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Metal Complexes

Jian Wang, Min Liu, Chao Duan, Jianpeng Sun, Yaowei Xu
In this work, we develop a facile route to prepare a cellulose-based adsorbent, namely carboxymethylated cellulose fiber (CMF), for the water purification. The as-prepared CMF bio-adsorbent was synthesized via a controllable carboxymethylation modification in the case of maintaining inherent fibrous framework. The CMF bio-adsorbent was applied to adsorb the heavy metal ions, such as Cu(II) and Ni(II), from aqueous solution. Results showed that the CMF adsorbent exhibited excellent adsorption capacity toward these ions and a higher selectivity for the Cu(II) removal based on surface complexation and electrostatic interaction mechanisms...
February 15, 2019: Carbohydrate Polymers
Gaoxiang Liu, Evangelos Miliordos, Sandra M Ciborowski, Martin Tschurl, Ulrich Boesl, Ulrich Heiz, Xinxing Zhang, Sotiris S Xantheas, Kit Bowen
We report experimental and computational results pertaining to the activation and splitting of single water molecules by single atomic platinum anions. The anion photoelectron spectra of [Pt(H2 O)]- , formed under different conditions, exhibit spectral features that are due to the anion-molecule complex, Pt- (H2 O), and to the reaction intermediates, HPtOH- and H2 PtO- , in which one and two O-H bonds have been broken, respectively. Additionally, the observations of PtO- and H2 + in mass spectra strongly imply that water splitting via the reaction Pt- + H2 O → PtO- + H2 has occurred...
December 14, 2018: Journal of Chemical Physics
Kunzhou Wang, Bin Wang, Huailiang Li, Xianguo Tuo, Kun Xiong, Minhao Yan, Jérémie Courtois
HYPOTHESIS: Nanoparticles functionalized with ligands which can on-demand and remotely be detached have recently attracted interest as stimuli-responsive materials. Research is now focused on multi-responsive systems, with applications in environmental science and biomedicine. The possibility to covalently couple two different ligands on a single nanoparticles, and to release them independently is investigated. This concept of nanoparticles functionalized with dual on-demand cleavable ligands is exploited in ground water decontamination and radionuclides separation...
December 7, 2018: Journal of Colloid and Interface Science
Vincent Coger, Nina Million, Christoph Rehbock, Bernd Sures, Milen Nachev, Stephan Barcikowski, Nina Wistuba, Sarah Strauß, Peter M Vogt
Wound healing is a complex orchestration of processes involving cell proliferation, migration, differentiation, anabolism, and catabolism in order to restore skin continuity. Within these processes, elements such as metallic ions are involved due to their implications in cell behavior and enzymatic activity regulation. This study analyzed the kinetics of zinc, iron, copper and magnesium concentrations in a full thickness open wound rat model over 14 days. We made wounds with a diameter of 6 mm on the back of Lewis rats and let them heal naturally prior to analysis by histology and inductively coupled plasma mass spectrometry analysis...
December 14, 2018: Biological Trace Element Research
Ji Hun Park, Sohee Choi, Hee Chul Moon, Hyelin Seo, Ji Yup Kim, Seok-Pyo Hong, Bong Soo Lee, Eunhye Kang, Jinho Lee, Dong Hun Ryu, Insung S Choi
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
December 14, 2018: Scientific Reports
G Polotskaya, A Pulyalina, M Goikhman, I Podeshvo, V Rostovtseva, S Shugurov, I Gofman, N Saprykina, N Gulii, N Loretsyan, A Toikka
Polymer membranes with improved transport properties are required for effective separation of organic mixtures (such as methanol‒hexane system) by combination of pervaporation and azeotropic distillation. The present work is devoted to comparative study of two types of membranes based on poly(amidoimide acid) with 2,2'-biquinoline-6,6' units in the backbone; the objects were prepared (i) from the initial polymer and (ii) from the polymer-metal complex (with Cu(I)). Thermo-mechanical and mass spectrometric investigations demonstrated good operational properties of the samples...
December 14, 2018: Scientific Reports
M Prezioso, M R Mahmoodi, F Merrikh Bayat, H Nili, H Kim, A Vincent, D B Strukov
Spiking neural networks, the most realistic artificial representation of biological nervous systems, are promising due to their inherent local training rules that enable low-overhead online learning, and energy-efficient information encoding. Their downside is more demanding functionality of the artificial synapses, notably including spike-timing-dependent plasticity, which makes their compact efficient hardware implementation challenging with conventional device technologies. Recent work showed that memristors are excellent candidates for artificial synapses, although reports of even simple neuromorphic systems are still very rare...
December 14, 2018: Nature Communications
F Yushra Thanzeel, Kaluvu Balaraman, Christian Wolf
Click reactions have become powerful synthetic tools with unique applications in the health and materials sciences. Despite the progress with optical sensors that exploit the principles of dynamic covalent chemistry, metal coordination or supramolecular assemblies, quantitative analysis of complex mixtures remains challenging. Herein, we report the use of a readily available coumarin conjugate acceptor for chiroptical click chirality sensing of the absolute configuration, concentration and enantiomeric excess of several compound classes...
December 14, 2018: Nature Communications
Jie Cheng, Jianwei Shao, Yifei Ye, Yang Zhao, Chengjun Huang, Li Wang, Mingxiao Li
Carbonyl compounds in water sources are typical characteristic pollutants, which are important indicators in the health risk assessment of water quality. Commonly used analytical chemistry methods face issues such as complex operations, low sensitivity, and long analysis times. Here, we report a silicon microfluidic device based on click chemical surface modification that was engineered to achieve rapid, convenient and efficient capture of trace level carbonyl compounds in liquid solvent. The micro pillar arrays of the chip and microfluidic channels were designed under the basis of finite element (FEM) analysis and fabricated by the microelectromechanical systems (MEMS) technique...
December 13, 2018: Sensors
Zhennan Zhao, Xiang Zhang, Chang-E Li, Tianfeng Chen
The effective design of a targeted drug delivery system could improve the therapeutic efficacy of anticancer drugs by reducing their undesirable adsorption and toxic side effects. Here, an RGD-peptide functionalized and bioresponsive ruthenium prodrug (Ru-RGD) was designed for both cancer therapy and clinical diagnosis. This prodrug can be selectively delivered to cervical tumor sites to enhance theranostic efficacy. The benzimidazole-based ligand of the complex is susceptible to acidic conditions so, after reaching the tumor microenvironment, ligand substitution occurs and the therapeutic drug is released...
December 5, 2018: Biomaterials
Srivithya Vellampatti, Gopalakrishnan Chandrasekaran, Sekhar Babu Mitta, Sreekantha Reddy Dugasani, Vinoth-Kumar Lakshmanan, Sung Ha Park
DNA nanotechnology has laid a platform to construct a variety of custom-shaped nanoscale objects for functionalization of specific target materials to achieve programmability and molecular recognition. Herein, we prepared DNA nanostructures [namely, synthetic DNA rings (RDNA) and DNA duplexes extracted from salmon (SDNA)] containing metal ions (M2+ ) such as Cu2+ , Ni2+ , and Zn2+ as payloads for delivery to exterminate highly pathologic hospital bacterial strains (e.g., Escherichia coli and Bacillus subtilis) and prostate cancer cells (i...
December 14, 2018: ACS Applied Materials & Interfaces
Yanmei Shi, Yu Yu, Yu Liang, Yonghua Du, Bin Zhang
Oxygen evolution reaction (OER) is an important half reaction in many energy conversion and storage techniques. However, the development of a low-cost easy-prepared OER electrocatalyst with high mass activity and rapid kinetics is still challenging. Here, we report the facile deposition of tannin-NiFe (TANF) complex film on carbon fiber paper (CP) as a highly efficient OER electrocatalyst. TANF performs rapid OER reaction kinetics with a very small Tafel slope of 28 mV dec-1. And the mass activity of TANF reaches as high as 9...
December 14, 2018: Angewandte Chemie
Woo-Bin Jung, Soo-Yeon Cho, Bong Lim Suh, Hae-Wook Yoo, Hwan-Jin Jeon, Jihan Kim, Hee-Tae Jung
The development of complex nanostructures containing a homo- and heteromixture of two or more metals is a considerable challenge in nanotechnology. However, previous approaches are considerably limited to the number of combinations of metals depending on the compatibility of elements, and to the complex shape control of the nanostructure. In this study, a significant step is taken toward resolving these limitations via the utilization of a low-energy argon-ion bombardment. The multilayer films are etched and re-sputtered on the sidewall of the pre-pattern, which is a secondary sputtering phenomenon...
December 14, 2018: Advanced Materials
Jean-Michel Saveant
In the current development of homogeneous catalysis of electrochemical reactions, related to contemporary renewable energy challenges, catalytic reaction schemes often involves proton coupled electron transfer sequences. The proton source (or sink) may then be an acid (or a base) present in the solution acting as a cosubstrate participating stoichiometrically and kinetically to the catalytic process. On this ground, the idea has soon emerged that installing the proton donor (for reductions, or acceptor for oxidations) inside the catalyst molecule should be beneficial in terms of efficiency, since it would then be closer to the nerve center of the process (usually the metal in the case of transition metal complex catalysts)...
December 13, 2018: Angewandte Chemie
Gernot Frenking, Mingfei Zhou, Chaoxian Chi, Luyan Meng, Mingbiao Luo, Sudip Pan, Lili Zhao
The alkali metal-nickel carbonyl anions ENi(CO)3- with E = Li, Na, K, Rb, Cs have been produced and characterized by mass-selected infrared photodissociation spectroscopy in the gas phase. The molecules are the first examples of 18-electron transition metal complexes with alkali atoms as covalently bonded ligands. The calculated equilibrium structures possess C3v geometry, where the alkali atom is located above a nearly planar Ni(CO)3- fragment. The analysis of the electronic structure reveals a peculiar bonding situation where the alkali atom is covalently bonded not only to Ni but also to the carbon atoms...
December 12, 2018: Angewandte Chemie
Fan Wang, Zicheng Zuo, Liang Li, Feng He, Fushen Lu, Yuliang Li
The structural and interfacial stabilities of metal oxides (MOs) are key issues while facing the volumetric variation and intensive interfacial polarization in electrochemical applications, including lithium-ion batteries (LIBs), supercapacitors, and catalysts. The growth of a seamless all-carbon interfacial layer on MOs with complex dimensions is not only a scientific problem, but also a practical challenge in these fields. Here, the growth of graphdiyne under ultramild condition is successfully implemented in situ for coating MOs of complex dimensions...
December 13, 2018: Advanced Materials
Leonid A Kaledin, Alexey L Kaledin, Michael C Heaven
Configuration interaction ligand field theory (CI LFT) calculations of the electronic energy levels of ThO were performed by treating the molecular electronic states as Th 2+ free-ion levels perturbed by the ligand field of O2- . Twenty nine experimentally characterized ThO v = 0 energy levels, together with the energy difference between the v = 0 levels of the Y and W states were fitted using a CI LFT model that included Th 2+ 7s 2 , 6d7s, 6d2 , 7s7p, 6d7p, 5f7s, and 7p2 configurations. Predictions from these calculations were used to provide tentative assignments for 171 out of 250 ThO band heads listed by Gatterer et al...
January 15, 2019: Journal of Computational Chemistry
Hyojong Yoo, Van Cam Thi Le, Hien Duy Mai, Philjae Kang
Effective incorporation of multiple types of ligands in a given coordination structure provides structural complexity and functional diversity to the resultant coordination-driven assembly. One of the most widely-used synthetic approaches is to utilize the molecular symmetry principle to combine multiple ligands and specific metallic centers in a preferred manner. The variation of metal ions can be helpful to understand the importance of symmetry for the generation of structurally hierarchical supramolecular platforms...
December 11, 2018: Chemistry: a European Journal
Qianchun Zhang, Yanqun Yang, Yongzhi Zhi, Xingyi Wang, Yun Wu, Yuguo Zheng
A facile and efficient strategy is developed to modify aptamers on the surface of the magnetic metal-organic framework MIL-101 for the rapid magnetic solid-phase extraction of ochratoxin A. To the best of our knowledge, this is the first attempt to create a robust aptamer-modified magnetic MIL-101 with covalent bonding for the magnetic separation and enrichment of ochratoxin A. The saturated adsorption of ochratoxin A by aptamer-modified magnetic MIL-101 was 7.9 times greater than that by magnetic metal-organic framework MIL-101 due to the former's high selective recognition as well as good stability...
November 22, 2018: Journal of Separation Science
Qi Xia, Hou Wang, Binbin Huang, Xingzhong Yuan, Jingjing Zhang, Jin Zhang, Longbo Jiang, Ting Xiong, Guangming Zeng
Metal organic frameworks (MOFs), as an original kind of organic-inorganic porous material, are constructed with metal centers and organic linkers via a coordination complexation reaction. Among uncountable MOF materials, iron-containing metal organic frameworks (Fe-MOFs) have excellent potential in practical applications owing to their many fascinating properties, such as diverse structure types, low toxicity, preferable stability, and tailored functionality. Here, recent research progresses of Fe-MOFs in attractive features, synthesis, and multifunctional applications are described...
December 7, 2018: Small
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