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https://www.readbyqxmd.com/read/29792413/conductive-metal-organic-frameworks-as-ion-to-electron-transducers-in-potentiometric-sensors
#1
Lukasz Mendecki, Katherine A Mirica
This paper describes an unexplored property of conductive metal-organic frameworks (MOFs) as ion-to-electron transducers in the context of potentiometric detection. Several conductive two-dimensional MOF analogues were drop-cast onto a glassy carbon electrode and then covered with an ion-selective membrane to form a potentiometric sensor. The resulting devices exhibited excellent sensing properties toward anions and cations, characterized by a near-Nernstian response and over 4 orders of magnitude linear range...
May 24, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29790877/two-dimensional-porous-cuprous-oxide-nanoplatelets-derived-from-metal-organic-frameworks-mofs-for-efficient-photocatalytic-dye-degradation-under-visible-light
#2
Yifan Lin, Hao Wan, Fashen Chen, Xiaohe Liu, Renzhi Ma, Takayoshi Sasaki
Bottom-up synthesis is a promising method to design and control the morphology of metal-organic frameworks (MOFs). Here, square shaped two-dimensional (2D) MOF nanoplatelets with a thickness of ∼80 nm and a lateral dimension of 4-6 μm were successfully synthesized through a facile solvothermal treatment of Cu(NO3)2 and 4,4'-bipyridine in the presence of polyvinyl pyrrolidone (PVP). The growth of a cross-weaved structure assembled via 1D chains linked with 4,4'-bipyridine along the layer stacking direction was hindered by PVP, resulting in a high-aspect ratio of the nanoplatelets...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29790730/energy-saving-synthesis-of-mof-derived-hierarchical-and-hollow-co-vo3-2-co-oh-2-composite-leaf-arrays-for-supercapacitor-electrode-materials
#3
Yingxi Zhang, Hao Chen, Cao Guan, Yatao Wu, Chunhai Yang, Zhehong Shen, Qichao Zou
A one-step and energy-saving method was proposed to synthesize hierarchical and hollow Co(VO3)2-Co(OH)2 composite leaf arrays on carbon cloth, which expressed high capacitance (522 mF cm-2 or 803 F g-1 at the current density of 0.5 mA cm-2), good rate capability (79.5% capacitance retention after a 30-fold increase of the current density) and excellent cycling stability (90% capacitance retention after 15 000 charge-discharge cycles) when tested as a supercapacitor electrode.
May 23, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29790549/a-mof-derived-method-to-construct-well-arranged-porous-nanosheets-for-lithium-ion-batteries
#4
JinCheng Du, YuHai Tang, Yu Wang, PengHui Shi, JinChen Fan, QunJie Xu, YuLin Min
In this work, we report a facile route to fabricate a ZnCo2O4 nanosheet derived from metal-organic frameworks. The as-prepared ZnCo2O4 nanosheet material for lithium-ion batteries shows an excellent electrochemical performance. The obtained ZnCo2O4 nanosheet delivers a high reversible capacity of 1640.8 mA h g-1 at a current density of 100 mA g-1 after 50 cycles. More importantly, even at a current density of 1500 mA g-1, the electrode material still exhibits a discharge capacity of 581.3 mA h g-1 after 190 cycles...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29790543/a-bi-metallic-mof-catalyst-via-sensitive-detection-adsorption-of-fe-3-ions-for-size-selective-reaction-prompting
#5
Yang Li, Ziling Chang, Fangmin Huang, Pengyan Wu, Huacong Chu, Jian Wang
A cadmium(ii)-based MOF, Cd-MDIP, was successfully prepared by hydrothermal reaction between the tetra-carboxylic ligand 5,5'-methylenebisophthalic acid (H4MDIP) and cadmium perchlorate. The X-ray crystal structure analysis showed that there are two uncoordinated carboxyl groups in each ligand and a 1D elliptical channel along the [001] direction. Because of the existence of uncoordinated carboxyl groups within open frameworks, Cd-MDIP exhibited a high sensitivity (Stern-Volmer constant KSV = 4.13 × 104 L mol-1) and a low detection limit (80 nM) for Fe3+ ions in pure water, which is much lower than the national standard for Fe3+ in daily drinking water (5...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29790501/catalysis-of-photooxidation-reactions-through-transformation-between-cu-2-and-cu-in-tio-2-cu-mof-composites
#6
Chunjun Chen, Tianbin Wu, Dexin Yang, Pei Zhang, Huizhen Liu, Youdi Yang, Guanying Yang, Buxing Han
Novel porous TiO2@Cu3(BTC)2 composites, which were synthesized using ionic liquids (ILs) as solvents, exhibited excellent activity for photooxidation of styrene to 4-aryl tetralones and promoting the Glaser coupling reaction with O2 under light irradiation. It was discovered that the transformation between Cu2+ and Cu+ was crucial for enhancing the photocatalytic performance.
May 23, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29790496/luminescence-properties-of-mechanochemically-synthesized-lanthanide-containing-mil-78-mofs
#7
Tarek Alammar, Ihor Z Hlova, Shalabh Gupta, Viktor Balema, Vitalij K Pecharsky, Anja-Verena Mudring
Three metal-organic framework (MOF) compounds, Ln0.5Gd0.5{C6H3(COO)3}; Ln = Eu, Tb, and Dy with a MIL-78 structure, have been synthesized by a solvent-free mechanochemical method from stoichiometric mixtures of benzene 1,3,5-tricarboxylic acid, C6H3(COOH)3, also known as trimesic acid, and the respective lanthanide carbonates, Ln2(CO3)3·xH2O, Ln = Eu, Gd, Tb and Dy. MIL-78 (Ln0.5Gd0.5) shows the characteristic red, green, and yellow luminescence of Eu3+, Tb3+, and Dy3+, respectively. Efficient intramolecular energy transfer from the ligand triplet state to the excited states of Ln3+ ions can be observed...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29790219/metal-organic-frameworks-based-on-multicentre-bonded-mi-8-m-mn-zn-clusters-with-cubic-aromaticity
#8
Bin Zhao, Huan-Cheng Hu
A new concept for constructing metal-organic frameworks (MOFs) based on multicentre-bonded [MI]8 (M = Mn, Zn) clusters with cubic aromaticity is discussed. In principle, intermolecular/intramolecular hydrogen-bonding, π***π stacking, coordinated covalent bonding and ionic bonding usually account for the structures of MOFs, and multicentered bonds generally exist in cation, anion, neutral and zwitterionic radicals, while rarely appear in MOFs. Meanwhile, aromaticity became one of the most vexing yet fascinating key concepts in chemistry since the proposition of the structure of benzene molecule in 1865...
May 23, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29790210/a-highly-stable-two-dimensional-copper-ii-organic-framework-for-proton-conduction-and-ammonia-impedance-sensing
#9
Zhibing Sun, Shihang Yu, Lili Zhao, Jifeng Wang, Zifeng Li, Gang Li
This work reports on the design and fabrication of a proton conductive 2D MOF, [Cu(p-IPhHIDC)]n (1) (p-IPhH3IDC = 2-(p-N-imidazol-1-yl)-phenyl-1H-imidazole-4,5dicarboxylic acid) as an advanced ammonia impedance sensor at room temperature and 68-98% RHs. MOF 1 shows the optimized proton conductivity value of 1.51 × 10-3 S·cm-1 at 100 C and 98% RH. Its temperature-dependent and humidity-dependent proton conduction properties have been explored. The large amount of uncoordinated carboxylate groups between the layers play a vital role in the resultant conductivity...
May 22, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29790061/acute-bleeding-obstruction-pancreatitis-after-roux-en-y-anastomosis-in-total-gastrectomy-a-single-center-experience
#10
J Weindelmayer, S Laiti, R La Mendola, M Bencivenga, L Scorsone, V Mengardo, S Giacopuzzi
Anastomotic intraluminal bleeding is a well-known complication after total gastrectomy. Nevertheless, few data are published on acute bleeding obstruction pancreatitis (BOP) due to a bleeding from the jejunojejunostomy (JJ). In this paper we describe our experience. A total of 140 gastrectomies for EGJ cancer were performed in our Institute from January 2012 to January 2017. All reconstructions were performed with a Roux-en-Y anastomosis: a mechanical end-to-side esophago-jejunostomy and a mechanical end-to-side JJ...
May 22, 2018: Updates in Surgery
https://www.readbyqxmd.com/read/29789816/an-anionic-sod-type-terbium-mof-with-extra-large-cavities-for-effective-anthocyanin-extraction-and-methyl-viologen-detection
#11
Wei Du, Zhifeng Zhu, Yue-Ling Bai, Zhen Yang, Shourong Zhu, Jiaqiang Xu, Zhaoxiong Xie, Jianhui Fang
An anionic sod-type zeolitic metal-organic framework [(CH3)2NH2]9{Tb6(η6-TATAT)4(H2O)12}·3Cl·DMA·7H2O [1, H6TATAT = 5,5',5''-(1,3,5-triazine-2,4,6-triyltriimino)tri-1,3-benzenedicarboxylic acid] has been synthesized by metal-ligand directed assembly of hexacarboxylic acid units and Tb3+ ions. Compound 1 with extra-large cavities can efficiently extract natural product anthocyanins from blackberries and release them rapidly into NaCl aqueous solution. And, the nature of the anionic framework makes it very sensitive to detect cationic methyl viologen (MV2+) with a detection limit as low as 1 × 10-8 M...
May 23, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29784336/a-sensitive-colorimetric-immunosensor-based-on-cu-mofs-and-hrp-for-detection-of-dibutyl-phthalate-in-environmental-and-food-samples
#12
Nuanfei Zhu, Yanmin Zou, Menglu Huang, Shuaibing Dong, Xiangyang Wu, Guoxi Liang, Zhixiang Han, Zhen Zhang
A sensitive and artful colorimetric immunosensor based on horseradish peroxidase (HRP) was designed by labelling metal-organic frameworks (Cu-MOFs) on the second antibody (Cu-MOFs@Ab2 ) as signal amplification for the detection of trace dibutyl phthalate (DBP). In this system, when Cu-MOFs@Ab2 was captured by antigen- primary antibody (Ab1 ) complex, tremendous Cu(II) will be released from Cu-MOFs in the presence of nitric acid (HNO3 ), and Cu(II) will be further reduced to Cu(I) after the addition of sodium ascorbate (SA), consequently, inhibiting the HRP to catalyse the colorless 3,3',5,5'-tetramethylbenzidine (TMB) into blue oxidized TMB (ox TMB)...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29783773/energy-storage-analysis-of-a-mixed-r161-mof-5-nanoparticle-nanofluid-based-on-molecular-simulations
#13
Qiang Wang, Shengli Tang, Leilei Li
The thermal properties of refrigerants can be modified by adding porous nanoparticles into them. Here, molecular simulations, including molecular dynamics and grand canonical Monte Carlo, were employed to study the thermal energy storage properties of an R161/MOF-5 nanofluid. The results show that the thermodynamic energy change of MOF-5 nanoparticles is linear to the temperature. The adsorption heat calculated by grand canonical Monte Carlo is close to that calculated by the Clausius⁻Clapeyron equation. Additionally, a negative enhancement of the thermal energy storage capacity of the R161/MOF-5 nanofluid is found near the phase transition area...
May 20, 2018: Materials
https://www.readbyqxmd.com/read/29782694/metal-organic-framework-hybrid-assisted-formation-of-co-3-o-4-co-fe-oxide-double-shelled-nanoboxes-for-enhanced-oxygen-evolution
#14
Xiao Wang, Le Yu, Bu Yuan Guan, Shuyan Song, Xiong Wen David Lou
Rational design of complex metal-organic framework (MOF) hybrid precursors offers a great opportunity to construct various functional nanostructures. Here, a novel MOF-hybrid-assisted strategy to synthesize Co3 O4 /Co-Fe oxide double-shelled nanoboxes is reported. In the first step, zeolitic imidazolate framework-67 (ZIF-67, a Co-based MOF)/Co-Fe Prussian blue analogue (PBA) yolk-shell nanocubes are formed via a facile anion-exchange reaction between ZIF-67 nanocube precursors and [Fe(CN)6 ]3- ions at room temperature...
May 21, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29782692/the-influence-of-chemical-modification-on-linker-rotational-dynamics-in-metal-organic-frameworks
#15
Joshua Damron, Jialiu Ma, Ricardo Kurz, Kay Saalwaechter, Adam Matzger, Ayyalusamy Ramamoorthy
The robust synthetic flexibility of metal-organic frameworks (MOFs) offers a promising class of tailorable materials, for which, the ability to tune specific physicochemical properties is highly desired. This is achievable only through a thorough description of the consequences for chemical manipulations both in structure and dynamics. Magic angle spinning solid-state NMR spectroscopy offers many modalities in this pursuit, particularly for dynamic studies. Herein, we employ a separated-local-field NMR approach to show how specific intra-framework chemical modifications to MOF UiO66 heavily modulate the dynamic evolution of the organic ring moiety over several orders of magnitude...
May 21, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29781002/high-throughput-screening-of-solid-state-catalysts-for-nerve-agent-degradation
#16
Joseph M Palomba, Cy V Credille, Mark Kalaj, Jared B DeCoste, Gregory W Peterson, Trenton M Tovar, Seth M Cohen
A high-throughput screening (HTS) method was devised to increase the rate of discovery and evaluation of nerve agent degradation catalysts. Using this HTS method, >90 solid state materials, predominantly metal-organic frameworks (MOFs), were analyzed for their ability to hydrolyze the nerve agent simulant methyl paraoxon at two pH values (8.0 and 10.0).
May 21, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29780551/protein-surface-functionalisation-as-a-general-strategy-for-facilitating-biomimetic-mineralisation-of-zif-8
#17
Natasha K Maddigan, Andrew Tarzia, David M Huang, Christopher J Sumby, Stephen G Bell, Paolo Falcaro, Christian J Doonan
The durability of enzymes in harsh conditions can be enhanced by encapsulation within metal-organic frameworks (MOFs) via a process called biomimetic mineralisation. Herein we show that the surface charge and chemistry of a protein determines its ability to seed MOF growth. We demonstrate that chemical modification of amino acids on the protein surface is an effective method for systematically controlling biomimetic mineralisation by zeolitic imidazolate framework-8 (ZIF-8). Reaction of surface lysine residues with succinic (or acetic) anhydride facilitates biomimetic mineralisation by increasing the surface negative charge, whereas reaction of surface carboxylate moieties with ethylenediamine affords a more positively charged protein and hinders the process...
May 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/29780543/go-guided-direct-growth-of-highly-oriented-metal-organic-framework-nanosheet-membranes-for-h-2-co-2-separation
#18
Yujia Li, Haiou Liu, Huanting Wang, Jieshan Qiu, Xiongfu Zhang
Highly oriented, ultrathin metal-organic framework (MOF) membranes are attractive for practical separation applications, but the scalable preparation of such membranes especially on standard tubular supports remains a huge challenge. Here we report a novel bottom-up strategy for directly growing a highly oriented Zn2 (bIm)4 (bIm = benzimidazole) ZIF nanosheet tubular membrane, based on graphene oxide (GO) guided self-conversion of ZnO nanoparticles (NPs). Through our approach, a thin layer of ZnO NPs confined between a substrate and a GO ultrathin layer self-converts into a highly oriented Zn2 (bIm)4 nanosheet membrane...
May 7, 2018: Chemical Science
https://www.readbyqxmd.com/read/29780481/linking-defects-hierarchical-porosity-generation-and-desalination-performance-in-metal-organic-frameworks
#19
Weibin Liang, Lin Li, Jingwei Hou, Nicholas D Shepherd, Thomas D Bennett, Deanna M D'Alessandro, Vicki Chen
Composite membranes with defective metal-organic frameworks (MOFs) connect the emerging fields of MOF topological modification, MOF-polymer interfacial engineering and composite material functionalization. Although defective MOFs can be fabricated via thermal or chemical treatment, the relationship between hierarchical MOF structure and their performance in a polymeric membrane matrix has so far not been investigated. Here we show how a modulator fumarate-based MIL-53(Al) microwave synthesis process results in defective MOFs...
April 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/29780471/direct-observation-of-supramolecular-binding-of-light-hydrocarbons-in-vanadium-iii-and-iv-metal-organic-framework-materials
#20
Zhenzhong Lu, Harry G W Godfrey, Ivan da Silva, Yongqiang Cheng, Mathew Savage, Pascal Manuel, Svemir Rudić, Anibal J Ramirez-Cuesta, Sihai Yang, Martin Schröder
Fine tuning of host-guest supramolecular interactions in porous systems enables direct control over the properties of functional materials. We report here a modification of hydrogen bonding and its effect on guest binding in a pair of redox-active metal-organic frameworks (MOFs). Oxidation of MFM-300(VIII ) {[VIII2(OH)2 (L)], LH4 = biphenyl-3,3',5,5'-tetracarboxylic acid} is accompanied by deprotonation of the bridging hydroxyl groups to afford isostructural MFM-300(VIV ), [VIV2O2 (L)]. The precise role of the hydroxyl groups, O -carboxylate centres and π-π interactions in the supramolecular binding of C2 hydrocarbons in these materials has been determined using neutron diffraction and inelastic neutron scattering, coupled with DFT modelling...
April 7, 2018: Chemical Science
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