Indenyl-Nickel Complexes Bearing a Pendant, Hemilabile Olefin Ligand:  Preparation, Characterization, and Catalytic Activities

2005 ◽  
Vol 24 (16) ◽  
pp. 4003-4013 ◽  
Author(s):  
Daniel Gareau ◽  
Christine Sui-Seng ◽  
Laurent F. Groux ◽  
François Brisse ◽  
Davit Zargarian
Keyword(s):  
Nickel Complexes ◽  
Catalytic Activities

Photocatalytic and electrocatalytic hydrogen production using nickel complexes supported by hemilabile and non-innocent ligands

2020 ◽  
Vol 56 (19) ◽  
pp. 2829-2832 ◽  
Author(s):  
Satoshi Inoue ◽  
Yin-Nan Yan ◽  
Katsunori Yamanishi ◽  
Yusuke Kataoka ◽  
Tatsuya Kawamoto
Keyword(s):  
Electron Transfer ◽  
Schiff Base ◽  
Hydrogen Production ◽  
Nickel Complexes ◽  
Schiff Base Ligands ◽  
Catalytic Activities ◽  
Proton Coupled Electron Transfer ◽  
Square Planar ◽  
Electron Reduction

Square-planar Ni complexes with non-innocent ligands generated by one-electron reduction of octahedral Ni(ii) complexes with Schiff base ligands exhibited excellent catalytic activities via proton-coupled electron transfer for the H2 evolution reaction.

scholarly journals Rhodium, iridium and nickel complexes with a 1,3,5-triphenylbenzene tris-MIC ligand. Study of the electronic properties and catalytic activities

2015 ◽  
Vol 11 ◽  
pp. 2584-2590 ◽  
Author(s):  
Carmen Mejuto ◽  
Beatriz Royo ◽  
Gregorio Guisado-Barrios ◽  
Eduardo Peris
Keyword(s):  
Cyclic Voltammetry ◽  
Electronic Properties ◽  
Addition Reaction ◽  
Nickel Complexes ◽  
Rhodium Complex ◽  
Iridium Complexes ◽  
Nickel Compound ◽  
Unsaturated Ketones ◽  
Arylboronic Acids ◽  
Catalytic Activities

The coordination versatility of a 1,3,5-triphenylbenzene-tris-mesoionic carbene ligand is illustrated by the preparation of complexes with three different metals: rhodium, iridium and nickel. The rhodium and iridium complexes contained the [MCl(COD)] fragments, while the nickel compound contained [NiCpCl]. The preparation of the tris-MIC (MIC = mesoionic carbene) complex with three [IrCl(CO)2] fragments, allowed the estimation of the Tolman electronic parameter (TEP) for the ligand, which was compared with the TEP value for a related 1,3,5-triphenylbenzene-tris-NHC ligand. The electronic properties of the tris-MIC ligand were studied by cyclic voltammetry measurements. In all cases, the tris-MIC ligand showed a stronger electron-donating character than the corresponding NHC-based ligands. The catalytic activity of the tri-rhodium complex was tested in the addition reaction of arylboronic acids to α,β-unsaturated ketones.

Unveiling the Urease Like Intrinsic Catalytic Activities of Two Dinuclear Nickel Complexes towards in-situ Syntheses of Aminocyanopyridines

2021 ◽  
Author(s):  
Suman Mukhopadhyay ◽  
BIDYUT KUMAR KUNDU ◽  
Pragti Porwal ◽  
Soumen Biswas ◽  
Abhijit Mondal ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Catalytic Reaction ◽  
Nickel Complexes ◽  
Bioinorganic Chemistry ◽  
Organic P ◽  
Catalytic Activities ◽  
Functional Models

Designing metal complexes as functional models for metalloenzymes remains one of the main targets in synthetic bioinorganic chemistry. Furthermore, utilization of the product(s) derived from catalytic reaction for subsequent organic...

α-Diimine nickel complexes bearing axially bulky terphenyl and equatorially bulky dibenzobarrelene groups: synthesis, characterization and olefin polymerization studies

2020 ◽  
Vol 11 (42) ◽  
pp. 6783-6793
Author(s):  
Xiaohua Wang ◽  
Bo Dong ◽  
Qi Yang ◽  
Heng Liu ◽  
Chunyu Zhang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ethylene Polymerization ◽  
Olefin Polymerization ◽  
Nickel Complexes ◽  
Catalytic Activities ◽  
New Family ◽  
Ultra High Molecular Weight

A new family of asymmetric α-diimine nickel complexes bearing axially and equatorially bulky groups were synthesized successfully. They exhibited high catalytic activities for ethylene polymerization and afforded ultra-high-molecular-weight elastomeric polyethylenes.

scholarly journals Ligand steric effects on α-diimine nickel catalyzed ethylene and 1-hexene polymerization

RSC Advances ◽  
2017 ◽  
Vol 7 (87) ◽  
pp. 55051-55059 ◽  
Author(s):  
Jinlong Sun ◽  
Fuzhou Wang ◽  
Weimin Li ◽  
Min Chen
Keyword(s):  
Nickel Complexes ◽  
Steric Effects ◽  
Catalytic Activities ◽  
Molecular Weights ◽  
Wide Range

α-Diimine nickel complexes with systematically varied ligand sterics were used as a precatalyst for ethylene and 1-hexene polymerizations. The catalytic activities, molecular weights and branching densities could be tuned over a very wide range.

2-(1H-2-Benzimidazolyl)-6-(1-(arylimino)ethyl)pyridylnickel Complexes: Synthesis, Characterization, and Ethylene Oligomerization

2010 ◽  
Vol 63 (1) ◽  
pp. 109 ◽  
Author(s):  
Liwei Xiao ◽  
Min Zhang ◽  
Rong Gao ◽  
Xiaoping Cao ◽  
Wen-Hua Sun
Keyword(s):  
Spectroscopic Analysis ◽  
Nickel Complexes ◽  
Molecular Structures ◽  
Ethylene Oligomerization ◽  
Distorted Octahedral Geometry ◽  
Electronic Effects ◽  
Single Crystal Diffraction ◽  
Catalytic Activities ◽  
Distorted Octahedral ◽  
Ir Spectroscopic

A series of tridentate N,N,N-nickel complexes bearing 2-(1H-2-benzimidazolyl)-6-(1-(arylimino)ethyl)pyridines was synthesized and characterized by elemental and IR spectroscopic analysis. The molecular structures of representative complexes were determined by single-crystal diffraction, and these were found to have a six-coordinate distorted octahedral geometry around the Ni centre. On treatment with Et2AlCl, all nickel complexes exhibited good catalytic activities up to 106 g mol–1(Ni) h–1 for ethylene oligomerization with major dimerization. The steric and electronic effects on catalytic activities of metal complexes as well as the influence of various reaction parameters were carefully investigated.

Photocatalytic activity of TiO2 synthesized by anodization and anodic spark deposition

MRS Advances ◽  
2020 ◽  
Vol 5 (61) ◽  
pp. 3141-3152
Author(s):  
Alma C. Chávez-Mejía ◽  
Génesis Villegas-Suárez ◽  
Paloma I. Zaragoza-Sánchez ◽  
Rafael Magaña-López ◽  
Julio C. Morales-Mejía ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Surface Characteristics ◽  
Amorphous Solids ◽  
X Ray Diffraction ◽  
X Ray ◽  
Catalytic Activities ◽  
Anodic Spark Oxidation ◽  
Porous Surfaces ◽  
Scanning Electron

AbstractSeveral photocatalysts, based on titanium dioxide, were synthesized by spark anodization techniques and anodic spark oxidation. Photocatalytic activity was determined by methylene blue oxidation and the catalytic activities of the catalysts were evaluated after 70 hours of reaction. Scanning Electron Microscopy and X Ray Diffraction analysis were used to characterize the catalysts. The photocatalyst prepared with a solution of sulfuric acid and 100 V presented the best performance in terms of oxidation of the dye (62%). The electric potential during the synthesis (10 V, low potential; 100 V, high potential) affected the surface characteristics: under low potential, catalyst presented smooth and homogeneous surfaces with spots (high TiO2 concentration) of amorphous solids; under low potential, catalyst presented porous surfaces with crystalline solids homogeneously distributed.

Spatiotemporal Control of Amide Radicals During Photocatalysis

2020 ◽  
Author(s):  
Shogo Mori ◽  
Takahiro Aoki ◽  
Kaliyamoorthy Selvam ◽  
Shunichi Fukuzumi ◽  
Jieun Jung ◽  
...  
Keyword(s):  
Organic Synthesis ◽  
Nickel Complex ◽  
Nickel Complexes ◽  
Semiconductor Material ◽  
Radical Reactions ◽  
Substitution Reactions ◽  
Carbon Neutrality ◽  
Spatiotemporal Control ◽  
Scalable Production ◽  
Salt Waste

Despite the continuing popularity of radical reactions in organic synthesis, much remains to be explored in this area. Herein, we describe how spatiotemporal control can be exerted over the formation and reactivity of divergent exchangeable formamide radicals using nickel complexes with a semiconductor material (TiO<sub>2</sub>) under irradiation from near-UV–Vis light. Depending on the bipyridine ligand used and the quantity of the nickel complex that is hybridized on or nonhydridized over the TiO<sub>2</sub> surface, these radicals selectively undergo substitution reactions at the carbon center of carbon–bromine bonds that proceed via three different pathways. As the scalable production of formamides from CO<sub>2</sub> does not produce salt waste, these methods could add a new dimension to the search for carbon neutrality through the indirect incorporation of CO<sub>2</sub> into organic frameworks.

Metal-Assisted Plasma Etching of Silicon: A Liquid-Free Alternative to MACE

2018 ◽  
Author(s):  
Julia Sun ◽  
Benjamin Almquist
Keyword(s):  
Liquid Phase ◽  
Plasma Etching ◽  
Chemical Etching ◽  
Gold Films ◽  
Metallic Films ◽  
Au Catalyst ◽  
Feed Concentration ◽  
Catalytic Activities ◽  
Metal Assisted Chemical Etching ◽  
Complex Nanostructures

For decades, fabrication of semiconductor devices has utilized well-established etching techniques to create complex nanostructures in silicon. Of these, two of the most common are reactive ion etching in the gaseous phase and metal-assisted chemical etching (MACE) in the liquid phase. Though these two methods are highly established and characterized, there is a surprising scarcity of reports exploring the ability of metallic films to catalytically enhance the etching of silicon in dry plasmas via a MACE-like mechanism. Here, we discuss a <u>m</u>etal-<u>a</u>ssisted <u>p</u>lasma <u>e</u>tch (MAPE) performed using patterned gold films to catalyze the etching of silicon in an SF<sub>6</sub>/O<sub>2</sub> mixed plasma, selectively increasing the rate of etching by over 1000%. The degree of enhancement as a function of Au catalyst configuration and relative oxygen feed concentration is characterized, along with the catalytic activities of other common MACE metals including Ag, Pt, and Cu. Finally, methods of controlling the etch process are briefly explored to demonstrate the potential for use as a liquid-free fabrication strategy.

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