Organic Ligand‐Free Hydroformylation with Rh Particles as Catalyst †

2019 ◽  
Vol 38 (2) ◽  
pp. 139-143 ◽  
Author(s):  
Shujuan Liu ◽  
Xingchao Dai ◽  
Hongli Wang ◽  
Xinzhi Wang ◽  
Feng Shi
Keyword(s):  
Organic Ligand ◽  
Ligand Free

scholarly journals A mild aqueous synthesis of ligand-free copper nanoparticles for low temperature sintering nanopastes with nickel salt assistance

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hiroshi Imamura ◽  
Yoichi Kamikoriyama ◽  
Atsushi Muramatsu ◽  
Kiyoshi Kanie
Keyword(s):  
Low Temperature ◽  
Organic Ligand ◽  
Particle Diameter ◽  
Nitrogen Atmosphere ◽  
Nickel Salt ◽  
Low Temperature Sintering ◽  
Resource Saving ◽  
Aqueous Synthesis ◽  
Ligand Free ◽  
Sintering Properties

AbstractAn organic ligand-free aqueous-phase synthesis of copper (Cu) nanoparticles (NPs) under an air atmosphere was successfully achieved by reducing copper(II) oxide particles with a leaf-like shape in the presence of Ni salts at room temperature. The resulting Cu NPs with a mean particle diameter of ca. 150 nm exhibited low-temperature sintering properties due to their polycrystalline internal structure and ligand-free surface. These Cu NPs were applied to obtain Cu NP-based nanopastes with low-temperature sintering properties, and the resistivities of the obtained Cu electrodes after annealing at 150 °C and 200 °C for 30 min were 64 μΩ∙cm and 27 μΩ∙cm, respectively. The bonding strength between oxygen-free Cu plates prepared using the Cu NP-based nanopastes reached 32 MPa after pressure-less sintering at 260 °C for 30 min under a nitrogen atmosphere. The developed manufacturing processes using the developed Cu nanopastes could provide sustainable and low-CO2-emission approaches to obtain Cu electrodes on flexible films and high-strength bonding between metal plates as die-attach materials for power devices under energy- and resource-saving conditions.

[Bmmim]6[In10Se16Cl4]·(MIm)2: an organic-ligand free discrete T3 cluster for efficient hydrogen evolution under visible light irradiation

2020 ◽  
Vol 49 (16) ◽  
pp. 5020-5023 ◽  
Author(s):  
Yanqi Wang ◽  
Qianqian Hu ◽  
Jiance Jin ◽  
Jilong Li ◽  
Jianrong Li ◽  
...  
Keyword(s):  
Solid State ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Organic Ligand ◽  
Light Irradiation ◽  
Photocatalytic Hydrogen Evolution ◽  
Ligand Free

An organic-ligand free selenide T3 cluster exhibits a much higher photocatalytic hydrogen evolution activity after being stably dispersed in a solvent (6.5 times) than that in the solid state.

Zeolite catalyzed hydroarylation of alkenes with aromatic amines under organic ligand-free conditions

2021 ◽  
Vol 394 ◽  
pp. 18-29
Author(s):  
Xinzhi Wang ◽  
Hongli Wang ◽  
Kang Zhao ◽  
Teng Li ◽  
Shujuan Liu ◽  
...  
Keyword(s):  
Aromatic Amines ◽  
Organic Ligand ◽  
Ligand Free

Organic ligand-free PtIr alloy nanostructures for superior oxygen reduction and evolution reactions

2019 ◽  
Vol 77 ◽  
pp. 105-110 ◽  
Author(s):  
Jin-Young Park ◽  
Hyun-Suk Park ◽  
Sang-Beom Han ◽  
Da-Hee Kwak ◽  
Ji-Eun Won ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Organic Ligand ◽  
Ligand Free ◽  
Alloy Nanostructures

scholarly journals Improvement of Ligand-Free Modification Strategy: How to Obtain Water-Stable Up-Converting Nanoparticles With Bright Emission and High Reaction Yield?

2021 ◽  
Author(s):  
Natalia Jurga ◽  
Dominika Przybylska ◽  
Piotr Kamiński ◽  
Tomasz Grzyb
Keyword(s):  
Organic Ligand ◽  
Reaction Yield ◽  
Water Dispersible ◽  
Two Photon ◽  
High Reaction ◽  
Photon Excitation ◽  
Effective Energy Transfer ◽  
Ligand Free ◽  
Modification Procedure ◽  
High Boiling Point

Abstract Water-dispersible up-converting nanoparticles (UCNPs) are known to be very effective in biomedical applications. Research groups have paid special attention to the synthesis of hydrophilic UCNPs with good physicochemical properties. Being aware of this, we decided to improve the ligand-free modification method of OA-capped NaYF4:Yb3+,Er3+/NaYF4 UCNPs prepared by precipitation in high-boiling-point solvents as the thus-far reported methods do not provide satisfactory results. Different molarities of hydrochloric acid and various mixing times were selected to remove the organic ligand from the NPs’ surface and to discover the most promising modification approach. Highly water-stable colloids were obtained with a very high reaction yield of up to 96%. Moreover, the acid treatment did not affect the morphology and the size of the product. All of the crystals exhibited a bright up-conversion emission under 975-nm excitation, which confirmed the two-photon excitation and effective energy transfer between the used dopant ions. Thus, we could establish the most successful ligand-free modification procedure.

scholarly journals Supported sub-nanometer Ta oxide clusters as model catalysts for the selective epoxidation of cyclooctene

2018 ◽  
Vol 42 (4) ◽  
pp. 3035-3041 ◽  
Author(s):  
G. Zwaschka ◽  
M. Rondelli ◽  
M. Krause ◽  
M. D. Rötzer ◽  
M. N. Hedhili ◽  
...  
Keyword(s):  
High Vacuum ◽  
Tantalum Oxide ◽  
Organic Ligand ◽  
Model Catalysts ◽  
Ultra High Vacuum ◽  
Ligand Free ◽  
Catalytically Active ◽  
Oxidation In Air ◽  
Small Clusters

The preparation of organic ligand-free, isolated and catalytically active tantalum oxide complexes (Ta1) and small clusters (Tan>1) on flat silicate support was accomplished by ultra-high vacuum (UHV) techniques followed by oxidation in air.

scholarly journals Improvement of ligand-free modification strategy to obtain water-stable up-converting nanoparticles with bright emission and high reaction yield

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Natalia Jurga ◽  
Dominika Przybylska ◽  
Piotr Kamiński ◽  
Tomasz Grzyb
Keyword(s):  
Organic Ligand ◽  
Reaction Yield ◽  
Water Dispersible ◽  
Two Photon ◽  
High Reaction ◽  
Photon Excitation ◽  
Effective Energy Transfer ◽  
Ligand Free ◽  
Modification Procedure ◽  
High Boiling Point

AbstractWater-dispersible up-converting nanoparticles (UCNPs) are known to be very effective in biomedical applications. Research groups have paid special attention to the synthesis of hydrophilic UCNPs with good physicochemical properties. Being aware of this, we decided to improve the ligand-free modification method of OA-capped NaYF4:Yb3+,Er3+/NaYF4 UCNPs prepared by precipitation in high-boiling-point solvents as the thus-far reported methods do not provide satisfactory results. Different molarities of hydrochloric acid and various mixing times were selected to remove the organic ligand from the NPs’ surface and to discover the most promising modification approach. Highly water-stable colloids were obtained with a very high reaction yield of up to 96%. Moreover, the acid treatment did not affect the morphology and the size of the product. All of the crystals exhibited a bright up-conversion emission under 975-nm excitation, which confirmed the two-photon excitation and effective energy transfer between the used dopant ions. Thus, we could establish the most successful ligand-free modification procedure.

An organic-ligand-free thermochromic luminescent cuprous iodide trinuclear cluster: evidence for cluster centered emission and configuration distortion with temperature

2015 ◽  
Vol 51 (38) ◽  
pp. 8062-8065 ◽  
Author(s):  
Shi-Li Li ◽  
Fu-Qiang Zhang ◽  
Xian-Ming Zhang
Keyword(s):  
Organic Ligand ◽  
Structural Distortion ◽  
Temperature Dependent ◽  
Trinuclear Cluster ◽  
Ligand Free ◽  
Significant Temperature ◽  
Single Cluster

An organic-ligand-free cuprous iodide trinuclear cluster with significant temperature-dependent structural distortion shows thermochromic luminescence originating from a single cluster-centered triplet.

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