Phosphine ligand-coated Cu nanoparticle-catalyzed selective semihydrogenation of alkynes: electronic or hindrance effects of the ligand?

2020 ◽  
Vol 22 (29) ◽  
pp. 16905-16913
Author(s):  
Yafei Luo ◽  
Zheng Huang ◽  
Zhongzhu Chen ◽  
Zhigang Xu ◽  
Jianping Hu ◽  
...  
Keyword(s):  
Phosphine Ligand ◽  
Phosphine Ligands ◽  
Cu Nanoparticles ◽  
Cu Nanoparticle

The alkyne semihydrogenation catalyzed via phosphine ligands-coated Cu nanoparticles is explored in detail. The results indicate that the hindrance effect of ligand is favorable for improving the semihydrogenation selectivity of catalyst.

Ambient atmosphere-processable, printable Cu electrodes for flexible device applications: structural welding on a millisecond timescale of surface oxide-free Cu nanoparticles

Nanoscale ◽  
2015 ◽  
Vol 7 (9) ◽  
pp. 3997-4004 ◽  
Author(s):  
Sang-Jin Oh ◽  
Yejin Jo ◽  
Eun Jung Lee ◽  
Sun Sook Lee ◽  
Young Hun Kang ◽  
...  
Keyword(s):  
Surface Oxide ◽  
Ambient Atmosphere ◽  
Cu Nanoparticles ◽  
Flexible Device ◽  
Device Applications ◽  
Cu Nanoparticle ◽  
Paper Substrates

We demonstrate Cu nanoparticle-derived printed conductive structures on plastic and paper substrates in air.

scholarly journals A new class of platinum(ii) complexes with the phosphine ligand pta which show potent anticancer activity

2018 ◽  
Vol 5 (1) ◽  
pp. 39-53 ◽  
Author(s):  
M. D. Živković ◽  
J. Kljun ◽  
T. Ilic-Tomic ◽  
A. Pavic ◽  
A. Veselinović ◽  
...  
Keyword(s):  
Anticancer Activity ◽  
Phosphine Ligand ◽  
Phosphine Ligands ◽  
New Class

A series of 16 Pt(ii) complexes with 8-hydroxyquinolines and sulfoxide/phosphine ligands were synthetized, characterized and evaluated for cytotoxic and embryotoxic activity.

Molecular Dynamics Simulations of Diffusion of O2 and N2 Penetrants in Polydimethylsiloxane-Based Nanocomposites

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Douglas E. Spearot ◽  
Alex Sudibjo ◽  
Varun Ullal ◽  
Adam Huang
Keyword(s):  
Molecular Dynamics ◽  
Polymer Composites ◽  
Diffusion Coefficients ◽  
Metal Particle ◽  
Interatomic Potential ◽  
Md Simulations ◽  
Coarse Grained ◽  
Cu Nanoparticles ◽  
Cu Nanoparticle ◽  
Nanoparticle Inclusions

Recently, metal particle polymer composites have been proposed as sensing materials for micro corrosion sensors. To design the sensors, a detailed understanding of diffusion through metal particle polymer composites is necessary. Accordingly, in this work molecular dynamics (MD) simulations are used to study the diffusion of O2 and N2 penetrants in metal particle polymer nanocomposites composed of an uncross-linked polydimethylsiloxane (PDMS) matrix with Cu nanoparticle inclusions. PDMS is modeled using a hybrid interatomic potential with explicit treatment of Si and O atoms along the chain backbone and coarse-grained methyl side groups. In most models examined in this work, MD simulations show that diffusion coefficients of O2 and N2 molecules in PDMS-based nanocomposites are lower than that in pure PDMS. Nanoparticle inclusions act primarily as geometric obstacles for the diffusion of atmospheric penetrants, reducing the available porosity necessary for diffusion, with instances of O2 and N2 molecule trapping also observed at or near the PDMS/Cu nanoparticle interfaces. In models with the smallest gap between Cu nanoparticles, MD simulations show that O2 and N2 diffusion coefficients are higher than that in pure PDMS at the lowest temperatures studied. This is due to PDMS chain confinement at low temperatures in the presence of the Cu nanoparticles, which induces low-density regions within the PDMS matrix. MD simulations show that the role of temperature on diffusion can be modeled using the Williams–Landel–Ferry equation, with parameters influenced by nanoparticle content and spacing.

Synthese, Struktur und Reaktivität labiler Rhodium(I)-Komplexe mit iPr2PC2H4NMe2 und iPr2PC2H4OMe als Phosphanliganden / Synthesis, Structure and Reactivity of Labile Rhodium(I) Complexes Containing iPr2PC2H4NMe2 and iPr2PC2H4OMe as Phosphine Ligands

1990 ◽  
Vol 45 (11) ◽  
pp. 1548-1558 ◽  
Author(s):  
Helmut Werner ◽  
Andreas Hampp ◽  
Karl Peters ◽  
Eva Maria Peters ◽  
Leonhard Walz ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Chelate Ring ◽  
Parent Compound ◽  
Phosphine Ligand ◽  
Phosphine Ligands ◽  
X Ray ◽  
Vinylidene Complexes ◽  
Square Planar

Square-planar rhodium(I) complexes [RhCl(iPr2PC2H4Y)2] (8, 9) containing one chelating and one P-bonded monodentate phosphine ligand are prepared from [RhCl(C8H14)2]2 (7) and the new functionalized phosphines iPr2PC2H4Y (5,6). Reaction of 9 (Y = NMe2) with CO and of 8 (Y = OMe) with CO, C2H4, C2H2, C2Ph2 and HC2Ph leads to opening of the chelate ring and formation of the complexes trans-[RhCl(L)(η1-P–iPr2PC2H4Y)2] (10-15). Treatment of 8 with H2 gives the dihydridorhodium(III) compound [RhH2Cl(iPr2PC2H4OMe)2] (16). The vinylidene complexes trans-[RhCl(=C=CHR)(η1-P– iPr2PC2H4OMe)2] (17, 18) are obtained by thermal or pyridine promoted rearrangement of 13 (L = C2H2) and 15 (L = HC2Ph). 13 and 15 have also been used as starting materials for the synthesis of the cyclopentadienyl alkyne and vinylidene complexes 19-21. The X-ray crystal structure of the parent compound 8 was determined.

Characterization of sintered Cu nanopaste for micro-bumping with Injection Molded Solder technology

2020 ◽  
Vol 2020 (1) ◽  
pp. 000113-000118
Author(s):  
Eiji Nakamura ◽  
Toyohiro Aoki ◽  
Ryota Yamaguchi ◽  
Nobuhiro Sekine ◽  
Kuniaki Sueoka ◽  
...  
Keyword(s):  
Cross Sections ◽  
Molten Solder ◽  
The Novel ◽  
Cu Nanoparticles ◽  
Shear Testing ◽  
Injection Molded ◽  
Sintering Conditions ◽  
Cu Nanoparticle

Abstract We have previously developed a novel plating-free bumping process using Cu nanopaste and Injection Molded Solder (IMS) technology. In the present study, we investigated the further detail about the microstructural and mechanical properties of sintered Cu nanoparticles formed into a pillar shape. By analyzing cross-sections of Cu nanoparticle pillars sintered in various conditions, we clarified how the sintering conditions affect the microstructural features, including the size and numbers of Cu grains and voids inside sintered Cu nanoparticles. In addition, we conducted the shear testing for the obtained Cu pillars to evaluate relationships between the mechanical strength and the microstructural features. We found that the results of the shear testing were consistent with the microstructural features of the sintered Cu nanoparticles. Finally, we injected molten solder onto the Cu nanoparticle pillars to evaluate the overall feasibility of the developed process. It was confirmed that the molten solder injected by IMS process has good wettability against the sintered Cu nanoparticles, which resulted in the successful bump formation without solder missing. In addition, The IMC layer between the sintered Cu nanoparticles and injected solder was formed well. These results proved the quality of microbumps fabricated by the novel bumping process using Cu nanopaste and IMS.

scholarly journals Copper-catalyzed asymmetric methylation of fluoroalkylated pyruvates with dimethylzinc

2018 ◽  
Vol 14 ◽  
pp. 576-582 ◽  
Author(s):  
Kohsuke Aikawa ◽  
Kohei Yabuuchi ◽  
Kota Torii ◽  
Koichi Mikami
Keyword(s):  
Copper Catalyst ◽  
Phosphine Ligand ◽  
Phosphine Ligands ◽  
Tertiary Alcohols ◽  
Chiral Phosphine Ligands ◽  
Asymmetric Methylation ◽  
Chiral Phosphines ◽  
Catalytic Asymmetric ◽  
High Yields

The catalytic asymmetric methylation of fluoroalkylated pyruvates is shown with dimethylzinc as a methylating reagent in the presence of a copper catalyst bearing a chiral phosphine ligand. This is the first catalytic asymmetric methylation to synthesize various α-fluoroalkylated tertiary alcohols with CF3, CF2H, CF2Br, and n-C n F2 n +1 (n = 2, 3, 8) groups in good-to-high yields and enantioselectivities. Axial backbones and substituents on phosphorus atoms of chiral phosphine ligands critically influence the enantioselectivity. Moreover, the methylation of simple perfluoroalkylated ketones is found to be facilitated by only chiral phosphines without copper.

Photophysical properties of three coordinated copper(i) complexes bearing 1,10-phenanthroline and a monodentate phosphine ligand

2017 ◽  
Vol 46 (43) ◽  
pp. 14804-14811 ◽  
Author(s):  
Daichi Kakizoe ◽  
Michihiro Nishikawa ◽  
Yasuo Fujii ◽  
Taro Tsubomura
Keyword(s):  
Photophysical Properties ◽  
Phosphine Ligand ◽  
Phosphine Ligands ◽  
Strong Luminescence

Three-coordinated emissive copper(i) complexes bearing 1,10-phenanthroline and monodentate phosphine ligands were synthesized. Copper(i) complexes bearing a crowded phosphine ligand show relatively strong luminescence even in solution.

A highly conductive porous graphene electrode prepared via in situ reduction of graphene oxide using Cu nanoparticles for the fabrication of high performance supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (67) ◽  
pp. 54275-54282 ◽  
Author(s):  
Jizhen Zhang ◽  
Yuanhong Xu ◽  
Zhen Liu ◽  
Wenrong Yang ◽  
Jingquan Liu
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
In Situ Reduction ◽  
Cu Nanoparticles ◽  
Porous Graphene ◽  
Graphene Electrode ◽  
Cu Nanoparticle ◽  
Electrodes For Supercapacitors

A new graphene/Cu nanoparticle composite was prepared via the in situ reduction of GO in the presence of Cu nanoparticles which was then utilized as a sacrificing template for the formation of graphene electrodes for supercapacitors.

Integration of phosphine ligands and ionic liquids both in structure and properties – a new strategy for separation, recovery, and recycling of homogeneous catalyst

2019 ◽  
Vol 21 (13) ◽  
pp. 3583-3596 ◽  
Author(s):  
Xin Jin ◽  
Jianying Feng ◽  
Hongbing Song ◽  
Jiajun Yao ◽  
Qingqing Ma ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Phosphine Ligand ◽  
Phosphine Ligands ◽  
Homogeneous Catalyst ◽  
Structure And Properties ◽  
New Strategy

Integration of phosphine ligand and ionic liquid – a new strategy for separation, recovery, and recycling of homogeneous catalyst.

NHC-Catalyzed Synthesis of Benzazole-Phosphine Ligands under an Air Atmosphere

Synlett ◽  
2019 ◽  
Vol 30 (14) ◽  
pp. 1719-1724
Author(s):  
Wei Ren ◽  
Qian-Ming Zuo ◽  
Shang-Dong Yang
Keyword(s):  
Functional Group ◽  
Oxidative Cyclization ◽  
Phosphine Ligand ◽  
Phosphine Ligands ◽  
Cyclization Reaction ◽  
Atom Economy ◽  
Efficient Strategy ◽  
Air Atmosphere ◽  
Ligand Precursors ◽  
Ligand Synthesis

An efficient strategy for the synthesis of benzazole-phosphine ligand precursors via N-heterocyclic carbene catalyzed aerobic oxidative cyclization reaction has been performed. The reaction displays broad functional group tolerance and high atom economy, and the transformation has been further applied to benzazole-phosphine ligand synthesis.

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