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https://www.readbyqxmd.com/read/28094932/series-d-f-heteronuclear-metal-organic-frameworks-color-tunability-and-luminescent-probe-with-switchable-properties
#1
Xun Feng, Yuquan Feng, Nan Guo, Yiling Sun, Tian Zhang, Lufang Ma, Liya Wang
A series of five unique d-f heteronuclear luminescent metal-organic frameworks (MOFs) in an entangled polyrotaxane array and the light-harvesting block homonuclear zinc compound have been isolated successfully and characterized. The series of isostructural polymers feature 3,4-connected (4.8(2))(4.8(3).9(2))(6.8.9)2(6.9(2))(8(3)) topology and high stability, exhibiting diverse void spaces. By taking advantage of the isostructural MOFs 2 and 3, the intensities of red and green emissions can be modulated by adjusting the ratios of Eu(III) and Tb(III) ions correspondingly, and white-light emission can be generated by a combination of different doped Tb(III) and Eu(III) concentrations...
January 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28094515/nanoporous-materials-for-the-onboard-storage-of-natural-gas
#2
K Vasanth Kumar, Kathrin Preuss, Maria-Magdalena Titirici, Francisco Rodríguez-Reinoso
Climate change, global warming, urban air pollution, energy supply uncertainty and depletion, and rising costs of conventional energy sources are, among others, potential socioeconomic threats that our community faces today. Transportation is one of the primary sectors contributing to oil consumption and global warming, and natural gas (NG) is considered to be a relatively clean transportation fuel that can significantly improve local air quality, reduce greenhouse-gas emissions, and decrease the energy dependency on oil sources...
January 17, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28094156/removal-of-toxic-metals-during-biological-treatment-of-landfill-leachates
#3
T Robinson
Progressive implementation of the European Water Framework Directive has resulted in substantial changes in limits for discharges of heavy metals both to watercourses, and to sewer. The objective of this paper is to provide original, real, full-scale data obtained for removal of metals during aerobic biological leachate treatment, and also to report on studies carried out to look at further trace metal removal. Polishing technologies examined and investigated include; the incorporation of ultrafiltration (UF) membranes into biological treatment systems, the use of ion exchange, and of activated carbon polishing processes...
January 13, 2017: Waste Management
https://www.readbyqxmd.com/read/28093585/surface-mounted-mof-templated-fabrication-of-homochiral-polymer-thin-film-for-enantioselective-adsorption-of-drugs
#4
Zhi-Gang Gu, Wen-Qiang Fu, Min Liu, Jian Zhang
A self-polymerized chiral monomer 3,4-dihydroxy-l-phenylalanine (l-DOPA) has been introduced into the pores of an achiral surface-mounted metal organic framework (SURMOF), and then the homochiral poly(l-DOPA) thin film has been successfully formed after UV light irradiation and etching of the SURMOF. Remarkably, such a poly(l-DOPA) thin film exhibited enantioselective adsorption of naproxen. This study opened a SURMOF-templated approach for preparing porous polymer thin films.
January 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28093365/vitamin-b3-metal-organic-frameworks-as-potential-delivery-vehicles-for-therapeutic-nitric-oxide
#5
Rosana V Pinto, Fernando Antunes, João Pires, Vanessa Graça, Paula Brandão, Moisés L Pinto
: The synthesis and structural characterization of two isostructural metal (M=Ni, Co) 3D framework structure that integrate vitamin B3 building blocks with NO delivery capabilities and low toxicity is presented. The compounds with a formula [M2(μ2-H2O)(μ-vitamin B3)4]·2H2O contain two crystallographic distinct divalent metal centers connected by a bridging water and carboxylate group from vitamin B3. The porous compounds have the capability of storing and releasing nitric oxide (NO) in a slow and reversible manner, with released amounts of 2...
January 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28089089/-27-al-27-al-double-quantum-single-quantum-mas-nmr-applications-to-the-structural-characterization-of-microporous-materials
#6
REVIEW
Charlotte Martineau-Corcos, Jiri Dědeček, Francis Taulelle
In this paper, we review and illustrate applications, reported in the literature or used in our group, of (27)Al-(27)Al double-quantum single-quantum (DQ-SQ) MAS NMR experiments for the structural characterization of Al-containing microporous solids, namely zeolites, aluminophosphates and metal-organic frameworks. Information regarding the periodic frameworks or the localization of the various aluminum species in the materials are obtained from the analysis of the two-dimensional NMR spectra, which allows getting local structural details sometimes inaccessible from other characterization technique...
December 28, 2016: Solid State Nuclear Magnetic Resonance
https://www.readbyqxmd.com/read/28081368/smart-metal-organic-framework-coatings-triggered-anti-biofilm-compound-release
#7
Birgit Claes, Tom Boudewijns, Laurens Muchez, Geert Hooyberghs, Erik V Van der Eycken, Jozef Vanderleyden, Hans P Steenackers, Dirk E De Vos
Metal-organic frameworks (MOFs) have a large potential for delivery of active molecules. Here, a MOF coating is investigated as a smart host matrix for triggered release of anti-biofilm compounds. Besides a coating consisting of the regular Fe-terephthalate MIL-88B(Fe), a new hydrophobic MIL-88B(Fe) coating is synthesized in hydrothermal conditions using palmitic acid as a lattice terminating group. These porous materials are used as a host matrix for the anti-biofilm compound 5-(4-chlorophenyl)-N-(2-isobutyl)-2-aminoimidazole, which has a specific biofilm inhibiting effect at concentrations at which no activity against planktonic cells is detected...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28080019/controlled-growth-of-metal-organic-framework-on-upconversion-nanocrystals-for-nir-enhanced-photocatalysis
#8
Mohua Li, Zhenjian Zheng, Yangqiong Zheng, Cao Cui, Chunxia Li, Zhengquan Li
Development of MOF-based photocatalysts is intriguing research due to their structural flexibility and tremendous catalytic sites, whereas most MOFs only can take use of UV/visible light and lack of response to NIR light. Herein, we present a facile approach to integrate upconversion nanoparticles (UCNPs) with MOF to build a NIR-responsive composite photocatalyst. The MOF shell with controllable thickness can be grown on the UCNPs, thus exhibiting tunable photocatalytic activities under NIR irradiation. Furthermore, we extend visible absorption of the MOF shell by adding -NH2 groups so that the composite photocatalysts have a better utilization of UC emissions and sunlight to improve their activities...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28079361/controllable-synthesis-of-smart-multifunctional-nanoscal-metal-organic-framework-for-magnetic-resonance-optical-imaging-and-targeted-drug-delivery
#9
Xuechuan Gao, Manjue Zhai, Weihua Guan, Jingjuan Liu, Zhiliang Liu, Alatangaole Damirin
As a result of their extraordinarily large surfaces and well-defined pores, the design of multifunctional metal-organic framework (MOF) is crucial for drug delivery while has been rarely reported. In this paper, a novel drug delivery system (DDS) based on nanoscale metal-organic framework (MOF) was developed for using in cancer diagnosis and therapy. This MOF based tumour targeting DDS was fabricated by a simple post-synthetic surface modification process. Firstly, magnetic mesoporous nanomaterial Fe-MIL-53-NH2 was devoted for encapsulating the drug and served as a magnetic resonance (MR) contrast agent...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28078886/enhanced-activity-for-hydrogen-evolution-reaction-over-cofe-catalysts-by-alloying-with-small-amount-of-pt
#10
Jitang Chen, Yang Yang, Jianwei Su, Peng Jiang, Guoliang Xia, Qianwang Chen
The hydrogen evolution reaction (HER) is highly relied on Pt-based electrocatalysts with high activity and stability. For a long time, a host of efforts have been made in the development of novel platinum nano-structures with a low amount of Pt because the scarcity and high price of Pt hinders its practical applications. Here, we report the preparation of PtCoFe@C electrocatalysts with remarkably reduced Pt loading amount of 4.60%by annealing Pt-doped metal-organic frameworks (MOFs). The electrocatalyst demonstrated an outstanding performance with only 45 mV overpotential to achieve the 10 mA cm-2 current density, which is quite close to that of the commercial 20% Pt/C catalyst...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28075125/multifunctional-nanoparticles-by-coordinative-self-assembly-of-his-tagged-units-with-metal-organic-frameworks
#11
Ruth Röder, Tobias Preiß, Patrick Hirschle, Benjamin Steinborn, Andreas Zimpel, Miriam Hoehn, Joachim O Rädler, Thomas Bein, Ernst Wagner, Stefan Wuttke, Ulrich Lächelt
Self-assembly of individual units into multicomponent complexes is a powerful approach for the generation of functional super-structures. We present the coordinative interaction of oligohistidine-tags (His-tags) with metal-organic framework nanoparticles (MOF NPs). By this novel concept, different molecular units can be anchored on the outer surface of MOF NPs in a self-assembly process generating multifunctional nanosystems. The article focuses on two main objectives: first, the detailed investigation of the assembly process and fundamental establishment of the novel functionalization concept; and second, its subsequent use for the development of biomacromolecule (e...
January 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28075123/nitrogen-doped-yolk-shell-structured-cose-c-dodecahedra-for-high-performance-sodium-ion-batteries
#12
Yifang Zhang, Anqiang Pan, Lin Ding, Zilong Zhou, Yaping Wang, Shaoyu Niu, Shuquan Liang, Guozhong Cao
In this work, nitrogen-doped, yolk-shell structured CoSe/C mesoporous dodecahedra are successfully prepared by using a self-sacrificial templating strategy. The CoSe nanoparticles are in-situ formed in the metal organic frameworks and the organic species are simultaneously converted into nitrogen-doped carbon in an inert atmosphere. For the yolk-shell structured CoSe/C composite, the carbon framework has relative high graphitizing extent and high nitrogen content (17.65%). Furthermore, the CoSe nanoparticles with size of around 15 nm are coherently confined in the mesoporous carbon framework...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28075116/metal-organic-frameworks-for-thin-layer-chromatographic-applications
#13
Claudia Schenk, Christel Kutzscher, Franziska Drache, Stella Helten, Irena Senkovska, Stefan Kaskel
Preparation of thin-layer chromatographic (TLC) plates based on metal-organic frameworks (MOFs) as porous stationary phases is described. DUT-67 (DUT = Dresden University of Technology), a zirconium based MOF, was used in combination with a fluorescent indicator as stationary phase for analyzing a small selection of a wide spectrum of relevant analytes. The successful separation of benzaldehyde from trans-cinnamaldehyde and 4-aminophenol from 2-aminotoluene is reported as a model system using optimized eluent mixtures containing acetic acid...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28075060/self-templated-synthesis-of-co-and-n-doped-carbon-microtubes-composed-of-hollow-nanospheres-and-nanotubes-for-efficient-oxygen-reduction-reaction
#14
Sung Hoon Ahn, Arumugam Manthiram
A facile, self-templated strategy for the synthesis of Co- and N-doped carbon microtubular structures composed of nanoscale hollow spheres and nanotubes is proposed. Cobalt oxalate microtubes serve simultaneously as the solid cobalt precursor for the in situ conversion reaction to metal-organic framework and self-templates for the 1D tubular structure.
January 11, 2017: Small
https://www.readbyqxmd.com/read/28074899/mof-derived-multifractal-porous-carbon-with-ultrahigh-lithium-ion-storage-performance
#15
Ang Li, Yan Tong, Bin Cao, Huaihe Song, Zhihong Li, Xiaohong Chen, Jisheng Zhou, Gen Chen, Hongmei Luo
Porous carbon is one of the most promising alternatives to traditional graphite materials in lithium-ion batteries. This is not only attributed to its advantages of good safety, stability and electrical conductivity, which are held by all the carbon-based electrodes, but also especially ascribed to its relatively high capacity and excellent cycle stability. Here we report the design and synthesis of a highly porous pure carbon material with multifractal structures. This material is prepared by the vacuum carbonization of a zinc-based metal-organic framework, which demonstrates an ultrahigh lithium storage capacity of 2458 mAh g(-1) and a favorable high-rate performance...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28074203/multitopic-ligand-directed-assembly-of-low-dimensional-metal-chalcogenide-organic-frameworks
#16
Yi Liu, Kaiqi Ye, Yue Wang, Qichun Zhang, Xianhui Bu, Pingyun Feng
Despite tremendous progress in metal-organic frameworks, only limited success has been achieved with metal-chalcogenide organic frameworks. Metal-chalcogenide organic frameworks are desirable because they offer a promising route towards tunable semiconducting porous frameworks. Here, four novel semiconducting chalcogenide-organic hybrid compounds have been synthesized through a solvothermal method. Multitopic organic molecules, i.e., 1,2-di-(4-pyridyl)ethylene (L(1)), 1,3,5-tris(4-pyridyl-trans-ethenyl)benzene (L(2)) and tetrakis(4-pyridyloxymethylene)methane (L(3)), have been used as linkers to assemble Zn(SAr)2 or Zn2(SAr)4 units to generate different patterns of spatial organizations...
January 11, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28072870/mathematical-modeling-of-intestinal-iron-absorption-using-genetic-programming
#17
Andrea Colins, Ziomara P Gerdtzen, Marco T Nuñez, J Cristian Salgado
Iron is a trace metal, key for the development of living organisms. Its absorption process is complex and highly regulated at the transcriptional, translational and systemic levels. Recently, the internalization of the DMT1 transporter has been proposed as an additional regulatory mechanism at the intestinal level, associated to the mucosal block phenomenon. The short-term effect of iron exposure in apical uptake and initial absorption rates was studied in Caco-2 cells at different apical iron concentrations, using both an experimental approach and a mathematical modeling framework...
2017: PloS One
https://www.readbyqxmd.com/read/28072527/rational-synthesis-and-investigation-of-porous-metal-organic-framework-materials-from-a-preorganized-heterometallic-carboxylate-building-block
#18
Aleksandr A Sapianik, Ekaterina N Zorina-Tikhonova, Mikhail A Kiskin, Denis G Samsonenko, Konstantin A Kovalenko, Alexey A Sidorov, Igor L Eremenko, Danil N Dybtsev, Alexander J Blake, Stephen P Argent, Martin Schröder, Vladimir P Fedin
The tetranuclear heterometallic complex [Li2Zn2(piv)6(py)2] (1, where piv(-) = pivalate and py = pyridine) has been successfully employed as a presynthesized node for the construction of four porous metal-organic frameworks (MOFs) [Li2Zn2(R-bdc)3(bpy)]·solv (2-R, R-bdc(2-); R = H, Br, NH2, NO2) by reaction with 4,4'-bipyridine (bpy) and terephthalate anionic linkers. The [Li2Zn2] node is retained in the products, representing a rare example of the rational step-by-step design of isoreticular MOFs based on complex heterometallic building units...
January 10, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28071884/carbon-coated-fe3o4-vox-hollow-microboxes-derived-from-metal-organic-frameworks-as-a-high-performance-anode-material-for-lithium-ion-batteries
#19
Zhi-Wei Zhao, Tao Wen, Kuang Liang, Yi-Fan Jiang, Xiao Zhou, Cong-Cong Shen, An-Wu Xu
As the ever-growing demand for high-performance power sources, lithium-ion batteries with high storage capacities and outstanding rate performance have been widely considered as a promising storage device. In this work, starting with metal-organic frameworks (MOFs), we have developed a facile approach to the synthesis of hybrid Fe3O4/VOx hollow microboxes via the process of hydrolysis and ion exchange and subsequent calcination. In the constructed architecture, the hollow structure provides efficient lithium ions diffusion pathway and extra space to accommodate the volume expansion during the insertion and extration of Li+...
January 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28067353/biomimetic-mineralization-of-metal-organic-frameworks-around-polysaccharides
#20
Kang Liang, Ru Wang, Manon Boutter, Cara M Doherty, Xavier Mulet, Joseph J Richardson
Biomimetic mineralization exploits natural biomineralization processes for the design and fabrication of synthetic functional materials. Here, we report for the first time the use of carbohydrates (polysaccharides) for the biomimetic crystallization of metal-organic frameworks. This discovery greatly expands the potential and diversity of biomimetic approaches for the design, synthesis, and functionalization of new bio-metal-organic framework composite materials.
January 19, 2017: Chemical Communications: Chem Comm
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