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https://www.readbyqxmd.com/read/27933656/change-in-trabecular-bone-score-tbs-with-antiresorptive-therapy-does-not-predict-fracture-in-women-the-manitoba-bmd-cohort
#1
William D Leslie, Sumit R Majumdar, Uzanne N Morin, Didier Hans, Lisa M Lix
Bone mineral density (BMD) and trabecular bone score (TBS), along with additional clinical risk factors, can be used to identify individuals at high fracture risk. Whether change in TBS in untreated or treated women independently affects fracture risk is unclear. Using the Manitoba (Canada) DXA Registry containing all BMD results for the population we identified 9044 women age >40 years with two consecutive DXA scans and who were not receiving osteoporosis treatment at baseline (baseline mean age 62 ± 10 years)...
December 8, 2016: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/27930852/a-modulator-induced-defect-formation-strategy-to-hierarchically-porous-metal-organic-frameworks-with-high-stability
#2
Guorui Cai, Hai-Long Jiang
The pore size enlargement and structural stability have been recognized as two crucial targets, which are rarely achieved together, in the development of metal-organic frameworks (MOFs). Herein, we have developed a versatile modulator-induced defect-formation strategy, in the presence of monocarboxylic acid as a modulator and an insufficient amount of organic ligand, successfully realizing the controllable synthesis of hierarchically porous MOFs (HP-MOFs) with high stability and tailorable pore characters. Remarkably, the integration of high stability and large mesoporous property enables these HP-MOFs to be important porous platforms for applications involving large molecules, especially in catalysis...
December 8, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27924325/lirb2lab2o6-a-new-rare-earth-borate-with-a-mof-5-like-topological-structure-and-a-short-uv-cut-off-edge
#3
Dongdong Xu, Fangfang Zhang, Yanzhou Sun, Zhihua Yang, Binghua Lei, Lili Liu, Shilie Pan
A new rare-earth borate LiRb2LaB2O6 (LB-1) has been synthesized using a high-temperature solution method. Interestingly, it shares its topological structure with the famous porous material MOF-5, which is formed from Zn4O(BDC)3 (BDC = 1,4-benzenedicarboxylate). The nodes [OZn4] and organic linkers [BDC] of MOF-5 are carefully substituted with La(3+) rare-earth cations and the inorganic linkers [BO3] and [LiO4], respectively, in order to construct a pure inorganic open framework. LB-1 exhibits good thermal and water stability...
December 7, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27922207/stimuli-responsive-dna-functionalized-metal-organic-frameworks-mofs
#4
Jason S Kahn, Lina Freage, Natalie Enkin, Miguel Angel Aleman Garcia, Itamar Willner
The synthesis of nucleic acid-functionalized metal-organic frameworks (MOFs) is described. The metal-organic frameworks are loaded with a dye being locked in the structures by means of stimuli-responsive nucleic acid caps. The pH and K(+) -ion-triggered release, and switchable release, are demonstrated.
December 6, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27922204/encapsulation-of-bimetallic-metal-nanoparticles-into-robust-zr-based-metal-organic-frameworks-evaluation-of-the-catalytic-potential-for-size-selective-hydrogenation
#5
Christoph Rösler, Stefano Dissegna, Victor Lopez Rechac, Max Kauer, Penghu Guo, Stuart Turner, Kevin Ollegott, Hirokazu Kobayashi, Tomokazu Yamamoto, Daniel Peeters, Yuemin Wang, Syo Matsumura, Gustaaf Van Tendeloo, Hiroshi Kitagawa, Martin Muhler, Francesc X Llabrés I Xamena, Roland A Fischer
The realization of metal NPs with bimetallic character and distinct composition for specific catalytic applications is an intensively studied field. Due to the synergy between metals, most of the bimetallic particles exhibit unique properties, only hardly provided by the individual monometallic counterparts. However, as small sized NPs possess high surface energy, agglomeration during catalytic reactions is favored. Sufficient stabilization can be achieved by confinement of NPs in porous support materials. In this sense, especially MOFs gained a lot of attention during the last years, however, encapsulation of bimetallic species remains challenging...
December 6, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27918565/centimetre-scale-micropore-alignment-in-oriented-polycrystalline-metal-organic-framework-films-via-heteroepitaxial-growth
#6
Paolo Falcaro, Kenji Okada, Takaaki Hara, Ken Ikigaki, Yasuaki Tokudome, Aaron W Thornton, Anita J Hill, Timothy Williams, Christian Doonan, Masahide Takahashi
The fabrication of oriented, crystalline films of metal-organic frameworks (MOFs) is a critical step toward their application to advanced technologies such as optics, microelectronics, microfluidics and sensing. However, the direct synthesis of MOF films with controlled crystalline orientation remains a significant challenge. Here we report a one-step approach, carried out under mild conditions, that exploits heteroepitaxial growth for the rapid fabrication of oriented polycrystalline MOF films on the centimetre scale...
December 5, 2016: Nature Materials
https://www.readbyqxmd.com/read/27918303/a-one-dimensional-zinc-ii-coordination-polymer-with-a-three-dimensional-supramolecular-architecture-incorporating-1-1h-benzimidazol-2-yl-methyl-1h-tetrazole-and-adipate
#7
Chun Li Liu, Qiu Ying Huang, Xiang Ru Meng
The synthesis of coordination polymers or metal-organic frameworks (MOFs) has attracted considerable interest owing to the interesting structures and potential applications of these compounds. It is still a challenge to predict the exact structures and compositions of the final products. A new one-dimensional coordination polymer, catena-poly[[[bis{1-[(1H-benzimidazol-2-yl)methyl]-1H-tetrazole-κN(3)}zinc(II)]-μ-hexane-1,6-dicarboxylato-κ(4)O(1),O(1'):O(6),O(6')] monohydrate], {[Zn(C6H8O4)(C9H8N6)2]·H2O}n, has been synthesized by the reaction of Zn(Ac)2 (Ac is acetate) with 1-[(1H-benzimidazol-2-yl)methyl]-1H-tetrazole (bimt) and adipic acid (H2adi) at room temperature...
December 1, 2016: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/27918142/anodized-aluminum-oxide-templated-synthesis-of-metal-organic-frameworks-used-as-membrane-reactors
#8
Yifu Yu, Xue-Jun Wu, Meiting Zhao, Qinglang Ma, Junze Chen, Bo Chen, Melinda Sindoro, Jian Yang, Shikui Han, Qipeng Lu, Hua Zhang
The incorporation of metal-organic frameworks (MOFs) into membrane-shaped architectures is of great importance for practical applications. The currently synthesized MOF-based membranes show many disadvantages, such as poor compatibility, low dispersity, and instability, which severely limit their utility. Herein, we present a general, facile, and robust approach for the synthesis of MOF-based composite membranes through the in situ growth of MOF plates in the channels of anodized aluminum oxide (AAO) membranes...
December 5, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27918056/proton-conducting-crystalline-porous-materials
#9
REVIEW
Xing Meng, Hai-Ning Wang, Shu-Yan Song, Hong-Jie Zhang
Crystalline porous materials are currently a hot research topic in the field of proton-conducting materials. Crystalline porous materials include metal-organic frameworks (MOFs), coordination polymers (CPs), polyoxometalates (POMs) and covalent organic frameworks (COFs). The designable structures and high surface areas of these materials provide great opportunities to orderly accommodate proton carriers and to systemically modify the concentration and mobility of proton carriers in available spaces. Based on the understanding of the relationship between the structure and proton conductivity, controllable synthesis of porous materials with high proton conductivity will gradually be achieved...
December 5, 2016: Chemical Society Reviews
https://www.readbyqxmd.com/read/27918044/luminescent-rare-earth-based-mofs-as-optical-sensors
#10
Partha Mahata, Sudip Kumar Mondal, Debal Kanti Singha, Prakash Majee
Rare-earth-based metal-organic frameworks (ReMOFs) have emerged as an interesting family of compounds, for which new properties are increasingly being found. Based on the potential of ReMOFs, resulting from their optical properties, large numbers of investigations have been carried out during the last decade. Among these investigations, ReMOFs as optical sensors, using their luminescence properties, are increasingly becoming an attractive and useful topic of research. In this study, we have provided the basics of the luminescence behaviour of ReMOFs, various possible sensing mechanisms, and a summary of the uses of ReMOFs for the sensing of nitro explosives, cations, anions, small molecules, pH, and temperature...
December 5, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27918019/three-dimensional-mof-sponge-for-fast-dynamic-adsorption
#11
Huizeng Li, Mingzhu Li, Wenbo Li, Qiang Yang, Yanan Li, Zhenkun Gu, Yanlin Song
Nowadays, environmental pollution is a big problem. Metal organic frameworks (MOFs) provide a novel strategy for exhaust gases adsorption and toxic pollutants removal. We proposed a facile and versatile method to prepare a highly efficient three dimensional MOF-sponge by coating MOF crystals on polyurethane sponge surface, mimicking the porous structure of the marine animal, sponge. Owing to combination of the spatial structure of the commercial sponge and the excellent adsorption capacity of MOF coatings, the MOF-sponge possessed good permeability and high dynamic adsorption capacity...
December 5, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27914342/cu3-btc-2-catalyzed-dehydrogenative-coupling-of-dimethylphenylsilane-with-phenol-and-homocoupling-of-dimethylphenylsilane-to-disiloxane
#12
Nagaraj Anbu, Amarajothi Dhakshinamoorthy
Cu3(BTC)2 (BTC: 1,3,5-benzenetricarboxylic acid) showed to be an efficient and reusable heterogeneous solid catalyst for the formation of SiO bond through dehydrogenative coupling of dimethylphenylsilane (1) with phenol under mild reaction conditions. It is observed that Fe(BTC), MIL-101(Cr) and UiO-66(Zr) are not able to promote this cross coupling between 1 and phenol. Cu3(BTC)2 exhibits higher stability and activity compared to other MOFs studied here. Furthermore, Cu3(BTC)2 is reused for three consecutive cycles with a slight decay in its activity...
November 24, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27900803/large-area-freestanding-mof-films-of-planar-curvilinear-or-micropatterned-topographies
#13
Seok Min Yoon, Jun Heuk Park, Bartosz A Grzybowski
Freestanding MOF films up to six-inches across and replicating various surface (micro)patterns are prepared via a templated growth method. When grown on copper supports, these films have preferred orientation of the constituent crystallites, translating into markedly different wetting properties of the film's two surfaces (water-pinning vs. water repellant). In addition, the films exhibit differential sorption of various organic solvents, can recover oil spills from seawater, and can also act as active layers of chemical sensors...
November 30, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27900384/3d-oxalato-bridged-lanthanide-iii-mofs-with-magnetocaloric-magnetic-and-photoluminescence-properties
#14
Muhammad Nadeem Akhtar, Yan-Cong Chen, Murad A AlDamen, Ming-Liang Tong
Four isostructural 3D lanthanide(iii) metal-organic frameworks with the general formula (H6edte)0.5[Ln(III)(ox)2(H2O)] (Ln = Gd (1), Tb (2), Dy (3) and Ho (4); H4edte = N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine) and ox = oxalate have been synthesized from oxalate. These compounds were characterized using single-crystal X-ray diffraction, FTIR and TGA/DTG. The magnetic investigation has been performed for 1-4 and the results reveal that a Gd(iii) containing MOF has the highest magnetic density and exhibits a larger cryogenic magnetocaloric effect (ΔSm = 35...
November 30, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27897354/magnetic-tuning-of-an-anionic-coii-mof-through-deionization-of-the-framework-spin-canting-spin-flop-and-easy-plane-magnetic-anisotropy
#15
Shaowu Du, Chongbin Tian, Yunhu Han, Zhangzhen He
An anionic CoII-MOF, (Me2NH2)[Co3(Me2NH)3(OH)(SDBA)3] (1) (H2SBDA = 4,4'-sulfonyldibenzoic acid) consisting of highly symmetric CoII3(u3-OH) triangles exhibits spin canting, spin flop and easy plane magnetic anisotropy. Measurement on single crystal shows that the ab plane of 1 is the easy magnetization plane. After the structural modification through simultaneous removal of the coordinated DMA molecule at the Co center and the ionic groups DMA+ and OH-, the resulting neutral amorphous framework 2 displays enhanced spin frustration effect...
November 29, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27897328/solid-phase-extraction-with-metal-organic-frameworks-for-the-analysis-of-chiral-compounds
#16
Bo Tang, Jun-Hui Zhang, Min Zi, Xue-Xian Chen, Li-Ming Yuan
Metal-organic frameworks (MOFs) are excellent porous materials with nanoscale cavities and high surface areas, which make them promising as novel adsorbents in solid-phase extraction (SPE). In this article we report a new application of the chiral MOF [Zn2 (D-Cam)2 (4,4'-bpy)]n in SPE used for the measurement of the enantiomeric excess (ee) of (±)-1,1'-bi-2-naphthol. Several important experimental parameters that may influence the extraction efficiency were investigated and optimized. Under the optimum conditions, a good linearity (R(2)  > 0...
December 2016: Chirality
https://www.readbyqxmd.com/read/27896955/adsorption-and-reactive-desorption-on-metal-organic-frameworks-a-direct-strategy-for-lactic-acid-recovery
#17
Timothée Stassin, Helge Reinsch, Ben Van de Voorde, Stefan Wuttke, Dana D Medina, Norbert Stock, Thomas Bein, Rob Ameloot, Dirk De Vos
Biomass-derived lactic acid (LA) is an important platform chemical towards the sustainable production of numerous materials. However, the fermentation process currently in use is limited by the difficult recovery of the LA product from the fermentation broth and results in the generation of stoichiometric amounts of gypsum waste. Herein, we show that metal-organic frameworks (MOFs) of the UiO-66(Zr) type are effective adsorbents for the separation of LA from aqueous (buffer) solutions. These frameworks based on zirconium clusters and terephthalic acid derivatives display a tremendous uptake (up to 42 wt %) and a high affinity for LA...
November 29, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27896590/improvement-in-thermal-stability-of-sucralose-by-%C3%AE-cyclodextrin-metal-organic-frameworks
#18
Nana Lv, Tao Guo, Botao Liu, Caifen Wang, Vikaramjeet Singh, Xiaonan Xu, Xue Li, Dawei Chen, Ruxandra Gref, Jiwen Zhang
PURPOSE: To explain thermal stability enhancement of an organic compound, sucralose, with cyclodextrin based metal organic frameworks. METHODS: Micron and nanometer sized basic CD-MOFs were successfully synthesized by a modified vapor diffusion method and further neutralized with glacial acetic acid. Sucralose was loaded into CD-MOFs by incubating CD-MOFs with sucralose ethanol solutions. Thermal stabilities of sucralose-loaded basic CD-MOFs and neutralized CD-MOFs were investigated using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and high performance liquid chromatography with evaporative light-scattering detection (HPLC-ELSD)...
November 28, 2016: Pharmaceutical Research
https://www.readbyqxmd.com/read/27896468/evaluation-of-major-trauma-in-elderly-patients-a%C3%A2-single-trauma-center-analysis
#19
Samo Kocuvan, Drago Brilej, Domen Stropnik, Rolf Lefering, Radko Komadina
BACKGROUND: The objective of the study was to gather information about elderly major trauma patients admitted to one particular Slovenian trauma centre in Celje and examine this group of polytrauma patients, specifically with respect to mechanisms of injury, injury severity and distribution of injuries. Further on, to identify morbidity and mortality rates and compare these to the younger population and, finally, to determine the factors that have the most impact on treatment results...
November 28, 2016: Wiener Klinische Wochenschrift
https://www.readbyqxmd.com/read/27896354/structural-and-dynamic-studies-of-substrate-binding-in-porous-metal-organic-frameworks
#20
REVIEW
Timothy L Easun, Florian Moreau, Yong Yan, Sihai Yang, Martin Schröder
Porous metal-organic frameworks (MOFs) are the subject of considerable research interest because of their high porosity and capability of specific binding to small molecules, thus underpinning a wide range of materials functions such as gas adsorption, separation, drug delivery, catalysis, and sensing. MOFs, constructed by the designed assembly of metal ions and functional organic linkers, are an emerging class of porous materials with extended porous structures containing periodic binding sites. MOFs thus provide a new platform for the study of the chemistry and reactivity of small molecules in confined pores using advanced diffraction and spectroscopic techniques...
November 29, 2016: Chemical Society Reviews
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