems exhibited less interparticle termination. This observation was employed to synthesize very high mol. weight (Mn> 500K) particle brushes with relatively narrow mol. weight distribution (Mw/Mn < 1.3).Cupric bromide(cas: 7789-45-9Quality Control of Cupric bromide) was used in this study.

Cupric bromide(cas: 7789-45-9) can be used as reducing agent, when complexed by three molecules of pyridine initiators for the controlled polymerization of styrene, methyl acrylate and methyl methacrylate.Quality Control of Cupric bromide

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

《Molecular Parameters Governing the Elastic Properties of Brush Particle Films》 was written by Lee, Jaejun; Wang, Zongyu; Zhang, Jianan; Yan, Jiajun; Deng, Tingwei; Zhao, Yuqi; Matyjaszewski, Krzysztof; Bockstaller, Michael R.. Product Details of 7789-45-9 And the article was included in Macromolecules (Washington, DC, United States) in 2020. The article conveys some information:

Elucidation of the mutual influence of composition and architecture of polymer canopies on the assembly and mech. properties of brush particle-based materials holds the promise of advancing the understanding of the governing parameters controlling interactions in hybrid materials and the development of novel functional materials. In this work, the elastic properties of three series of brush particle systems were investigated, differentiated by grafting d. as dense, intermediate, and sparse brush systems. Dense and intermediate systems displayed uniform microstructures; the degree of order (measured using Voronoi cell area anal.) increased with grafting d. For dense and intermediate brush particle systems, instrumented indentation anal. revealed an increase of the elastic modulus with the d.p. of tethered chains, in contrast to effective medium predictions. Furthermore, the contribution of ligands to particle interactions increased with decreasing grafting d. The results indicated that the response behavior of particle brush films in tensile-type deformations depends on dispersion interactions between ligands of adjacent brush particles. The more pronounced brush interdigitation in the case of intermediate graft densities enhanced the dispersion interactions between brush particles and hence the modulus of films. A reversed trend in modulus was observed in films of sparse brush particles that also featured the formation of string-like superstructures. Here, the elastic modulus was substantially increased for low-mol. ligands and continuously decreased with increasing d.p. of tethered chains along with a transition from string-like to uniform morphologies. Independent of grafting d., the elastic modulus of the pristine polymer was recovered in the limit of a high d.p. of polymer ligands.Cupric bromide(cas: 7789-45-9Product Details of 7789-45-9) was used in this study.

Cupric bromide(cas: 7789-45-9) can be used as reducing agent, when complexed by three molecules of pyridine initiators for the controlled polymerization of styrene, methyl acrylate and methyl methacrylate.Product Details of 7789-45-9

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Formula: Br2CuIn 2019 ,《A semiconducting organic-inorganic hybrid ([BrCH2CH2N(CH3)3]2+[CuBr4]2-) with switchable dielectric properties derived from an unusual piston-like displacive movement》 was published in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices. The article was written by Sui, Yan; Zhong, Ye-Shun; Wang, Jing-Jing; Xia, Qin; Wang, Liang-Jun; Liu, Dong-Sheng. The article contains the following contents:

According to quasi-spherical theory, structural modifications of spherical organic components are useful in obtaining ferroelec. or switchable dielec. organic-inorganic hybrid compounds, but how to tailor the spherical organic components is still unclear. In the current work, a prototype spherical Me4N+ cation was modified by replacing one of its H atoms with a CH2Br group, rather than with the widely studied Br atom, to obtain a new organic-inorganic hybrid compound, [BrCH2CH2NMe3]2+[CuBr4]2- (BETABCuBr). The structure, phase transition, and dielec. and optical properties of BETABCuBr were carefully characterized. Based on these results, BETABCuBr was indicated to undergo a reversible phase transition at ∼356 K, mainly due to a piston-like displacive movement of its Cu atom. The extension of the C chain was concluded to lead to a change of the phase transition mechanism from the typical order-disorder movement to an unusual displacive movement. The authors expect the results of this work to contribute to the exploration of new types of phase transition materials. After reading the article, we found that the author used Cupric bromide(cas: 7789-45-9Formula: Br2Cu)

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.Formula: Br2Cu

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

《Crystal structures of [(μ2-L1)dibromidodicopper(II)] dibromide and poly[[(μ2-L1)diiodidodicopper(I)]-di-μ-iodido-dicopper(I)], where L1 is 2,5,8,11,14,17-hexathia-[9.9](2,6,3,5)-pyrazinophane》 was published in Acta Crystallographica, Section E: Crystallographic Communications in 2020. These research results belong to Assoumatine, Tokoure; Stoeckli-Evans, Helen. SDS of cas: 7789-45-9 The article mentions the following:

The reaction of the hexathiapyrazinophane ligand, 2,5,8,11,14,17-hexathia-[9.9](2,6,3,5)-pyrazinophane (L1), with copper(II) dibromide led to the formation of a binuclear complex, [μ2-2,5,8,11,14,17-hexathia-[9.9](2,6,3,5)-pyrazinophane]bis[bromidocopper(II)] dibromide, [Cu2Br2(C16H24N2S6)]Br2, (I). The complex possesses inversion symmetry with the pyrazine ring being situated about a center of symmetry. The ligand coordinates to the copper(II) atom in a bis-tetradentate manner and the copper atom has a fivefold NS3Br coordination environment with a distorted shape. The reaction of ligand L1 with copper(I) iodide also gave a binuclear complex, which is bridged by a Cu2I2 unit to form a two-dimensional coordination polymer, poly[[μ2-2,5,8,11,14,17-hexathia-[9.9](2,6,3,5)-pyrazinophane]tetra-μ-iodido-tetracopper(I)], [Cu4I4(C16H24N2S6)]n, (II). The binuclear unit possesses inversion symmetry with the pyrazine ring being located about a center of symmetry. The Cu2I2 unit is also located about an inversion center. The two independent copper(I) atoms are both fourfold coordinate. That coordinating to the ligand L1 in a bis-tridentate manner has an NS2I coordination environment and an irregular shape, while the second copper(I) atom, where L1 coordinates in a bis-monodentate manner, has an SI3 coordination environment with an almost perfect tetrahedral geometry. In the crystal of I, the cations and Br- anions are linked by a number of C-H···S and C-H···Br hydrogen bonds, forming a supramol. network. In the crystal of II, the two-dimensional coordination polymers lie parallel to the ab plane and there are no significant inter-layer contacts present. After reading the article, we found that the author used Cupric bromide(cas: 7789-45-9SDS of cas: 7789-45-9)

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.SDS of cas: 7789-45-9

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Formula: Br2CuIn 2019 ,《Grafting of amphiphilic block copolymers on lignocellulosic materials via SI-AGET-ATRP》 was published in Journal of Polymer Science, Part A: Polymer Chemistry. The article was written by Vidiella del Blanco, Marta; Gomez, Vera; Fleckenstein, Peter; Keplinger, Tobias; Cabane, Etienne. The article contains the following contents:

Functionalizing biosourced materials is a major topic in the field of materials science. In particular, grafting polymerization techniques have been employed to change the surface properties of various substrates. Here, we report on the grafting of amphiphilic block copolymers in lignocellulosic materials using surface-initiated activators generated by electron transfer at. transfer radical polymerization (SI-AGET-ATRP). With this modification, it is possible to combine the interesting properties (anisotropy and high mech. stability) of lightweight lignocellulosic materials, such as wood, with the special properties of the grafted block copolymers. Hydroxyl groups on wood cell wall biopolymers were used for the chem. bonding of an alkyl bromide as the initiator for AGET-SI-ATRP of a highly hydrophilic monomer ([2-(methacryloyloxy)ethyl]trimethylammonium chloride) and a highly hydrophobic fluorinated monomer (2,2,3,3,4,4,5,5-octafluoropentyl methacrylate). The successful grafting of homopolymers and block copolymers onto the wood structure was confirmed through Fourier transform IR and Raman spectroscopy. The functionalization with the two homopolymers yielded lignocellulosic materials with opposite wettabilities, whereas by the adjustment of the ratio between the two copolymer blocks, it was possible to tune the wettability between these two extremes. The results came from multiple reactions, including the reaction of Cupric bromide(cas: 7789-45-9Formula: Br2Cu)

Cupric bromide(cas: 7789-45-9) can be used as reducing agent, when complexed by three molecules of pyridine initiators for the controlled polymerization of styrene, methyl acrylate and methyl methacrylate.Formula: Br2Cu

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Synthetic Route of Br2CuIn 2019 ,《Redox-switchable atom transfer radical polymerization》 was published in Chemical Communications (Cambridge, United Kingdom). The article was written by Dadashi-Silab, Sajjad; Lorandi, Francesca; Fantin, Marco; Matyjaszewski, Krzysztof. The article contains the following contents:

Temporal control in atom transfer radical polymerization (ATRP) relies on modulating the oxidation state of a copper catalyst, as polymer chains are activated by L/CuI and deactivated by L/CuII. (Re)generation of L/CuI activator has been achieved by applying a multitude of external stimuli. However, switching the Cu catalyst off by oxidizing to L/CuII through external chem. stimuli has not yet been investigated. A redox switchable ATRP was developed in which an oxidizing agent was used to oxidize L/CuI activator to L/CuII, thus halting the polymerization A ferrocenium salt or oxygen were used to switch off the Cu catalyst, whereas ascorbic acid was used to switch the catalyst on by (re)generating L/CuI. The redox switches efficiently modulated the oxidation state of the catalyst without sacrificing control over polymerization The experimental part of the paper was very detailed, including the reaction process of Cupric bromide(cas: 7789-45-9Synthetic Route of Br2Cu)

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.Synthetic Route of Br2Cu

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Synthetic Route of Br2CuIn 2019 ,《What happens in the dark? Assessing the temporal control of photo-mediated controlled radical polymerizations》 was published in Journal of Polymer Science, Part A: Polymer Chemistry. The article was written by Dolinski, Neil D.; Page, Zachariah A.; Discekici, Emre H.; Meis, David; Lee, In-Hwan; Jones, Glen R.; Whitfield, Richard; Pan, Xiangcheng; McCarthy, Blaine G.; Shanmugam, Sivaprakash; Kottisch, Veronika; Fors, Brett P.; Boyer, Cyrille; Miyake, Garret M.; Matyjaszewski, Krzysztof; Haddleton, David M.; de Alaniz, Javier Read; Anastasaki, Athina; Hawker, Craig J.. The article contains the following contents:

In this study, PET-RAFT, Cu-free ATRP, and Cu-mediated RDRP systems were selected as representative examples of photo-CRP methods. To facilitate an unbiased comparison across techniques, irradiation conditions were held constant (equivalent photon flux) and polymerization conditions, such as monomer concentration and targeted d.p., were fixed at 33 weight % and DP = 150. Temporal control experiments were also carried out with equal “”on”” and “”off”” times targeting conversions of 4̃0% with an initial “”off”” period conducted to establish a baseline before exposure to light. After reading the article, we found that the author used Cupric bromide(cas: 7789-45-9Synthetic Route of Br2Cu)

Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.Synthetic Route of Br2Cu

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”