Rapid and Efficient Collection of Platinum from Karstedt’s Catalyst Solution via Ligands-Exchange-Induced Assembly

2018 ◽  
Vol 10 (7) ◽  
pp. 6778-6784 ◽  
Author(s):  
Gonghua Yang ◽  
Yanlong Wei ◽  
Zhenzhu Huang ◽  
Jiwen Hu ◽  
Guojun Liu ◽  
...  
Keyword(s):  
Ligands Exchange

Synthesis of Organic–Inorganic Hybrid Nanocomposites via a Simple Two-Phase Ligands Exchange

2020 ◽  
Vol 12 (3) ◽  
pp. 326-332 ◽  
Author(s):  
Hyun Sung Noh ◽  
Jaehan Jung
Keyword(s):  
Ligand Exchange ◽  
Hybrid Nanocomposites ◽  
Azide Group ◽  
Two Phase ◽  
H Nmr ◽  
Bifunctional Ligands ◽  
Chemical Coupling ◽  
Inorganic Nanocomposites ◽  
Ligands Exchange ◽  
Click Coupling

The surface of nanocrystals (NCs) was precisely engineered with bifunctional ligands via a simple yet effective two-phase ligand exchange strategy where the introduction of bifunctional ligands and displacement of insulating aliphatic ligands are simultaneously occurred. This is advantageous compared to conventional ligands exchange procedure where the desired ligands are often introduced through two-step processes after treating NC surface with short mobile ligands such as pyridine or short amines. In this study, 4-azidobenzoic acid possessing carboxylic acid for binding with NCs and azide group for chemical coupling was utilized as bifunctional ligands. A correlation between the concentration and the efficiency of ligands replacement was corroborated by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (1H NMR) spectroscopy measurement. Lastly, organic–inorganic nanocomposites were crafted via click coupling between 1-octyne and azidobenzoic acid capped CdSe NCs. The success of coupling was substantiated by FTIR and 1H NMR.

scholarly journals Ligands Exchange, Studying the Stability and Optical Properties of CdSe/CdS/ZnS Quantum Dots with Liquid Crystal

2017 ◽  
Vol 917 ◽  
pp. 032026 ◽  
Author(s):  
A J Al-Alwani ◽  
A S Chumakov ◽  
M S Albermani ◽  
O A Shinkarenko ◽  
N N Begletsova ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Liquid Crystal ◽  
The Stability ◽  
Ligands Exchange

scholarly journals Ligands Exchange Process on Gold Nanoparticles in Acetone Solution

2018 ◽  
Vol 359 ◽  
pp. 012038
Author(s):  
C L Hu ◽  
Y Y Mu ◽  
Z C Bian ◽  
Z H Luo ◽  
K Luo ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Exchange Process ◽  
Acetone Solution ◽  
Ligands Exchange

Search of structure and ligands exchange for palladium(II) complexes with N-allylimidazole; X-ray and solid-state/solution NMR studies

2006 ◽  
Vol 691 (5) ◽  
pp. 869-878 ◽  
Author(s):  
Krystyna Kurdziel ◽  
Sebastian Olejniczak ◽  
Andrzej Okruszek ◽  
Tadeusz Głowiak ◽  
Rafał Kruszyński ◽  
...  
Keyword(s):  
Solid State ◽  
State Solution ◽  
Solution Nmr ◽  
Nmr Studies ◽  
X Ray ◽  
Ligands Exchange

Direct Visualization of Ligands Exchange on the Surfaces of Quantum Dots by a Two-Phase Approach

2018 ◽  
Vol 3 (8) ◽  
pp. 2267-2271
Author(s):  
Xiaobo Nie ◽  
Ying Zhang ◽  
Xiaojuan Wang ◽  
Chunguang Ren ◽  
Shu-Qin Gao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Direct Visualization ◽  
Two Phase ◽  
Phase Approach ◽  
Ligands Exchange

scholarly journals Tunnel engineering to accelerate product release for better biomass-degrading abilities in lignocellulolytic enzymes

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Zhenghui Lu ◽  
Xinzhi Li ◽  
Rui Zhang ◽  
Li Yi ◽  
Yanhe Ma ◽  
...  
Keyword(s):  
Active Sites ◽  
Specific Activity ◽  
Catalytic Efficiency ◽  
Functional Verification ◽  
Lignocellulolytic Enzymes ◽  
Glycosyl Hydrolases ◽  
Tunnel Engineering ◽  
Deconvolution Analysis ◽  
Engineering Strategy ◽  
Ligands Exchange

Abstract Background For enzymes with buried active sites, transporting substrates/products ligands between active sites and bulk solvent via access tunnels is a key step in the catalytic cycle of these enzymes. Thus, tunnel engineering is becoming a powerful strategy to refine the catalytic properties of these enzymes. The tunnel-like structures have been described in enzymes catalyzing bulky substrates like glycosyl hydrolases, while it is still uncertain whether these structures involved in ligands exchange. Till so far, no studies have been reported on the application of tunnel engineering strategy for optimizing properties of enzymes catalyzing biopolymers. Results In this study, xylanase S7-xyl (PDB: 2UWF) with a deep active cleft was chosen as a study model to evaluate the functionalities of tunnel-like structures on the properties of biopolymer-degrading enzymes. Three tunnel-like structures in S7-xyl were identified and simultaneously reshaped through multi-sites saturated mutagenesis; the most advantageous mutant 254RL1 (V207N/Q238S/W241R) exhibited 340% increase in specific activity compared to S7-xyl. Deconvolution analysis revealed that all three mutations contributed synergistically to the improved activity of 254RL1. Enzymatic characterization showed that larger end products were released in 254RL1, while substrate binding and structural stability were not changed. Dissection of the structural alterations revealed that both the tun_1 and tun_2 in 254RL1 have larger bottleneck radius and shorter length than those of S7-xyl, suggesting that these tunnel-like structures may function as products transportation pathways. Attributed to the improved catalytic efficiency, 254RL1 represents a superior accessory enzyme to enhance the hydrolysis efficiency of cellulase towards different pretreated lignocellulose materials. In addition, tunnel engineering strategy was also successfully applied to improve the catalytic activities of three other xylanases including xylanase NG27-xyl from Bacillus sp. strain NG-27, TSAA1-xyl from Geobacillus sp. TSAA1 and N165-xyl from Bacillus sp. N16-5, with 80%, 20% and 170% increase in specific activity, respectively. Conclusions This study represents a pilot study of engineering and functional verification of tunnel-like structures in enzymes catalyzing biopolymer. The specific activities of four xylanases with buried active sites were successfully improved by tunnel engineering. It is highly likely that tunnel reshaping can be used to engineer better biomass-degrading abilities in other lignocellulolytic enzymes with buried active sites.

Preparation of monodisperse CdTe nanocrystals-SiO2 microspheres without ligands exchange

2006 ◽  
Vol 280 (1-3) ◽  
pp. 169-176 ◽  
Author(s):  
Kun Han ◽  
Zheng Xiang ◽  
Zhihui Zhao ◽  
Chunlei Wang ◽  
Minjie Li ◽  
...  
Keyword(s):  
Cdte Nanocrystals ◽  
Sio2 Microspheres ◽  
Ligands Exchange

Structural control of Langmuir–Blodgett films containing metal cations by ligands exchange

2002 ◽  
Vol 22 (2) ◽  
pp. 171-176 ◽  
Author(s):  
M.N Antipina ◽  
I.V Bykov ◽  
R.V Gainutdinov ◽  
Yu.A Koksharov ◽  
A.P Malakho ◽  
...  
Keyword(s):  
Structural Control ◽  
Metal Cations ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Ligands Exchange

Halogen ligands exchange in palladium(II) acyclic diaminocarbene complexes and their stereochemistry

2017 ◽  
Vol 458 ◽  
pp. 190-198 ◽  
Author(s):  
Dina V. Boyarskaya ◽  
Mikhail A. Kinzhalov ◽  
Vitalii V. Suslonov ◽  
Vadim P. Boyarskiy
Keyword(s):  
Acyclic Diaminocarbene ◽  
Ligands Exchange
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