Tag: 200-300

Recommanded Product: 13395-16-9In 2022 ,《Performance of a C-containing Cu-based photocatalyst for the degradation of tartrazine: Comparison of performance in a slurry and CPC photoreactor under artificial and natural solar light》 was published in Journal of Colloid and Interface Science. The article was written by Munoz-Flores, Paula; Poon, Po S.; Ania, Conchi O.; Matos, Juan. The article contains the following contents:

A carbon-containing Cu-based material (Cu@C) was used as photocatalyst for the degradation of a commonly food-industry azo-dye (tartrazine, also called Y5), under solar light at laboratory and pilot scale photoreactors. Important performance parameters such as dark adsorption capacity, catalyst’s loading and initial concentration of the dye were first optimized in a slurry photoreactor at laboratory scale under artificial solar light following the kinetics of degradation of the dye. Afterwards, the photocatalytic activity was investigated at pilot scale in a compound parabolic collector (CPC) photoreactor operating for 10 h of irradiation The degradation of tartrazine is among the highest values reported for alternative metal oxide semiconductors, in both photoreactor configurations. Catalytic data revealed a 3 times faster degradation kinetics of tartrazine in the CPC photoreactor under natural solar light than in the slurry reactor under artificial solar light. This behavior indicates that a moderate photon flux in the CPC is more adequate to operate with the prepared photocatalyst, as it minimizes the recombination of charge carriers in the catalyst. This is important, since most of the photocatalytic tests designed to evaluate the activity of novel materials are frequently carried out under simulated solar light and disregard the impact of photon flux in outdoor conditions. In addition to this study using Bis(acetylacetone)copper, there are many other studies that have used Bis(acetylacetone)copper(cas: 13395-16-9Recommanded Product: 13395-16-9) was used in this study.

Bis(acetylacetone)copper(cas: 13395-16-9) is used as PVC stabilizer, and curing agents for epoxy resins, acrylic adhesives and silicone rubbers. It is also used as solvents, lubricant additives, paint drier, and pesticides.Recommanded Product: 13395-16-9

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

《Atom Transfer Radical Polymerization Driven by Near-Infrared Light with Recyclable Upconversion Nanoparticles》 was written by Zhang, Wenjie; He, Jianhao; Lv, Chunna; Wang, Qianyi; Pang, Xinchang; Matyjaszewski, Krzysztof; Pan, Xiangcheng. Product Details of 7789-45-9This research focused onupconversion nanoparticle photo ATRP methacrylate acrylate. The article conveys some information:

Near-IR (NIR) photoinduced chem. processes are highly attractive for specific applications owing to the deep penetration of NIR into the nontransparent materials including biol. and synthetic materials. Robust NIR photoinduced atom transfer radical polymerization (photoATRP) was achieved using upconversion nanoparticles (UCNPs) as an internal light converter to turn a 980 nm NIR light to the wavelength of UV/vislight. This NIR photoATRP was capable of polymerizing both hydrophobic and hydrophilic monomers at a low loading of ppm concentrations of the CuBr2/tris(2-pyridylmethyl)amine catalyst under the irradiation of a 980 nm NIR light (4 W/cm2) and UCNPs with reusable performance, providing well-defined polymers with predetermined mol. weight, low dispersity, and excellent chain-end fidelity. The switching of light “”on/off”” showed an excellent temporal control of the polymerization The NIR photoATRP exhibited excellent penetrations through several visible light-proof barriers using NIR light, and it may provide future directions of photopolymerization in nontransparent systems, especially biol. systems containing photosensitive moieties. In the experiment, the researchers used Cupric bromide(cas: 7789-45-9Product Details 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.Product Details of 7789-45-9

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

Sun, Mingkang; Lorandi, Francesca; Yuan, Rui; Dadashi-Silab, Sajjad; Kowalewski, Tomasz; Matyjaszewski, Krzysztof published an article in 2021. The article was titled 《Assemblies of polyacrylonitrile-derived photoactive polymers as blue and green light photo-cocatalysts for Cu-catalyzed ATRP in water and organic solvents》, and you may find the article in Frontiers in Chemistry (Lausanne, Switzerland).Safety of Cupric bromide The information in the text is summarized as follows:

Photoluminescent nanosized quasi-spherical polymeric assemblies prepared by the hydrothermal reaction of polyacrylonitrile (PAN), ht-PLPPAN, were demonstrated to have the ability to photo-induce atom transfer radical polymerization (ATRP) catalyzed by low, ppm concentrations of CuII complex with tris(2-pyridylmethyl)amine (TPMA). Such photo induced ATRP reactions of acrylate and methacrylate monomers were performed in water or organic solvents, using ht-PLPPAN as the photo-cocatalyst under blue or green light irradiation Mechanistic studies indicate that ht-PLPPAN helps to sustain the polymerization by facilitating the activation of alkyl bromide species by two modes: (1) green or blue light-driven photoreduction of the CuII catalyst to the activating CuI form, and (2) direct activation of dormant alkyl bromide species which occurs only under blue light. The photoreduction of the CuII complex by ht-PLPPAN was confirmed by linear sweep voltammetry performed under illumination. Anal. of the polymerization kinetics in aqueous media indicated even though CuI complexes comprised only 1-1.4% of all Cu species at equilibrium, they exhibited high activation rate constant and activated the alkyl bromide initiators five to six orders of magnitude faster than ht-PLPPAN. After reading the article, we found that the author used Cupric bromide(cas: 7789-45-9Safety of Cupric bromide)

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.Safety of Cupric bromide

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

The author of 《Impact of Organometallic Intermediates on Copper-Catalyzed Atom Transfer Radical Polymerization》 were Fantin, Marco; Lorandi, Francesca; Ribelli, Thomas G.; Szczepaniak, Grzegorz; Enciso, Alan E.; Fliedel, Christophe; Thevenin, Lucas; Isse, Abdirisak A.; Poli, Rinaldo; Matyjaszewski, Krzysztof. And the article was published in Macromolecules (Washington, DC, United States) in 2019. HPLC of Formula: 7789-45-9 The author mentioned the following in the article:

In atom transfer radical polymerization (ATRP), radicals (R•) can react with CuI/L catalysts forming organometallic complexes, R-CuII/L (L = N-based ligand). R-CuII/L favors addnl. catalyzed radical termination (CRT) pathways, which should be understood and harnessed to tune the polymerization outcome. Therefore, the preparation of precise polymer architectures by ATRP depends on the stability and on the role of R-CuII/L intermediates. Herein, spectroscopic and electrochem. techniques were used to quantify the thermodn. and kinetic parameters of the interactions between radicals and Cu catalysts. The effects of radical structure, catalyst structure and solvent nature were investigated. The stability of R-CuII/L depends on the radical-stabilizing group in the following order: cyano > ester > Ph. Primary radicals form the most stable R-CuII/L species. Overall, the stability of R-CuII/L does not significantly depend on the electronic properties of the ligand, contrary to the ATRP activity. Under typical ATRP conditions, the R-CuII/L build-up and the CRT contribution may be suppressed by using more ATRP-active catalysts or solvents that promote a higher ATRP activity.Cupric bromide(cas: 7789-45-9HPLC of Formula: 7789-45-9) was used in this study.

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.HPLC of Formula: 7789-45-9

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

《Remarkable reversal of 13C-NMR assignment in d1, d2 compared to d8, d9 acetylacetonate complexes: analysis and explanation based on solid-state MAS NMR and computations》 was written by Andersen, Anders B. A.; Pyykkonen, Ari; Jensen, Hans Joergen Aa.; McKee, Vickie; Vaara, Juha; Nielsen, Ulla Gro. Safety of Bis(acetylacetone)copperThis research focused ontransition metal acetylacetonate complex NMR; optimized mol structure transition metal acetylacetonate complex; crystal structure transition metal acetylacetonate complex. The article conveys some information:

13C solid-state MAS NMR spectra of a series of paramagnetic metal acetylacetonate complexes; [VO(acac)2] (d1, S = 1/2), [V(acac)3] (d2, S = 1), [Co(acac)3], [Ni(acac)2(H2O)2] (d8, S = 1), and [Cu(acac)2] (d9, S = 1/2), were assigned using modern NMR shielding calculations This provided a reliable assignment of the chem. shifts and a qual. insight into the hyperfine couplings. Our results show a reversal of the isotropic 13C shifts, δiso(13C), for CH3 and CO between the d1 and d2vs. the d8 and d9 acetylacetonate complexes. The CH3 shifts change from about -150 ppm (d1,2) to roughly 1000 ppm (d8,9), whereas the CO shifts decrease from 800 ppm to about 150 ppm for d1,2 and d8,9, resp. This was rationalized by comparison of total spin-d. plots and computed contact couplings to those corresponding to singly occupied MOs (SOMOs). This revealed the interplay between spin delocalization of the SOMOs and spin polarization of the lower-energy MOs, influenced by both the mol. symmetry and the d-electron configuration. A large pos. chem. shift results from spin delocalization and spin polarization acting in the same direction, whereas their cancellation corresponds to a small shift. The SOMO(s) for the d8 and d9 complexes are σ-like, implying spin-delocalization on the CH3 and CO groups of the acac ligand, canceled only for CO by spin polarization. In contrast, the SOMOs of the d1 and d2 systems are π-like and a large CO-shift results from spin polarization, which accounts for the reversed assignment of δiso(13C) for CH3 and CO. The experimental process involved the reaction of Bis(acetylacetone)copper(cas: 13395-16-9Safety of Bis(acetylacetone)copper)

Bis(acetylacetone)copper(cas: 13395-16-9) catalyzes coupling and carbene transfer reactions. Metal acetylacetonates are used as catalysts for polymerization of olefins and transesterification. Safety of Bis(acetylacetone)copper

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

Application of 13395-16-9In 2019 ,《Direct synthesis of multiplexed metal-nanowire-based devices by using carbon nanotubes as vector templates》 was published in Angewandte Chemie, International Edition. The article was written by Clement, Pierrick; Xu, Xinzhao; Stoppiello, Craig T.; Rance, Graham A.; Attanzio, Antonio; O’Shea, James N.; Temperton, Robert H.; Khlobystov, Andrei N.; Lovelock, Kevin R. J.; Seymour, Jake M.; Fogarty, Richard M.; Baker, Alastair; Bourne, Richard A.; Hall, Brendan; Chamberlain, Thomas W.; Palma, Matteo. The article contains the following contents:

We present the synthesis of metal nanowires in a multiplexed device configuration using single-walled carbon nanotubes (SWNTs) as nanoscale vector templates. The SWNT templates control the dimensionality of the wires, allowing precise control of their size, shape, and orientation; moreover, a solution-processable approach enables their linear deposition between specific electrode pairs in electronic devices. Elec. characterization demonstrated the successful fabrication of metal nanowire electronic devices, while multiscale characterization of the different fabrication steps revealed details of the structure and charge transfer between the material encapsulated and the carbon nanotube. Overall the strategy presented allows facile, low-cost, and direct synthesis of multiplexed metal nanowire devices for nanoelectronic applications. The experimental process involved the reaction of Bis(acetylacetone)copper(cas: 13395-16-9Application of 13395-16-9)

Bis(acetylacetone)copper(cas: 13395-16-9) catalyzes coupling and carbene transfer reactions. Metal acetylacetonates are used as catalysts for polymerization of olefins and transesterification. Application of 13395-16-9

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”

Synthetic Route of Br2CuIn 2021 ,《Precise Control of Both Dispersity and Molecular Weight Distribution Shape by Polymer Blending》 was published in Angewandte Chemie, International Edition. The article was written by Whitfield, Richard; Truong, Nghia P.; Anastasaki, Athina. The article contains the following contents:

The breadth and the shape of mol. weight distributions can significantly influence fundamental polymer properties that are critical for various applications. However, current approaches require the extensive synthesis of multiple polymers, are limited in dispersity precision and are typically incapable of simultaneously controlling both the dispersity and the shape of mol. weight distributions. Here we report a simplified approach, whereby on mixing two polymers (one of high D and one of low D), any intermediate dispersity value can be obtained (e.g. from 1.08 to 1.84). Unrivalled precision is achieved, with dispersity values obtained to even the nearest 0.01 (e.g. 1.37→1.38→1.39→1.40→1.41→1.42→1.43→1.44→1.45), while maintaining fairly monomodal mol. weight distributions. This approach was also employed to control the shape of mol. weight distributions and to obtain diblock copolymers with high dispersity accuracy. The straightforward nature of our methodol. alongside its compatibility with a wide range of polymerization protocols (e.g. ATRP, RAFT), significantly expands the toolbox of tailored polymeric materials and makes them accessible to all researchers. The experimental part of the paper was very detailed, including the reaction process of Cupric bromide(cas: 7789-45-9Synthetic Route 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.Synthetic Route of Br2Cu

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

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”