Day: October 19, 2022

Electric Literature of Br2CuIn 2019 ,《Influence of molecular weight on PNIPAM brush modified colloidal silica particles》 appeared in Soft Matter. The author of the article were Humphreys, Ben A.; Prescott, Stuart W.; Murdoch, Timothy J.; Nelson, Andrew; Gilbert, Elliot P.; Webber, Grant B.; Wanless, Erica J.. The article conveys some information:

The effect of mol. weight and temperature on the phase transition and internal structure of poly(N-isopropylacrylamide) brush modified colloidal silica particles was investigated using dynamic light scattering (DLS) and small angle neutron scattering (SANS) between 15 and 45°C. Dry particle anal. utilizing transmission electron microscopy (TEM), Fourier-transform IR spectroscopy (FTIR) and thermogravimetric anal. (TGA) all confirmed the thickness of the polymer brush shell increased as a function of polymerization time. Hydrodynamic diameter and electrophoretic mobility results revealed that the brush modified particles transitioned from swollen shells to a collapsed conformation between 15 and 35°C. The dispersions were electrosterically stabilized over the entire temperature range investigated, with minimal thermal hysteresis recorded. Modeling of the hydrodynamic diameter enabled the calculation of a lower critical solution temperature (LCST) which increased as a function of brush thickness. The internal structure determined via SANS showed a swollen brush at low temperatures (18 and 25°C) which decayed radially away from the substrate, while a collapsed block-like conformation with 60% polymer volume fraction was present at 40°C. Radial phase separation was evident at intermediate temperatures (30 and 32.5°C) with the lower mol. weight sample having a greater volume fraction of polymer in the dense inner region at these temperatures In addition to this study using Cupric bromide, there are many other studies that have used Cupric bromide(cas: 7789-45-9Electric Literature of Br2Cu) 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.Electric Literature of Br2Cu

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

In 2019,ACS Macro Letters included an article by Wang, Zongyu; Yan, Jiajun; Liu, Tong; Wei, Qiangbing; Li, Sipei; Olszewski, Mateusz; Wu, Jianing; Sobieski, Julian; Fantin, Marco; Bockstaller, Michael R.; Matyjaszewski, Krzysztof. Recommanded Product: Cupric bromide. The article was titled 《Control of Dispersity and Grafting Density of Particle Brushes by Variation of ATRP Catalyst Concentration》. The information in the text is summarized as follows:

Silica particles with grafted poly(Me methacrylate) brushes, SiO2-g-PMMA, were prepared via activator regeneration by electron transfer (ARGET) atom transfer radical polymerization (ATRP). The grafting d. and dispersity of the polymer brushes was tuned by the initial ATRP catalyst concentration ([CuII/L]0). Sparsely grafted particle brushes, which also displayed an anisotropic string-like structure in TEM images, were obtained at very low catalyst concentrations, [CuII/L]0 < 1 ppm. The effect of the initial catalyst concentration on dispersity and initiation efficiency in the particle brush system was similar to that observed in the synthesis of linear PMMA homopolymers. The kinetic study revealed a transition from controlled radical polymerization to a less controlled process at low monomer conversion, when the [CuII/L]0 decreased below about 10 ppm. In the experimental materials used by the author, we found Cupric bromide(cas: 7789-45-9Recommanded Product: 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.Recommanded Product: Cupric bromide

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

《Isolation of extracellular vesicles from intestinal tissue in a mouse model of intestinal ischemia/reperfusion injury》 was written by Chen, Xiao-Dong; Zhao, Jin; Yan, Zhengzheng; Zhou, Bo-Wei; Huang, Wen-Fang; Liu, Wei-Feng; Li, Cai; Liu, Ke-Xuan. HPLC of Formula: 13395-16-9 And the article was included in BioTechniques in 2020. The article conveys some information:

Extracellular vesicles (EVs) are small membranous particles that contribute to intercellular communications. Separating EVs from tissue is still a tech. challenge. Here, we present a rigorous method for extracting EVs from intestinal tissue in a mouse intestinal ischemia/reperfusion (I/R) model, and for analyzing their miRNA content. The isolated EVs show a typical cup shape with a size peak of 120-130 nm in diameter, confirmed by TEM and NTA. They also express EV markers such as CD9, CD63, CD81, Tsg101 and Alix. Real-time qPCR confirmed that these pellets contain miRNAs related to I/R injury. Our study presents a practical way to isolate EVs from intestinal tissue which is suitable for downstream applications such as miRNA anal., and provides a novel method for investigating the mechanism of intestinal I/R injury. METHOD SUMMARY : We present a practical way to isolate EVs from intestinal tissue; the method consists of enzymic digestion, differential centrifugation and d. gradient centrifugation. This method is suitable for downstream studies such as miRNA anal. After reading the article, we found that the author used Bis(acetylacetone)copper(cas: 13395-16-9HPLC of Formula: 13395-16-9)

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.HPLC of Formula: 13395-16-9

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

Related Products of 7789-45-9In 2021 ,《A Schiff base ligand for photoinduced atom transfer radical polymerization》 was published in Polymer Chemistry. The article was written by Xu, Xiaoling; Hong, Mei; Bao, Chunyang; Wang, Yan; Chen, Jing; Li, Die; Wang, Tianheng; Zhang, Qiang. The article contains the following contents:

A claw-type Schiff base, tris[N-(2-pyridylmethyl)-2-iminoethyl]amine (Py3Tren), is used as an active ligand for photoinduced atom transfer radical polymerization (Photo-ATRP). CuBr2/Py3Tren was employed as a catalyst for Photo-ATRP of Me methacrylate (MMA) under the irradiation of UV or visible light. Well-defined poly(MMA) could be synthesized with high chain-end functionality confirmed by in situ chain extension. Temporal control of Photo-ATRP was successfully demonstrated by switching the light on and off. The polymerization mechanism was finally discussed through UV/vis spectroscopy and electrospray ionization mass spectrometry experimentsCupric bromide(cas: 7789-45-9Related Products 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.Related Products of 7789-45-9

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

Quality Control of Cupric bromideIn 2019 ,《Translating Surface-Initiated Atom Transfer Radical Polymerization into Technology: The Mechanism of Cu0-Mediated SI-ATRP under Environmental Conditions》 was published in ACS Macro Letters. The article was written by Yan, Wenqing; Fantin, Marco; Spencer, Nicholas D.; Matyjaszewski, Krzysztof; Benetti, Edmondo M.. The article contains the following contents:

The exceptional features of Cu0-mediated surface-initiated atom transfer radical polymerization (Cu0 SI-ATRP), and its potential for implementation in technol. relevant surface functionalizations are demonstrated thanks to a comprehensive understanding of its mechanism. Cu0 SI-ATRP enables the synthesis of multifunctional polymer brushes with a remarkable degree of control, over extremely large areas and without the need for inert atm. or deoxygenation of monomer solutions When a polymerization mixture is placed between a flat copper plate and an ATRP-initiator-functionalized substrate, the vertical distance between these two overlaying surfaces determines the tolerance of the grafting process toward the oxygen, while the composition of the polymerization solution emerges as the critical parameter regulating polymer-grafting kinetics. At very small distances between the copper plate and the initiating surfaces, the oxygen dissolved in the solution is rapidly consumed via oxidation of the metallic substrate. In the presence of ligand, copper species diffuse to the surface-immobilized initiators and trigger a rapid growth of polymer brushes. Concurrently, the presence and concentration of added CuII regulates the generation of CuI-based activators through comproportionation with Cu0. Hence, under oxygen-tolerant conditions, the extent of comproportionation, together with the solvent-dependent rate constant of activation (kact) of ATRP are the main determinants of the growth rate of polymer brushes. The results came from multiple reactions, including the reaction of Cupric bromide(cas: 7789-45-9Quality Control 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.Quality Control of Cupric bromide

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

《A tripodal heptadentate Schiff base as an active ligand for atom transfer radical polymerization》 was written by Xu, Xiaoling; Bao, Chunyang; Hong, Mei; Li, Die; Zhang, Qiang. Reference of Cupric bromideThis research focused ontrispyridylmethyl iminoethylamine Schiff base catalyst methyl methacrylate polymerization. The article conveys some information:

The use of a tripodal heptadentate Schiff base, tris[N-(2-pyridylmethyl)-2-iminoethyl]amine (Py3Tren), as an active ligand for atom transfer radical polymerization (ATRP) is reported. The coordination between Py3Tren and CuBr2 in solution is investigated by electrospray ionization mass spectrometry, which reveals the generation of a tripod claw-shaped complex by using equimolar quantities of CuBr2 and Py3Tren. Electrochem. studies of CuBr2/Py3Tren complexes demonstrate more neg. redox potentials and higher activities compared with those of bidentate CuBr2/N-ethyl-2-pyridylmethanimine (PyEthyl) complexes. Subsequently, CuBr/Py3Tren is employed as a catalyst for the normal ATRP of Me methacrylate (MMA). Well-defined poly(MMA) with controlled mol. weight and narrow polydispersity could be synthesized with high conversions and fast rates even at ambient temperature (30°C). Activators regenerated by electron transfer (ARGET) ATRP and supplemental activators and reducing agents (SARA) ATRP of acrylate monomers using Py3Tren as the ligand are also performed to reduce the amounts of metal catalysts for polymerizations The results came from multiple reactions, including the reaction of Cupric bromide(cas: 7789-45-9Reference 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.Reference of Cupric bromide

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

《Tunable Assembly of Block Copolymer Tethered Particle Brushes by Surface-Initiated Atom Transfer Radical Polymerization》 was written by Wang, Zongyu; Lee, Jaejun; Wang, Zhenhua; Zhao, Yuqi; Yan, Jiajun; Lin, Yu; Li, Sipei; Liu, Tong; Olszewski, Mateusz; Pietrasik, Joanna; Bockstaller, Michael R.; Matyjaszewski, Krzysztof. Application In Synthesis of Cupric bromideThis research focused ontunable assembly block polystyrene polymethacrylate silica brush ATRP. The article conveys some information:

A strategy to synthesize SiO2-g-PMMA/PMMA-b-PS mono- and bimodal block copolymer particle brushes by surface-initiated atom transfer radical polymerization (SI-ATRP) from silica particles is presented. First, PMMA blocks were prepared by normal ATRP with controlled degree of polymerizations and grafting d. In a second step, the PS block was synthesized through a chain extension using low ppm of Cu catalyst. Variation of the SiO2-g-PMMA-Br macroinitiator concentration had a pronounced effect on the modality of the chain extension product. In the limit of small concentration, partial termination resulted in bimodal brush architectures, while more uniform brush architectures were observed with increasing concentration of macroinitiator. Brush nanoparticles with bimodal architectures assembled into string-like aggregates that bore a resemblance to structures found in systems comprised of sparse (homopolymer) brush particles. The unexpected effect of modality on structure formation points to opportunities in controlling microstructures in brush particle materials. The results came from multiple reactions, including the reaction of Cupric bromide(cas: 7789-45-9Application In Synthesis 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.Application In Synthesis of Cupric bromide

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

In 2019,ACS Macro Letters included an article by Wang, Zhenhua; Lorandi, Francesca; Fantin, Marco; Wang, Zongyu; Yan, Jiajun; Wang, Zhanhua; Xia, Hesheng; Matyjaszewski, Krzysztof. SDS of cas: 7789-45-9. The article was titled 《Atom Transfer Radical Polymerization Enabled by Sonochemically Labile Cu-carbonate Species》. The information in the text is summarized as follows:

Atom transfer radical polymerization (ATRP) has been previously mediated by ultrasound using a low concentration of copper complex in water (sono-ATRP) or by addition of piezoelec. materials in organic solvents (mechano-ATRP). However, these procedures proceeded slowly and yielded polymers contaminated by new chains initiated by hydroxyl radicals or by residual piezoelecs. Unexpectedly, in the presence of sodium carbonate, rapid sono-ATRP of Me acrylate in DMSO was achieved (80% conversion in <2 h) with excellent control of mol. weights and low dispersities (Mw/Mn < 1.2). The in situ formed CuII/L-CO3 complex in the presence of ultrasound generated CuI/L species as activators for ATRP and carbonate radical anions. The latter were scavenged by DMSO that was oxidized to di-Me sulfone. This simple and robust process employs low-intensity ultrasound, air-stable CuII/L catalysts, and carbonate or bicarbonate salts (washing soda or baking soda) to prepare well-defined polyacrylates. The experimental part of the paper was very detailed, including the reaction process of Cupric bromide(cas: 7789-45-9SDS of cas: 7789-45-9)

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.SDS of cas: 7789-45-9

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

Kahnt, Maik; Grote, Lukas; Brueckner, Dennis; Seyrich, Martin; Wittwer, Felix; Koziej, Dorota; Schroer, Christian G. published their research in Scientific Reports in 2021. The article was titled 《Multi-slice ptychography enables high-resolution measurements in extended chemical reactors》.Reference of Bis(acetylacetone)copper The article contains the following contents:

Ptychog. X-ray microscopy is an ideal tool to observe chem. processes under in situ conditions. Chem. reactors, however, are often thicker than the depth of field, limiting the lateral spatial resolution in projection images. To overcome this limit and reach higher lateral spatial resolution, wave propagation within the sample environment has to be taken into account. Here, we demonstrate this effect recording a ptychog. projection of copper(I) oxide nanocubes grown on two sides of a polyimide foil. Reconstructing the nanocubes using the conventional ptychog. model shows the limitation in the achieved resolution due to the thickness of the foil. Whereas, utilizing a multi-slice approach unambiguously separates two sharper reconstructions of nanocubes on both sides of the foil. Moreover, we illustrate how ptychog. multi-slice reconstructions are crucial for high-quality imaging of chem. processes by ex situ studying copper(I) oxide nanocubes grown on the walls of a liquid cell. In the experiment, the researchers used Bis(acetylacetone)copper(cas: 13395-16-9Reference of Bis(acetylacetone)copper)

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.Reference of Bis(acetylacetone)copper

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

In 2022,Drosou, Maria; Mitsopoulou, Christiana A.; Orio, Maylis; Pantazis, Dimitrios A. published an article in Magnetochemistry. The title of the article was 《EPR Spectroscopy of Cu(II) Complexes: Prediction of g-Tensors Using Double-Hybrid Density Functional Theory》.HPLC of Formula: 13395-16-9 The author mentioned the following in the article:

Computational ESR (EPR) spectroscopy is an important field of applied quantum chem. that contributes greatly to connecting spectroscopic observations with the fundamental description of electronic structure for open-shell mols. However, not all EPR parameters can be predicted accurately and reliably for all chem. systems. Among transition metal ions, Cu(II) centers in inorganic chem. and biol., and their associated EPR properties such as hyperfine coupling and g-tensors, pose exceptional difficulties for all levels of quantum chem. In the present work, we approach the problem of Cu(II) g-tensor calculations using double-hybrid d. functional theory (DHDFT). Using a reference set of 18 structurally and spectroscopically characterized Cu(II) complexes, we evaluate a wide range of modern double-hybrid d. functionals (DHDFs) that have not been applied previously to this problem. Our results suggest that the current generation of DHDFs consistently and systematically outperform other computational approaches. The B2GP-PLYP and PBE0-DH functionals are singled out as the best DHDFs on average for the prediction of Cu(II) g-tensors. The performance of the different functionals is discussed and suggestions are made for practical applications and future methodol. developments. The experimental part of the paper was very detailed, including the reaction process of Bis(acetylacetone)copper(cas: 13395-16-9HPLC of Formula: 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. HPLC of Formula: 13395-16-9

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