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https://www.readbyqxmd.com/read/28453264/polymorphous-al-mofs-based-on-v-shaped-linker-molecules-synthesis-properties-and-in-situ-investigation-of-their-crystallization
#1
Martin Krüger, A Ken Inge, Helge Reinsch, Yuan-Han Li, Mohammad Wahiduzzaman, Chia-Her Lin, Sue-Lein Wang, Guillaume Maurin, Norbert Stock
The in situ and systematic high-throughput investigation of the system Al(3+)/4,4'-benzophenonedicarboxylic acid (H2BPDC)/DMF/H2O in the presence of various additives was carried out, and a new Al-MOF of composition [Al(OH)(BPDC)], denoted as CAU-21-BPDC, was obtained. Its crystal structure was determined from single-crystal X-ray diffraction data (space group I422, a = b = 17.2528(7) Å, c = 23.864(1) Å). The structure is built up by octanuclear rings of cis corner-sharing AlO6 polyhedra forming the inorganic building unit (IBU)...
April 28, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28448879/adsorption-of-organic-arsenic-acids-from-water-over-functionalized-metal-organic-frameworks
#2
Mithun Sarker, Ji Yoon Song, Sung Hwa Jhung
Organic arsenic acids (OAAs) are regarded as water pollutants because of their toxicity and considerable solubility in water. Adsorption of OAAs such as phenylarsonic acid (PAA) and p-arsanilic acid (ASA) from water was investigated over functionalized (with OH groups) metal-organic framework (MOF, MIL-101), as well as over pristine MIL-101 and commercial activated carbon. The highly porous MIL-101 bearing three hydroxyl groups (MIL-101(OH)3) exhibited remarkable PAA and ASA adsorption capacities. Based on the effects of pH on PAA and ASA adsorption, hydrogen bonding was suggested as a plausible mechanism of OAA adsorption...
April 19, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28448833/facile-green-synthesis-of-a-co3v2o8-nanoparticle-electrode-for-high-energy-lithium-ion-battery-applications
#3
Vaiyapuri Soundharrajan, Balaji Sambandam, Jinju Song, Sungjin Kim, Jeonggeun Jo, Pham Tung Duong, Seokhun Kim, Vinod Mathew, Jaekook Kim
In the present study, a metal-organic framework (MOF) derived from a facile water-assisted green precipitation technique is employed to synthesize phase-pure cobalt vanadate (Co3V2O8, CVO) anode for lithium-ion battery (LIB) application. The material obtained by this eco-friendly method is systematically characterized using various techniques such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and N2 adsorption-desorption measurements...
April 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28447910/chemical-and-biological-assessment-of-metal-organic-frameworks-mofs-in-pulmonary-cells-and-in-an-acute-in-vivo-model-relevance-to-pulmonary-arterial-hypertension-therapy
#4
Nura Adam Mohamed, Robert P Davies, Paul D Lickliss, Blerina Ahmetaj-Shala, Daniel M Reed, Hime H Gashaw, Hira Saleem, Gemma R Freeman, Peter M George, John Wort, Daniel Morales-Cano, Bianca Barreira, Teresa D Tetley, Adrian H Chester, Magdi Yacoub, Nicholas S Kirkby, Laura Moreno, Jane A Mitchell
No abstract text is available yet for this article.
January 1, 2017: Pulmonary Circulation
https://www.readbyqxmd.com/read/28447096/the-effect-of-k-cations-on-the-phase-transitions-and-structural-dielectric-and-luminescence-properties-of-cat-k0-5cr0-5-hcoo-3-where-cat-is-protonated-dimethylamine-or-ethylamine
#5
Maciej Ptak, Anna Gągor, Adam Sieradzki, Bartosz Bondzior, Przemysław Dereń, Aneta Ciupa, M Trzebiatowska, Mirosław Mączka
We report the synthesis, crystal structure, and dielectric, vibrational and emission spectra of two novel heterometallic perovskite-type metal-organic frameworks (MOFs) of the following formula: [(CH3)2NH2][K0.5Cr0.5(HCOO)3] (DMAKCr) and [C2H5NH3][K0.5Cr0.5(HCOO)3] (EtAKCr). DMAKCr crystallizes in a trigonal structure (R3[combining macron] space group) and undergoes an order-disorder phase transition to the monoclinic system (P1[combining macron] space group) at about 190 K. The dielectric studies confirm the presence of first-order relaxor-like structural transformation...
April 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28445640/a-highly-active-and-stable-fe-n-c-catalyst-for-oxygen-depolarized-cathode-applications
#6
Jingkun Li, Qingying Jia, Shraboni Ghoshal, Wentao Liang, Sanjeev Mukerjee
Anion immunity towards oxygen reduction reaction (ORR) has tremendous implications in electrocatalysis with applications for fuel cells, metal-air batteries, and oxygen depolarized cathodes (ODCs) in anodic evolution of chlorine. The necessity for exploring ORR catalysts with immunity to anion adsorption is particularly significant considering that platinum group metal (PGM) catalysts are costly and highly vulnerable to impurities such as halides. Herein, we report a metal organic framework (MOF) derived Fe-N-C catalyst that exhibits a dramatically improved half-wave potential of 240 mV compared to the state-of-the-art RhxSy/C catalyst in a rotating disk electrode in the presence of Cl-...
April 26, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28444822/triplex-dna-nanostructures-from-basic-properties-to-applications
#7
Yuwei Hu, Alessandro Cecconello, Andrea Idili, Francesco Ricci, Itamar Willner
Triplex nucleic acids attract recent interest as part of the rich "tool-box" of structures used to develop DNA-based nanostructures and materials. This review addresses the use of DNA triplexes to assemble sensing platforms and molecular switches. Furthermore, the pH-induced, switchable assembly and dissociation of triplex DNA-bridged nanostructures are presented. Specifically, the aggregation/deaggregation of nanoparticles and the reversible oligomerization of "origami" tiles or DNA circles are described. Also, the use of triplex-DNA structures as functional units to assemble pH-responsive systems and materials are presented...
April 26, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28443895/diamondoid-structured-polymolybdate-based-metal-organic-frameworks-as-high-capacity-anodes-for-lithium-ion-batteries
#8
Yuan-Yuan Wang, Mi Zhang, Shun-Li Li, Shu-Ran Zhang, Wei Xie, Jun-Sheng Qin, Zhong-Min Su, Ya-Qian Lan
Two novel isostructural polyoxometalate (POM)-based metal-organic frameworks (MOFs) with diamond topology, NENU-506 and NENU-507, were hydrothermally synthesized. They not only combine the advantages of both POMs and MOFs, but also show excellent chemical and thermal stability. Notably, NENU-507 exhibited a high reversible capacity of 640 mA h g(-1) after 100 cycles when applied as an anode material in lithium-ion batteries.
April 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28443865/simultaneous-use-of-mofs-mil-101-cr-and-zif-11-in-thin-film-nanocomposite-membranes-for-organic-solvent-nanofiltration
#9
Carlos Echaide-Górriz, Marta Navarro, Carlos Téllez, Joaquín Coronas
The MOFs Cr carboxylate MIL-101(Cr) and Zn imidazolate ZIF-11 have different chemical and textural properties. These properties have been combined to prepare thin film nanocomposite (TFN) membranes for organic solvent nanofiltration (OSN) with the two MOFs simultaneously embedded in the same membrane. The TFN membrane containing only ZIF-11 permeated faster than that with only MIL-101(Cr) when filtering sunset yellow (SY) (4.9 L m(-2) h(-1) bar(-1)) and acridine orange (AO) (3.2 L m(-2) h(-1) bar(-1)), although MIL-101(Cr) alone gave rise in both cases to better rejections (above 90%)...
April 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28443854/infrared-laser-writing-of-mofs
#10
K Hirai, K Sada
An infrared (IR) laser machine is used for the synthesis of metal-organic frameworks (MOFs). Solutions containing metal ions and organic ligands are casted on glass substrates. MOF crystals are formed at the positions the IR laser irradiated, resulting in the patterning of MOFs.
April 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28442774/designed-synthesis-of-a-one-for-two-hydrophilic-magnetic-amino-functionalized-metal-organic-framework-for-highly-efficient-enrichment-of-glycopeptides-and-phosphopeptides
#11
Yiqin Xie, Chunhui Deng
Highly efficient enrichment of glycopeptides or phosphopeptides from complex biological samples is indispensable for high-throughput mass spectrometry analysis. In this study, for the first time, a "one for two" hydrophilic magnetic amino-functionalized metal-organic framework (MOF) was designed and synthesized for selective enrichment of both glycopeptides and phosphopeptides. A well-known solvo-thermal reaction was adopted to prepare a magnetic core Fe3O4, followed by self- polymerization of dopamine, creating a polydopamine (PDA) onto Fe3O4...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28440630/a-hydrolytically-stable-luminescent-cationic-metal-organic-framework-for-highly-sensitive-and-selective-sensing-of-chromate-anion-in-natural-water-systems
#12
Wei Liu, Yanlong Wang, Zhuanling Bai, Yuxiang Li, Yaxing Wang, Lanhua Chen, Lin Xu, Juan Diwu, Zhifang Chai, Shuao Wang
The effective detection of chromate anion in aqueous solution is highly desirable due to its high solubility, environmental mobility, carcinogenicity, and bioaccumulation effect. New strategy for precise detection of chromate anion in the presence of large excess of other anions such as Cl-, NO3-, HCO3- in drinking water and natural water systems remains a challenge. Herein, a hydrolytically stable cationic luminescent europium(III) based metal organic framework (MOF) 1 is successfully synthesized and investigated as a luminescent sensor which exhibits instant and selective luminescence quenching property toward CrO42- in aqueous solutions...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28440621/gas-phase-sensing-of-alcohols-by-metal-organic-framework-polymer-composite-materials
#13
Sumit Sachdeva, Sander J H Koper, Anahid Sabetghadam, Dimitri Soccol, Dirk J Gravesteijn, Freek Kapteijn, Ernst J R Sudhölter, Jorge Gascon, Louis C P M de Smet
Affinity layers play a crucial role in chemical sensors for the selective and sensitive detection of analytes. Here, we report the use of composite affinity layers containing Metal Organic Frameworks (MOFs) in a polymeric matrix for sensing purposes. Nanoparticles of NH2-MIL-53(Al) were dispersed in a Matrimid polymer matrix with different weight ratios (0-100 wt %) and drop-casted on planar capacitive transducer devices. These coated devices were electrically analyzed using impedance spectroscopy and investigated for their sensing properties toward the detection of a series of alcohols and water in the gas phase...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28440615/monolith-supported-amine-functionalized-mg2-dobpdc-adsorbents-for-co2-capture
#14
Lalit A Darunte, Yuri Terada, Christopher R Murdock, Krista S Walton, David S Sholl, Christopher W Jones
The potential of using an amine-functionalized MOF, mmen-M2(dobpdc) (M = Mg, Mn), supported on a structured monolith contactor for CO2 capture from simulated flue gas is explored. The stability of the unsupported MOF powders under humid conditions is explored using nitrogen physisorption and X-ray diffraction analysis before and after exposure to humidity. Based on its superior stability to humidity, mmen-Mg2(dobpdc) is selected for further growth on a honeycomb cordierite monolith that is washcoated with α-alumina...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28440386/effect-of-chemical-structure-of-s-nitrosothiols-on-nitric-oxide-release-mediated-by-the-copper-sites-of-a-metal-organic-framework-based-environment
#15
Kiara Taylor-Edinbyrd, Tanping Li, Revati Kumar
The effect of chemical structure of different biologically compatible S-nitrosothiols on the solvation environment at catalytic copper sites in a metal organic framework (MOF) suspended in a solution of ethanol is probed using computational methods. The use of a copper based MOF as a storage vehicle and catalyst (copper sites of the MOF) in the controlled and sustained release of chemically stored nitric oxide (NO) from S-nitrosocysteine has been shown to occur both experimentally and computationally [J. Am...
April 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28437071/revealing-the-initial-reaction-behavior-in-the-continuous-synthesis-of-metal-organic-frameworks-using-real-time-synchrotron-x-ray-analysis
#16
Angelos Polyzoidis, Martin Etter, Michael Herrmann, Stefan Loebbecke, Robert E Dinnebier
In recent years, continuous process technologies have attracted increasing attention, as a means of overcoming limitations in the repeatability and reproducibility of metal-organic framework (MOF) synthesis. Research in this area, however, has neglected to provide insight into the phenomenon leading to the formation of MOFs. In this work, we report the adaption of high-energy synchrotron powder X-ray diffraction analysis to a continuous ZIF-8 production process for online monitoring of the reaction behavior and crystallite formation during the first seconds of the MOF synthesis...
April 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28436661/performance-of-van-der-waals-corrected-functionals-for-guest-adsorption-in-the-m2-dobdc-metal-organic-frameworks
#17
Bess Vlaisavljevich, Johanna M Huck, Zeric Hulvey, Kyuho Lee, Jarad A Mason, Jeffrey B Neaton, Jeffrey R Long, Craig M Brown, Dario Alfè, Angelos Michaelides, Berend Smit
Small molecule binding in metal-organic frameworks (MOFs) can be accurately studied both experimentally and computationally, provided the proper tools are employed. Herein, we compare and contrast properties associated with guest binding by means of density functional theory (DFT) calculations using nine different functionals for the M2(dobdc) (dobdc4- = 2,5-dioxido,1,4-benzenedicarboxylate) series where M = Mg, Mn, Fe, Co, Ni, Cu, and Zn. Additionally, we perform Quantum Monte Carlo (QMC) calculations for one system to determine if this method can be used to assess the performance of DFT...
April 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28436067/significant-enhancement-of-c2-h2-c2-h4-separation-by-a-photochromic-diarylethene-unit-a-temperature-and-light-responsive-separation-switch
#18
Cong Bin Fan, Le Le Gong, Ling Huang, Feng Luo, Rajamani Krishna, Xian Feng Yi, An Min Zheng, Le Zhang, Shou Zhi Pu, Xue Feng Feng, Ming Biao Luo, Guo Cong Guo
A dual temperature- and light-responsive C2 H2 /C2 H4 separation switch in a diarylethene metal-organic framework (MOF) is presented. At 195 K and 100 kPa this MOF shows ultrahigh C2 H2 /C2 H4 selectivity of 47.1, which is almost 21.4 times larger than the corresponding value of 2.2 at 293 K and 100 kPa, or 15.7 times larger than the value of 3.0 for the material under UV at 195 K and 100 kPa. The origin of this unique control in C2 H2 /C2 H4 selectivity, as unveiled by density functional calculations, is due to a guest discriminatory gate-opening effect from the diarylethene unit...
April 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28435777/recent-progress-in-metal-organic-frameworks-for-applications-in-electrocatalytic-and-photocatalytic-water-splitting
#19
REVIEW
Wei Wang, Xiaomin Xu, Wei Zhou, Zongping Shao
The development of clean and renewable energy materials as alternatives to fossil fuels is foreseen as a potential solution to the crucial problems of environmental pollution and energy shortages. Hydrogen is an ideal energy material for the future, and water splitting using solar/electrical energy is one way to generate hydrogen. Metal-organic frameworks (MOFs) are a class of porous materials with unique properties that have received rapidly growing attention in recent years for applications in water splitting due to their remarkable design flexibility, ultra-large surface-to-volume ratios and tunable pore channels...
April 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28435715/the-silver-i-nitrate-complex-of-the-ligand-n-pyridin-2-ylmeth-yl-pyrazine-2-carboxamide-a-metal-organic-framework-mof-structure
#20
Dilovan S Cati, Helen Stoeckli-Evans
The reaction of silver(I) nitrate with the mono-substituted pyrazine carboxamide ligand, N-(pyridin-2-ylmeth-yl)pyrazine-2-carboxamide (L), led to the formation of the title compound with a metal-organic framework (MOF) structure, [Ag(C11H10N4O)(NO3)] n , poly[μ-nitrato-[μ-N-(pyridin-2-ylmethyl-κN)pyrazine-2-carboxamide-κN(4)]silver(I)]. The silver(I) atom is coordinated by a pyrazine N atom, a pyridine N atom, and two O atoms of two symmetry-related nitrate anions. It has a fourfold N2O2 coordination sphere, which can be described as distorted trigonal-pyramidal...
April 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
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