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https://www.readbyqxmd.com/read/28937742/inorganic-nanoparticles-metal-organic-framework-hybrid-membrane-reactors-for-efficient-photocatalytic-conversion-of-co2
#1
James Wainaina Maina, Jurg Schutz, Luke Grundy, Elise Des Ligneris, Zhifeng Yi, Lingxue Kong, Cristina Pozo-Gonzalo, Mihail Ionescu, Ludovic F Dumée
Photocatalytic conversion of carbon dioxide (CO2) to useful products has potential to address the adverse environmental impact of global warming. However, most photocatalysts used to date exhibit limited catalytic performance, due to poor CO2 adsorption capacity, inability to efficiently generate photoexcited electrons, and/or poor transfer of the photo-generated electrons to CO2 molecules adsorbed on the catalyst surface. The integration of inorganic semiconductor nanoparticles across metal organic framework (MOF) materials has potential to yield new hybrid materials, combining high CO2 adsorption capacity of MOF and the ability of the semiconductor nanoparticles to generate photoexcited electrons...
September 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28936584/preparation-of-magnetic-mil-101-cr-for-efficient-removal-of-ciprofloxacin
#2
Şahika Sena Bayazit, Selen Tuğba Danalıoğlu, Mohamed Abdel Salam, Özge Kerkez Kuyumcu
Metal organic frameworks are widely used as adsorbent materials in recent years. In this study, the most prepared metal organic framework MIL-101 was prepared by hydrothermal method and featured magnetic property using co-precipitation method Fe3O4. Then, the prepared composite (MIL-101/Fe3O4) was first characterized using XRD, FTIR, SEM-EDS, and surface area analysis, then was used for the adsorptive removal of the most used antibiotic, ciprofloxacin (CIP). The effect of different adsorption variables which may affect the removal of CIP by MIL-101/Fe3O4 was investigated, as well as their adsorbent quantity, initial CIP concentration, pH, temperature, and contact time...
September 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28936534/tuneable-nature-of-metal-organic-frameworks-as-heterogeneous-solid-catalysts-for-alcohol-oxidation
#3
Amarajothi Dhakshinamoorthy, Abdullah M Asiri, Hermenegildo Garcia
Selective benzyl alcohol oxidation (BA) to benzaldehyde has been frequently used as a benchmark reaction to evaluate the catalytic activity of metal organic frameworks (MOFs) as oxidation catalysts. Substituted BAs, and aliphatic and allylic alcohols have also been often used as substrates in these studies. In the present review, the current state of the art of MOFs as heterogeneous catalysts for the oxidation of BA and other alcohols is described, grouping the reports according to the nature of the active sites present on the MOFs...
September 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28936514/on-the-elusive-nature-of-oxygen-binding-at-coordinatively-unsaturated-3d-transition-metal-centers-in-metal-organic-frameworks
#4
Mali H Rosnes, Denis Sheptyakov, Alexandra Franz, Matthias Frontzek, Pascal D C Dietzel, Peter A Georgiev
Using gas sorption measurements at ambient temperatures and in situ neutron powder diffraction methods, we have studied the interaction strengths and coordination geometries of O2 and N2 near the non-occupied coordination site (open metal site) in the isostructural MOF structures of the CPO-27-M/M-MOF-74 series (with M = Co, Ni, Mn and Cu). Our experimental observations are compared to periodic quantum chemical model calculations. Contrary to recent computational studies, our results, both experimental and theoretical, unequivocally suggest rather weak interactions between the M(ii) coordinatively unsaturated centers and the adsorbate molecules, being mainly dispersive and electrostatic in nature...
September 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28935769/mof-derived-cobalt-nanoparticles-catalyze-a-general-synthesis-of-amines
#5
Rajenahally V Jagadeesh, Kathiravan Murugesan, Ahmad S Alshammari, Helfried Neumann, Marga-Martina Pohl, Jörg Radnik, Matthias Beller
The development of base metal catalysts for the synthesis of pharmaceutically relevant compounds remains an important goal of chemical research. Here, we report that cobalt nanoparticles encapsulated by a graphitic shell are broadly effective reductive amination catalysts. Their convenient and practical preparation entailed template assembly of cobalt-diamine-dicarboxylic acid metal organic frameworks on carbon and subsequent pyrolysis under inert atmosphere. The resulting stable and reusable catalysts were active for synthesis of primary, secondary, tertiary and N-methylamines (>140 examples)...
September 21, 2017: Science
https://www.readbyqxmd.com/read/28933555/a-water-stable-cl-ag14-cluster-based-metal-organic-open-framework-for-dichromate-trapping-and-bacterial-inhibition
#6
Shan-Shan Zhang, Xin Wang, Hai-Feng Su, Lei Feng, Zhi Wang, Wen-Qiang Ding, Vladislav A Blatov, Mohamedally Kurmoo, Chen-Ho Tung, Di Sun, Lan-Sun Zheng
Decoding the principles of cluster-based framework assembly at the molecular level remains a persistent challenge. Herein, we isolated and characterized a novel water-stable three-dimensional (3D) metal-organic open framework [Cl@Ag14(cPrC≡C)10Cl2·(p-TOS)·1/3H2O]n (SD/Ag14, cPrC≡CH = cyclopropylacetylene; p-TOS = p-toluenesulfonate), which contains a chloride-templated Ag14 cluster as building block. For SD/Ag14, one chloride acts as the template to shape the Ag14 cluster and the other bridges the clusters to a 3D pcu-h open framework...
September 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28932854/salen-co-iii-imprisoned-within-pores-of-a-metal-organic-framework-by-post-synthetic-modification-and-its-asymmetric-catalysis-for-co2-fixation-at-room-temperature
#7
Danping Chen, Ran Luo, Meiyan Li, Mengqi Wen, Yan Li, Chao Chen, Ning Zhang
Herein, a new preparation strategy of chiral metal-organic frameworks (CMOFs) has been demonstrated. By adsorption and then post-synthetically modified (PSM) procedures, chiral salen(Co(iii)) could be imprisoned within the cages of an MOF and remained in its free form. This is the first report on the successful application of CMOFs in heterogeneous asymmetric catalysis for coupling CO2 with epoxides to obtain optically active cyclic carbonates at room temperature.
September 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28932404/crystalexplorer-model-energies-and-energy-frameworks-extension-to-metal-coordination-compounds-organic-salts-solvates-and-open-shell-systems
#8
Campbell F Mackenzie, Peter R Spackman, Dylan Jayatilaka, Mark A Spackman
The application domain of accurate and efficient CE-B3LYP and CE-HF model energies for intermolecular interactions in molecular crystals is extended by calibration against density functional results for 1794 molecule/ion pairs extracted from 171 crystal structures. The mean absolute deviation of CE-B3LYP model energies from DFT values is a modest 2.4 kJ mol(-1) for pairwise energies that span a range of 3.75 MJ mol(-1). The new sets of scale factors determined by fitting to counterpoise-corrected DFT calculations result in minimal changes from previous energy values...
September 1, 2017: IUCrJ
https://www.readbyqxmd.com/read/28929762/modulating-the-performance-of-an-asymmetric-organocatalyst-by-tuning-its-spatial-environment-in-a-metal-organic-framework
#9
Lujia Liu, Tian-You Zhou, Shane G Telfer
Systematically tuning the spatial environment around the active sites of synthetic catalysts is a difficult challenge. Here, we show how this can be accomplished in the pores of multicomponent metal-organic frameworks. This relies on embedding a catalytic unit in a pore of the MUF-77 framework and then tuning its environment by introducing different functional groups to the surrounding linkers. This approach benefits from the structural regularity of MUF-77, which places each component in a precise location to circumvent disorder...
September 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28929746/atomic-layer-deposition-of-rhenium-aluminum-oxide-thin-films-and-reox-incorporation-in-a-metal-organic-framework
#10
Martino Rimoldi, Joseph T Hupp, Omar K Farha
Methyltrioxorhenium (ReO3Me) is introduced as the first rhenium atomic layer deposition (ALD) precursor and used to grow rhenium aluminum oxide thin films in combination with trimethylaluminum (TMA - AlMe3). The growth rate of the smooth Re-Al oxide films, with general stoichiometry RexAlyO3x, has been monitored by in situ quartz crystal microbalance (QCM) and ex situ ellipsometry, and found to be 3.2 Å/cycle. X-ray photoelectron spectroscopy (XPS) revealed the mixed valent composition of the film with Re(III) species being the main component...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929371/exploration-of-zr-metal-organic-framework-as-efficient-photocatalyst-for-hydrogen-production
#11
Zhiliang Jin, Hao Yang
The application of metal-organic framework (MOF) in the field of photocatalysis is limited, because of its unstable chemical properties and failure to respond in visible light. Herein, the Pd/MOF catalysts were prepared by impregnation reduction. It is important that we have reasonably constructed the dye-sensitized system of Pd/MOF and successfully extended the application of MOF to the visible range. It exhibited maximal photocatalytic activity (9.43 mmol/g) under visible-light irradiation (λ ≥ 420 nm) with eosin Y as a photo-sensitizer, which was enhanced twice the order of magnitude compared with the pure MOF (0...
September 19, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28929153/two-dimensional-metal-organic-frameworks-with-high-oxidation-states-for-efficient-electrocatalytic-urea-oxidation
#12
Dongdong Zhu, Chunxian Guo, Jinlong Liu, Liang Wang, Yi Du, Shi-Zhang Qiao
A two-dimensional metal-organic framework (MOF) comprising nickel species and an organic ligand of benzenedicarboxylic acid is fabricated and explored as an electrocatalyst for urea oxidation reaction (UOR). The excellent UOR performance is found to be partially due to the high active site density of the two-dimensional MOF, and largely because of the high oxidation state of the nickel species.
September 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28926222/degradation-of-paraoxon-and-the-chemical-warfare-agents-vx-tabun-and-soman-by-the-metal-organic-frameworks-uio-66-nh2-mof-808-nu-1000-and-pcn-777
#13
Martijn C de Koning, Marco van Grol, Troy Breijaert
In recent years, Zr-based metal-organic frameworks (MOFs) have been developed that facilitate catalytic degradation of toxic organophosphate agents, such as chemical warfare agents (CWAs). Because of strict regulations, experiments using live agents are not possible for most laboratories and, as a result, simulants are used in the majority of cases. Reports that employ real CWAs are scarce and do not cover the whole spectrum of agents. We here present a comparative study in which UiO-66-NH2, NU-1000, MOF-808, and PCN-777 are evaluated for their effectiveness in the degradation of paraoxon and the chemical warfare agents tabun, VX, and soman, in N-ethylmorpholine buffer (pH 10) as well as in pure water...
September 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28926054/efficient-incorporation-of-diverse-components-into-metal-organic-frameworks-via-metal-phenolic-networks
#14
Yangke Long, Ling Xiao, Qihua Cao, Xiaowen Shi, Yunan Wang
Metal phenolic networks (MPNs) were used for the first time for the construction of core@shell MOF materials. Diverse functional nanocores with different shapes and sizes could be coated with ZIF-8 shells mediated by MPNs. The obtained Fe3O4@TA-Fe(3+)@ZIF-8 powder showed a superhydrophobic nature which could efficiently absorb n-hexane from water.
September 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28926046/long-range-magnetic-ordering-in-a-metal-organic-framework-based-on-octanuclear-nickel-ii-clusters
#15
Jun-Li Wang, Yan Bai, Hui Pan, Guang-Shui Zheng, Dong-Bin Dang
A novel three-dimensional metal-organic framework [Ni3(BTC)2(bpp)2(H2O)]·3H2O (1) based on mixed ligands H3BTC (1,2,4-benzenetricarboxylic acid) and bpp (1,3-bis(4-pyridyl)propane) was obtained under hydrothermal conditions. Crystal structure analysis reveals that 1 is a framework based on cage-like Ni8(COO)12 units. Furthermore, long-range magnetic ordering is observed at low temperature.
September 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28925520/rational-design-of-bifunctional-2-fold-interpenetrated-zn-ii-metal-organic-framework-for-selective-adsorption-of-co2-and-efficient-aqueous-phase-sensing-of-2-4-6-trinitrophenol
#16
C M Nagaraja, Sandeep Dhankhar, Nayuesh Sharma, Sandeep Kumar, Dhilip Kumar
A bifunctional, microporous Zn(II) metal-organic framework, [Zn2(NH2BDC)2(dpNDI)]n (MOF1) (where, NH2BDC =2-aminoterephthalic acid, dpNDI =N,N'-di(4-pyridyl)-1,4,5,8-naphthalenediimide) has been synthesized solvothermally. MOF1 shows a 2-fold interpenetrated, 3D pillar-layered framework structure composed of two types of 1D channels with dimensions of ~3.80 x 16.9 Å2 and 7.49 x 17.01 Å2 decorated with pendent -NH2 group. Owing to the presence of basic functionalized pore surface, MOF1 exhibits selective adsorption of CO2 with high value of heat of adsorption (Qst = 46...
September 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28925254/tuning-the-endocytosis-mechanism-of-zr-based-mofs-through-linker-functionalisation
#17
Claudia Orellana-Tavra, Salame Haddad, Ross J Marshall, Isabel Abanades Lazaro, Gerard Boix, Inhar Imaz, Daniel Maspoch, Ross S Forgan, David Fairen-Jimenez
A critical bottleneck for the use of metal-organic frameworks (MOFs) as drug delivery systems has been allowing them to reach their intracellular targets without being degraded in the acidic environment of the lysosomes. Cells take up particles by endocytosis through multiple biochemical pathways, and the fate of these particles depends on these routes of entry. Here, we show the effect of functional group incorporation into a series of Zr-based MOFs on their endocytosis mechanisms, allowing us to design an effi-cient drug delivery system...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28924211/hydrogen-bonds-to-au-atoms-in-coordinated-gold-clusters
#18
Md Abu Bakar, Mizuho Sugiuchi, Mitsuhiro Iwasaki, Yukatsu Shichibu, Katsuaki Konishi
It is well known that various transition elements can form M···H hydrogen bonds. However, for gold, there has been limited decisive experimental evidence of such attractive interactions. Herein we demonstrate an example of spectroscopically identified hydrogen bonding interaction of C-H units to Au atoms in divalent hexagold clusters ([Au6](2+)) decorated by diphosphine ligands. X-ray crystallography reveals substantially short Au-H/Au-C distances to indicate the presence of attractive interactions involving unfunctionalized C-H moieties...
September 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28922485/novel-3d-semiconducting-open-frameworks-based-on-cuprous-bromides-with-visible-light-driven-photocatalytic-properties
#19
Xiao-Wu Lei, Cheng-Yang Yue, Jun-Chao Wei, Rui-Qing Li, Fu-Qi Mi, Yan Li, Lu Gao, Quan-Xiu Liu
Visible light driven photocatalysts based on crystalline microporous metal halogenides received much less attention compared with dense or composite oxide semiconductors. Using the well-known photosensitive transition metal-complexes [TM(2,2-bipy)3 ](2+) (TM=Fe, Co, Ni, Ru) as templates, a special three-dimensional (3D) metal halogenide framework of [TM(2,2-bipy)3 ]Cu4 Br6 was designed with [Cu4 Br4 ] cluster as 4-connected node. These microporous materials feature narrow band gaps and stable visible light driven photocatalytic properties including water reduction to provide H2 and photodegradation of organic pollutants...
August 9, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28920997/rapid-and-highly-sensitive-detection-of-extracellular-and-intracellular-h2s-by-an-azide-functionalized-al-iii-based-metal-organic-framework
#20
Soutick Nandi, Helge Reinsch, Sooram Banesh, Norbert Stock, Vishal Trivedi, Shyam Biswas
A new, azide-functionalized Al(iii)-based metal-organic framework (MOF) denoted as CAU-10-N3 (1, CAU = Christian-Albrechts-University) and consisting of the 5-azido-isophthalic acid (H2IPA-N3) ligand was employed as a reaction-based fluorescent turn-on probe for the detection of H2S. The activated compound (1') showed fast, selective and highly sensitive sensing properties for extracellular H2S in HEPES buffer (10 mM, pH = 7.4). The material retained its high selectivity even in the presence of possibly competing biological species...
September 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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