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https://www.readbyqxmd.com/read/28453274/a-porous-array-of-clock-qubits
#1
Joseph M Zadrozny, Audrey T Gallagher, T David Harris, Danna E Freedman
The command of atomic-level spatial control over qubits, the fundamental units of both quantum information processing systems and quantum sensors, constitutes a crucial cross-field challenge. Toward this end, embedding electronic spin based qubits within the framework of a crystalline porous material is a promising approach to create precise arrays of qubits. Realizing porous hosts for qubits would also impact the emerging field of quantum sensing, whereby porosity enables analytes to infuse into a sensor matrix...
April 28, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28449406/a-water-stable-dual-channel-luminescence-sensor-for-uo22-ion-based-on-an-anionic-terbium-iii-metal-organic-framework
#2
Junwei Ye, Raji Feyisa Bogale, Yangwei Shi, Yanzhen Chen, Xigang Liu, Yaoyao Yang, Siqi Zhang, Jianzhang Zhao, Guiling Ning
A stable 3D Tb(III)-based metal-organic framework [Tb(BPDC)2]*(CH3)2NH2 (DUT-101) was synthesized, and it is the first efficient dual-channel luminescence sensor for aqueous UO22+ ion. DUT-101 possesses an anionic three-dimensional framework and protonated dimethylamine molecules embedded within the channels. Intense green emission of DUT-101 could be highly selectively and sensitively quenched by UO22+ ions even in the coexistence of other competing metal ions. The possible sensing mechanism was proposed as well based on both suppression of luminescence resonance energy transfer and enhancement of intermolecular electronic transfer...
April 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28449264/macroscopically-oriented-porous-materials-with-periodic-ordered-structures-from-zeolites-and-metal-organic-frameworks-to-liquid-crystal-templated-mesoporous-materials
#3
REVIEW
Joonil Cho, Yasuhiro Ishida
Porous materials with molecular-sized periodic structures, as exemplified by zeolites, metal-organic frameworks, or mesoporous silica, have attracted increasing attention due to their range of applications in storage, sensing, separation, and transformation of small molecules. Although the components of such porous materials have a tendency to pack in unidirectionally oriented periodic structures, such ideal types of packing cannot continue indefinitely, generally ceasing when they reach a micrometer scale...
April 27, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28448879/adsorption-of-organic-arsenic-acids-from-water-over-functionalized-metal-organic-frameworks
#4
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
#5
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
#6
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/28447593/edge-2-transitive-trinodal-polyhedra-and-2-periodic-tilings
#7
Olaf Delgado-Friedrichs, Michael O'Keeffe
All trinodal, edge-2-transitive polyhedra and 2-periodic tilings are enumerated and described. These are of special interest for the design and synthesis of materials such as metal-organic polyhedra and frameworks.
May 1, 2017: Acta Crystallographica. Section A, Foundations and Advances
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
#8
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
#9
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
#10
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
#11
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/28443863/-fefe-hydrogenase-active-site-model-chemistry-in-a-uio-66-metal-organic-framework
#12
Sonja Pullen, Souvik Roy, Sascha Ott
The reactivity of [Fe2(dcbdt)(CO)6] (1) confined in a UiO-66(Zr) metal-organic framework towards CO ligand substitutions with phosphines of different sizes was investigated. The reaction with smaller phosphines (PX3, X = Me, Et) is more selective compared to analogous reactions in homogenous solution phase, and two CO ligands at up to 80% of all [FeFe] sites in UiO-66-1 are replaced. The produced [Fe2(dcbdt)(CO)4(PX3)2] complexes in the UiO-66 matrix behave like typical [FeFe] hydrogenase active site model complexes, are reduced at more cathodic potentials than their hexacarbonyl analogues, and form bridging hydrides under acidic conditions...
April 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28443854/infrared-laser-writing-of-mofs
#13
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/28443668/tungsten-vi-copper-i-sulfur-cluster-supported-metal-organic-frameworks-bridged-by-in-situ-click-formed-tetrazolate-ligands
#14
Qiu-Fang Chen, Xin Zhao, Quan Liu, Ji-Dong Jia, Xiao-Ting Qiu, Ying-Lin Song, David James Young, Wen-Hua Zhang, Jian-Ping Lang
Six analogous two-dimensional (2D) [Tp*WS3Cu3]-based (Tp* = hydridotris(3,5-dimethylpyrazol-1-yl)borate) networks, namely, {[(Tp*WS3Cu3)2L3](μ3-N3)}n (2: L = 5-methyltetrazolate (Mtta); 3a: L = 5-ethyltetrazolate (Etta)) and {[(Tp*WS3Cu3)2L3]BF4}n (3b: L = Etta; 4: L = 5-propyltetrazolate (Ptta); 5: L = 5-butyltetrazolate (Btta); 6: L = 5-pentyltetrazolate (Petta)) were synthesized by reactions of [Et4N][Tp*WS3] (1), [Cu(CH3CN)4]BF4, NaN3, and NH4BF4 in different nitrile solvents (CH3(CH2)nCN, n = 0, 1, 2, 3, and 4) under solvothermal conditions...
April 26, 2017: Inorganic Chemistry
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
#15
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
#16
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
#17
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/28440386/effect-of-chemical-structure-of-s-nitrosothiols-on-nitric-oxide-release-mediated-by-the-copper-sites-of-a-metal-organic-framework-based-environment
#18
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/28437639/a-novel-biosensor-based-on-boronic-acid-functionalized-metal-organic-frameworks-for-the-determination-of-hydrogen-peroxide-released-from-living-cells
#19
Hongxia Dai, Wenjuan Lü, Xianwei Zuo, Qian Zhu, Congjie Pan, Xiaoying Niu, Juanjuan Liu, HongLi Chen, Xingguo Chen
In this work, we report a durable and sensitive H2O2 biosensor based on boronic acid functionalized metal-organic frameworks (denoted as MIL-100(Cr)-B) as an efficient immobilization matrix of horseradish peroxidase (HRP). MIL-100(Cr)-B features a hierarchical porous structure, extremely high surface area, and sufficient recognition sites, which can significantly increase HRP loading and prevent them from leakage and deactivation. The H2O2 biosensor can be easily achieved without any complex processing. Meanwhile, the immobilized HRP exhibited enhanced stability and remarkable catalytic activity towards H2O2 reduction...
April 18, 2017: Biosensors & Bioelectronics
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
#20
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
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