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metal-organic framework

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
Pei-Qin Liao, Xun-Wei Chen, Si-Yang Liu, Xu-Yu Li, Yan-Tong Xu, Minni Tang, Zebao Rui, Hongbing Ji, Jie-Peng Zhang, Xiao-Ming Chen
Tremendous efforts have been devoted to increasing the CO2 capture performance of porous materials, especially for low CO2 concentration environments. Here, we report that hydrazine can be used as a diamine short enough to functionalize the small-pore metal-organic framework [Mg2(dobdc)] (H4dobdc = 2,5-dihydroxyl-1,4-benzenedicarboxylic acid). By virtue of the ultrahigh concentration of free amine groups (6.01 mmol g(-1) or 7.08 mmol cm(-3)) capable of reversible carbamic acid formation, the new material [Mg2(dobdc)(N2H4)1...
October 19, 2016: Chemical Science
Congzhou Wang, Sirimuvva Tadepalli, Jingyi Luan, Keng-Ku Liu, Jeremiah J Morrissey, Evan D Kharasch, Rajesh R Naik, Srikanth Singamaneni
A zeolitic imidazolate framework-8 (ZIF-8) grown around antibodies anchored to plasmonic nanostructures serve as a protective layer to preserve the biorecognition ability of antibodies stored at room and elevated temperatures for several days. The biofunctionality of the ZIF-8 protected biochip can be restored by a simple water rinsing step, making it highly convenient for use in point-of-care and resource-limited settings.
December 7, 2016: Advanced Materials
Quan-Guo Zhai, Xianhui Bu, Chengyu Mao, Xiang Zhao, Luke Daemen, Yongqiang Cheng, Anibal J Ramirez-Cuesta, Pingyun Feng
Metal-organic frameworks are a class of crystalline porous materials with potential applications in catalysis, gas separation and storage, and so on. Of great importance is the development of innovative synthetic strategies to optimize porosity, composition and functionality to target specific applications. Here we show a platform for the development of metal-organic materials and control of their gas sorption properties. This platform can accommodate a large variety of organic ligands and homo- or hetero-metallic clusters, which allows for extraordinary tunability in gas sorption properties...
December 7, 2016: Nature Communications
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
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
Xiao-Li Sun, Wei-Hua Deng, Hui Chen, Hong-Liang Han, Jared M Taylor, Chong-Qing Wan, Gang Xu
To develop proton conducting materials under low humidity condition and moderate working temperature still remains challenging for fuel-cell technology. Herein, we show a new type of proton-conducting material, EIMS-HTFSA@MIL, which was prepared by impregnating binary ionic liquids, EIMS-HTFSA, into mesoporous metal-organic framework, MIL-101. Taking advantages of the ionic liquid, such as high thermal stability, non-volatility, non-flammability and low corrosivity, EIMS-HTFSA@MIL shows potential application on proton conduction above 100 oC as a safe electrolyte...
December 5, 2016: Chemistry: a European Journal
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
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
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
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
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
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
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
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
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
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
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
Jamie A Gould, Harprit Singh Athwal, Alexander J Blake, William Lewis, Peter Hubberstey, Neil R Champness, Martin Schröder
A family of Cu(II)-based metal-organic frameworks (MOFs) has been synthesized using three pyridyl-isophthalate ligands, H2L(1) (4'-(pyridin-4-yl)biphenyl-3,5-dicarboxylic acid), H2L(2) (4''-(pyridin-4-yl)-1,1':4',1''-terphenyl-3,5-dicarboxylic acid) and H2L(3) (5-[4-(pyridin-4-yl)naphthalen-1-yl]benzene-1,3-dicarboxylic acid). Although in each case the pyridyl-isophthalate ligands adopt the same pseudo-octahedral [Cu2(O2CR)4N2] paddlewheel coordination modes, the resulting frameworks are structurally diverse, particularly in the case of the complex of Cu(II) with H2L(3), which leads to three distinct supramolecular isomers, each derived from Kagomé and square nets...
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Thomas J Reade, Thomas S Murphy, James A Calladine, Raphael Horvath, Ian P Clark, Gregory M Greetham, Michael Towrie, William Lewis, Michael W George, Neil R Champness
The structures and photochemical behaviour of two new metal-organic frameworks (MOFs) are reported. Reaction of Re(2,2'-bipy-5,5'-dicarboxylic acid)(CO)3Cl or Mn(2,2'-bipy-5,5'-dicarboxylic acid)(CO)3Br with LiCl or LiBr, respectively, produces single crystals of {Li2(DMF)2 [(2,2'-bipy-5,5'-dicarboxylate)Re(CO)3Cl]}n ( RELI: ) or {Li2(DMF)2[(2,2'-bipy-5,5'-dicarboxylate)Mn(CO)3Br]}n ( MNLI: ). The structures formed by the two MOFs comprise one-dimensional chains of carboxylate-bridged Li(I) cations that are cross-linked by units of Re(2,2'-bipy-5,5'-dicarboxylate)(CO)3Cl ( RELI: ) or Mn(2,2'-bipy-5,5'- dicarboxylate)(CO)3Br ( MNLI: )...
January 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
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