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https://www.readbyqxmd.com/read/30516873/reductive-nitric-oxide-coupling-at-a-dinickel-core-isolation-of-a-key-cis-hyponitrite-intermediate-en-route-to-n2o-formation
#1
Eleonora Ferretti, Sebastian Dechert, Serhiy Demeshko, Max C Holthausen, Franc Meyer
Reductive coupling of nitric oxide (NO) to give N2O is an important reaction in the global nitrogen cycle. Here, a dinickel(II) dihydride complex 1 that releases H2 upon substrate binding and serves as a dinickel(I) scaffold is shown to reductively couple two molecules of NO within the bimetallic cleft. The resulting hyponitrite complex 2 features an unprecedented cis-[N2O2]2- binding mode that has been computationally proposed as a key intermediate in flavodiiron nitric oxide reductases (FNORs). NMR and DFT evidence indicates facile rotational fluxionality of the [N2O2]2- unit, which allows to access an isomer that is prone to N2O release...
December 5, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30516206/novel-bimetallic-mof-phosphors-with-an-imidazolium-cation-structure-phonons-high-pressure-phase-transitions-and-optical-response
#2
Maciej Ptak, Bartosz Zarychta, Dagmara Stefańska, Aneta Ciupa, Waldeci Paraguassu
We report the synthesis, crystal structure, phonons and luminescence properties of three novel heterometallic metal organic frameworks (MOFs) with perovskite-like topology of the following formulas: [C3H5N2]Na0.5Cr0.5(HCOO)3 (ImNaCr), [C3H5N2]Na0.5Al0.5(HCOO)3 (ImNaAl) and [C3H5N2]Na0.5Al0.475Cr0.025(HCOO)3 (ImNaAlCr with 5 mol% of Cr3+). ImNaCr crystallizes in a monoclinic system (P2/n space group) with one imidazolium cation (Im+) in an asymmetric unit forming six N-HO and four C-HO hydrogen bonds. In contrast to other known heterometallic MOFs, the complete substitution of Cr3+ ions with smaller Al3+ ions leads to a change of the crystal symmetry...
December 5, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/30514489/catalytic-hydrodeoxygenation-of-rubber-seed-oil-over-sonochemically-synthesized-ni-mo-%C3%AE-al-2-o-3-catalyst-for-green-diesel-production
#3
Mariam Ameen, Mohammad Tazli Azizan, Anita Ramli, Suzana Yusup, Mohamad Sahban Alnarabiji
Hydrodeoxygenation is one of the promising technologies for the transformation of triglycerides into long-chain hydrocarbon fuel commonly known as green diesel. The hydrodeoxygenation (HDO) of rubber seed oil into diesel range (C15 -C18 ) hydrocarbon over non-sulphided bimetallic (Ni-Mo/γ-Al2 O3 solid catalysts were studied. The catalysts were synthesized via wet impregnation method as well as sonochemical method. The synthesized catalysts were subjected to characterization methods including FESEM coupled with EDX, XRD, BET, TEM, XPS, NH3 -TPD, CO-chemisorption and H2 -TPR in order to investigate the effects of ultrasound irradiations on physicochemical properties of the catalyst...
March 2019: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30511713/c-60-decorated-nickel-cobalt-phosphide-as-an-efficient-and-robust-electrocatalyst-for-hydrogen-evolution-reaction
#4
Zhiling Du, Nahar Jannatun, Danyang Yu, Juan Ren, Wenhuan Huang, Xing Lu
High-activity electrocatalysts play a crucial role in energy conversion through splitting water to produce hydrogen. Here we report the synthesis of a bimetallic phosphide of Ni-Co-P coupled with C60 molecules which acts as an electrocatalyst for the hydrogen evolution reaction (HER). Powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) characterization reveals that the synthesized C60-decorated Ni-Co-P nanoparticles have an average diameter of ∼4 nm with rich structural defects. Electrochemical tests show that the as-synthesized C60-decorated Ni-Co-P catalyst with a C60-content of 3...
December 4, 2018: Nanoscale
https://www.readbyqxmd.com/read/30511057/bimetallic-gold-nanorods-with-enhanced-biocorona-formation-for-doxorubicin-loading-and-sustained-release
#5
Debolina Chakraborty, Lavanya Mohan, Sruthi Ann Alex, Natarajan Chandrasekaran, Amitava Mukherjee
The biomedical applicability of gold nanorods (AuNRs) arises due to their interesting optical and photothermal properties, which can result in the formation of a protein corona layer when exposed to the physiological system. The current study focuses on the effect of bimetallic coatings of AuNRs (AuNRs@Pd and AuNRs@Cu) on protein corona formation, and the potential application of protein-coronated bimetallic AuNRs was investigated for doxorubicin (dox) loading, release, and in vitro cytotoxicity analysis. Two significant proteins in blood serum, namely, human serum albumin (HSA) and transferrin, were chosen for the protein coronation...
December 4, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/30504079/responses-of-flocculated-activated-sludge-to-bimetallic-ag-fe-nanoparticles-toxicity-performance-activity-enzymatic-and-bacterial-community-shift
#6
Ahmad Reza Yazdanbakhsh, Mohammad Rafiee, Hasti Daraei, Mohammad Ali Amoozegar
Ever-increasing production and use of nanoparticles (NPs) have aroused overarching concerns for their toxic effects on the environment and human. In the present study, the toxic effects of Silver (Ag) and Iron (Fe) NPs on the performance of activated sludge were investigated under continuous aerobic/anoxic/anaerobic conditions in laboratory-scale sequencing batch reactors (SBRs).Activated sludge was exposed to various concentrations (5-100 mg/L) of Ag-Fe NPs for 60 days and its response was assessed through the enzymatic activity, COD, nitrogen (TN) and phosphorus (TP) removal, toxicity tests, as well as variations in bacterial community...
November 27, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30504035/effects-of-surfactant-on-the-degradation-of-2-2-4-4-tetrabromodiphenyl-ether-bde-47-by-nanoscale-ag-fe-particles-kinetics-mechanisms-and-intermediates
#7
Zhiqiang Zheng, Guining Lu, Rui Wang, Kaibo Huang, Xueqin Tao, Yulu Yang, Mengyao Zou, Yingying Xie, Hua Yin, Zhenqing Shi, Zhi Dang
Surfactants are known to enhance the degradation of halogenated organics by nanoscale zerovalent iron (n-ZVI) or n-ZVI-based bimetallic particles, but the mechanism of the promotion is not well understood. In this study, we used nanoscale Ag/Fe particles (n-Ag/Fe) to degrade 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) in different surfactant solutions. The results show that the nonionic surfactant TX-100 had the best promoting effect, which might be attributed to the decrease in particle agglomeration and improvement of mass transfer efficiency after the adsorption of TX-100 on n-Ag/Fe...
November 23, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/30502190/ultrasensitive-detection-of-sudan-i-in-food-samples-by-a-quantitative-immunochromatographic-assay
#8
Diandian Deng, Hong Yang, Chang Liu, Kang Zhao, Jianguo Li, Anping Deng
An immunochromatographic assay (ICA) based on surface-enhanced Raman scattering (SERS) for ultrasensitive determination of Sudan I in food samples was reported. Gold-silver core-shell bimetallic nanorods (referred to as Au@Ag NRs) were synthesized, characterized and used as the substrate for preparation of the ICA. Polyclonal antibody against Sudan I was immobilized on the surface of the Au@Ag NRs carrying the Raman reporter 5,5'-dithiobis (2-nitrobenzoic acid). The Raman scattering intensity on the test line was used for quantitation of Sudan I...
March 30, 2019: Food Chemistry
https://www.readbyqxmd.com/read/30501321/dynamical-characterization-of-micro-cantilevers-by-different-excitation-methods-in-dynamic-atomic-force-microscopy
#9
Xinfeng Tan, Shuai Shi, Dan Guo, Jianbin Luo
An atomic force microscopy experimental setup was modified to analyze the differences between the piezoelectric excitation and the photothermal excitation (PTE) for three types of cantilevers, including two aluminum coated cantilevers and one uncoated single-crystalline silicon cantilever. The results show the PTE is a direct and localized excitation method to yield smooth and clean frequency spectra representing only the dynamics of the cantilever without the coupling with mechanical components. The cantilever can be easily excited for a high and controllable amplitude by the PTE method as compared to the piezoelectric excitation...
November 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/30501196/probing-atomic-distributions-in-mono-and-bimetallic-nanoparticles-by-supervised-machine-learning
#10
Janis Timoshenko, Cody J Wrasman, Mathilde Luneau, Tanya Shirman, Matteo Cargnello, Simon Russell Bare, Joanna Aizenberg, Cynthia M Friend, Anatoly I Frenkel
Properties of mono- and bimetallic metal nanoparticles (NPs) may depend strongly on their compositional, structural (or geometrical) attributes and their atomic dynamics, all of which can be efficiently described by a partial radial distribution function (PRDF) of metal atoms. For NPs that are several nanometers in size, finite size effects may play a role in determining crystalline order, interatomic distances and particle shape. Bimetallic NPs may also have different compositional distributions than bulk materials...
December 3, 2018: Nano Letters
https://www.readbyqxmd.com/read/30500170/copper-and-silver-complexes-of-a-redox-active-diphosphine-diboraanthracene-ligand
#11
Jordan W Taylor, Alex McSkimming, Marc-Etienne Moret, W Hill Harman
Redox-active ligands and Z-type acceptor ligands have emerged as promising strategies for promoting multielectron redox chemistry at transition-metal centers. Herein, we report the synthesis and characterization of copper and silver complexes of a diphosphine ligand featuring a diboraanthracene core (B2 P2 , 9,10-bis(2-(diisopropylphosphino)phenyl)-9,10-dihydroboranthrene) that is capable of serving as both a redox reservoir and a Z-type ligand. Metalation of B2 P2 with CuX (X = Cl, Br, I) results in the formation of bimetallic complexes of the formula (B2 P2 )Cu2 X2 of two different structure types, depending on the halide...
November 30, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/30499654/plasmon-near-field-coupling-of-bimetallic-nanostars-and-hierarchical-bimetallic-sers-hot-field-toward-ultrasensitive-simultaneous-detection-of-multiple-cardiorenal-syndrome-biomarkers
#12
Yu Su, Shuting Xu, Jinan Zhang, Xiang-Jian Chen, Li-Ping Jiang, Tingting Zheng, Jun-Jie Zhu
Cardiorenal syndrome (CRS) has posed tremendous challenges in patient management, and the detection of serum biomarkers may provide opportunities for early diagnosis and effective treatment. Herein, we introduce a novel surface-enhanced Raman scattering (SERS)-based sandwich immunoassay platform to simultaneously detect cardiac troponin I (cTnI), N-terminal prohormone of brain natriuretic peptide (NT-ProBNP) and neutrophil gelatinase-associated lipocalin (NGAL) for the early diagnosis of CRS by using Raman reporter molecules-labeled Ag-Au nanostars (Ag-Au NSs) as nanotags and three-dimensional ordered macroporous (3DOM) Au-Ag-Au plasmonic array as substrate...
November 30, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/30499458/amorphous-metal-boride-as-a-novel-platform-for-acetylcholinesterase-biosensor-development-and-detection-of-organophosphate-pesticides
#13
Xiong Lu, Yanshan Li, Lu Tao, Dandan Song, Yuanzhe Wang, Yan Li, Faming Gao
The exploration of new materials for modifying electrodes is important to advance electrochemical biosensors. Herein, we demonstrated that amorphous bimetallic boride material (Co-2Ni-B) prepared by a simple and facile aqueous reaction is an efficient matrix to immobilize acetylcholinesterase (AChE) to construct a biosensor for the determination of organophosphate pesticides. The effects of different composition and crystallinity on its electrochemical performance are investigated, and the optimization studies of the biological transducer were also discussed...
November 30, 2018: Nanotechnology
https://www.readbyqxmd.com/read/30497258/exact-stoichiometry-of-ce-x-zr-6-x-cornerstones-in-mixed-metal-uio-66-mofs-revealed-by-exafs-spectroscopy
#14
Kirill A Lomachenko, Jannick Jacobsen, Aram L Bugaev, Cesare Atzori, Francesca Bonino, Silvia Bordiga, Norbert Stock, Carlo Lamberti
Bimetallic Ce/Zr-UiO-66 MOFs proved to be promising materials for various catalytic redox applications, representing, together with other bimetallic MOFs, a new generation of porous structures. However, no direct proof for the presence of both metals in a single cornerstone of UiO-type MOFs was reported so far. Employing element-selective XAS techniques herein we demonstrate for the first time that our synthesis route allows obtaining Ce/Zr-UiO-66 MOFs with desired Ce content and bimetallic CeZr5 cornerstones...
November 30, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/30495936/activation-by-oxidation-ferrocene-functionalized-ru-ii-arene-complexes-with-anticancer-antibacterial-and-antioxidant-properties
#15
Changhua Mu, Kathleen E Prosser, Shane Harrypersad, Gregory A MacNeil, Rikesh Panchmatia, John R Thompson, Soumalya Sinha, Jeffrey J Warren, Charles J Walsby
Organometallic Ru(II)-cymene complexes linked to ferrocene (Fc) via nitrogen heterocycles have been synthesized and studied as cytotoxic agents. These compounds are analogues of Ru(II)-arene piano-stool anticancer complexes such as RAPTA-C. The Ru center was coordinated by pyridine, imidazole, and piperidine with 0-, 1-, or 2-carbon bridges to Fc to give six bimetallic, dinuclear compounds, and the properties of these complexes were compared with their non-Fc-functionalized parent compounds. Crystal structures for five of the compounds, their Ru-cymene parent compounds, and an unusual trinuclear compound were determined...
November 29, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/30489080/chiroptical-inversion-of-europium-iii-complexes-by-changing-a-remote-stereogenic-center-of-a-c2-symmetric-bispyrrolidinoindoline-manifold
#16
Tomoaki Taniguchi, Akira Tsubouchi, Yuki Imai, Junpei Yuasa, Hiroki Oguri
As an effort to integrate natural products chemistry and coordination chemistry, a diastereomeric pair of chiral alkaloidal manifolds composed of a bispyrrolidinoindoline (BPI) framework was designed and synthesized to generate luminescent EuIII complexes with switchable chiroptical properties. The C2-symmetric alkaloidal manifolds were linked with bis(benzimidazolyl)pyridine (BBIPy) as an achiral metal-binding component through substituents installed at the stereogenic 2/2' positions of the BPI manifolds. The resulting diastereomeric pair of ligands, syn-L1 and anti-L2, allow pseudo-mirror symmetrical presentation of the metal-binding BBIPy units due to the stereogenic centers on the alkaloidal manifold...
November 29, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/30488665/well-arranged-and-confined-incorporation-of-pdco-nanoparticles-within-a-hollow-and-porous-metal-organic-framework-for-superior-catalytic-activity
#17
Sora Choi, Moonhyun Oh
The catalytic activity of metal nanocatalysts typically reduces due to the agglomeration of unstable metal nanocatalysts during the catalytic reaction. Therefore, the well-designed incorporation of highly active metal nanocatalysts within porous materials is of great importance in preserving their original activity by preventing the agglomeration. Here, we report a convenient method for the confined incorporation of highly active bimetallic PdCo nanocatalysts within a unique hollow and porous metal-organic framework (MOF) support...
November 28, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30488052/n-doped-carbon-shelled-bimetallic-phosphates-for-efficient-electrochemical-overall-water-splitting
#18
Dandan Zhao, Qi Shao, Ying Zhang, Xiaoqing Huang
Metal phosphates are regarded as promising electrocatalysts, while their activity and stability for overall water splitting are not yet fully satisfactory. In order to overcome these limitations, herein we develop a new class of N-doped carbon shelled bimetallic phosphates ((FexCoy)P2O7@N-C) as efficient electrocatalysts for overall water splitting. The shelled bimetallic phosphates can lower the OER overpotential by up to 100 mV compared with their unshelled phosphate counterparts as well as show superior stability up to 80 h at a high current density of 40 mA cm-2 for alkaline water splitting...
November 29, 2018: Nanoscale
https://www.readbyqxmd.com/read/30487000/preparation-and-characterization-of-bimetallic-fe-ni-oxide-nanoparticles-using-liquid-phase-plasma-process
#19
Won-June Lee, Young-Kwon Park, Jung-Sik Kim, Byung-Joo Kim, Kay-Hyeok An, Heon Lee, Sang-Chul Jung
The Fe-Ni oxide bimetallic nanoparticles (FNOBNPs) were synthesized in the liquid phase plasma (LPP) method employed an iron chloride and nickel chloride as metal precursors. The sphericalshaped FNOBNPs were synthesized by the LPP process and, the size of particles was growing along with the progression of LPP reaction. The synthesized FNOBNPs were comprised of Fe₃O₄ and NiO. Iron had a higher reduction potential than nickel and resulted in higher iron composition in the synthesized FNOBNPs. The control of molar ratio of metal precursors in initial reactant solution was found that it could be employed as a means to control the composition of the elements in FNOBNP...
April 1, 2019: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/30480292/reliable-and-quantitative-sers-detection-of-dopamine-levels-in-human-blood-plasma-using-a-plasmonic-au-ag-nanocluster-substrate
#20
Viet-Duc Phung, Won-Sik Jung, Thuy-An Nguyen, Jong-Hoon Kim, Sang-Wha Lee
Accurate and rapid blood-based detection of dopamine levels can aid in the diagnosis and monitoring of diseases related to dopaminergic dysfunction. For the sensitive detection of dopamine levels in human blood plasma (i.e., plasma dopamine levels), a silver-plated Au bimetallic nanocluster (so called plasmonic Au/Ag nanocluster) was prepared as a surface-enhanced Raman scattering (SERS) substrate by the combination of electrodeposition and electroless plating methods. The plasmonic effect of the Au/Ag nanocluster substrate was optimized by controlling the particle morphology, packing density, and interparticle distance, showing the best performance in its SERS activity...
November 27, 2018: Nanoscale
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