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https://www.readbyqxmd.com/read/28644463/hypersensitive-dual-function-luminescence-switching-of-a-silver-chalcogenolate-cluster-based-metal-organic-framework
#1
Ren-Wu Huang, Yong-Sheng Wei, Xi-Yan Dong, Xiao-Hui Wu, Chen-Xia Du, Shuang-Quan Zang, Thomas C W Mak
Silver(i) chalcogenide/chalcogenolate clusters are promising photofunctional materials for sensing, optoelectronics and solar energy harvesting applications. However, their instability and poor room-temperature luminescent quantum yields have hampered more extensive study. Here, we graft such clusters to adaptable bridging ligands, enabling their interconnection and the formation of rigid metal-organic frameworks. By controlling the spatial separation and orientation of the clusters, they then exhibit enhanced stability (over one year) and quantum yield (12...
July 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28641005/electron-crystallography-reveals-atomic-structures-of-metal-organic-nanoplates-with-m12-%C3%AE-3-o-8-%C3%AE-3-oh-8-%C3%AE-2-oh-6-m-zr-hf-secondary-building-units
#2
Ruihan Dai, Fei Peng, Pengfei Ji, Kuangda Lu, Cheng Wang, Junliang Sun, Wenbin Lin
Nanoscale metal-organic frameworks (nMOFs) have shown tremendous potential in cancer therapy and biomedical imaging. However, their small dimensions present a significant challenge in structure determination by single-crystal X-ray crystallography. We report here the structural determination of nMOFs by rotation electron diffraction (RED). Two isostructural Zr- and Hf-based nMOFs with linear biphenyldicarboxylate (BPDC) or bipyridinedicarboxylate (BPYDC) linkers are stable under intense electron beams to allow the collection of high-quality RED data, which reveal a MOF structure with M12(μ3-O)8(μ3-OH)8(μ2-OH)6 (M = Zr, Hf) secondary building units (SBUs)...
June 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28640560/integration-of-biomolecules-with-metal-organic-frameworks
#3
REVIEW
Jia Zhuang, Allison P Young, Chia-Kuang Tsung
Owing to the progressive development of metal-organic-frameworks (MOFs) synthetic processes and considerable potential applications in last decade, integrating biomolecules into MOFs has recently gain considerable attention. Biomolecules, including lipids, oligopeptides, nucleic acids, and proteins have been readily incorporated into MOF systems via versatile formulation methods. The formed biomolecule-MOF hybrid structures have shown promising prospects in various fields, such as antitumor treatment, gene delivery, biomolecular sensing, and nanomotor device...
June 22, 2017: Small
https://www.readbyqxmd.com/read/28640528/evaluation-of-a-novel-metal-organic-framework-as-an-adsorbent-for-the-extraction-of-multiclass-pesticides-from-coconut-palm-cocos-nucifera-l-an-analytical-approach-using-matrix-solid-phase-dispersion-and-liquid-chromatography
#4
Jemmyson Romário de Jesus, Kaline Amaral Wanderley, Severino Alves Júnior, Sandro Navickiene
We report the synthesis, characterization, and application of [Zn(1,4-benzenedicarboxylate)(H2 O)2 ]n , Zn(1,4-benzenedicarboxylate)0.99 (NH2 -1,4-benzenedicarboxylate)0.01 (H2 O)2 ]n , [Zn(1,4-benzenedicarboxylate)0.95 (NH2 -1,4-benzenedicarboxylate)0.05 (H2 O)2 ]n and [Zn(1,4-benzenedicarboxylate)0.9 (NH2 -1,4-benzenedicarboxylate)0.1 (H2 O)2 ]n as sorbents for the extraction of multiclass pesticides from coconut palm. Liquid chromatography with ultraviolet diode array detection was used as the analysis technique, and the experiments were performed at one fortification level (0...
June 22, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28639729/two-dimensional-metal-organic-framework-nanosheets-for-membrane-based-gas-separation
#5
Weishen Yang, Yuan Peng, Yanshuo Li, Yujie Ban
Metal-organic framework (MOF) nanosheets could serve as ideal building blocks of molecular sieve membranes due to their structural diversity and minimized-mass transfer barrier. Till now, discovery of appropriate MOF nanosheets and facile fabrication of high performance MOF nanosheet-based membranes remain as great challenges. Herein, we present a modified soft-physical exfoliation methodology to disintegrate lamellar amphiprotic MOF into nanosheets with high aspect-ratio. Consequently sub-10 nm-thick ultrathin membranes were successfully prepared and demonstrated a remarkable H2/CO2 separation performance with separation factor up to 166 and H2 permeance up to 8 ×10E-7 mol/m2∙s∙Pa at elevated testing temperature due to a well-defined size exclusion effect...
June 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28635263/crystalline-nanochannels-with-pendant-azobenzene-groups-steric-or-polar-effects-on-gas-adsorption-and-diffusion
#6
Hubiao Huang, Hiroshi Sato, Takuzo Aida
An azobenzene-containing, zirconium-based metal-organic framework ((Azo)MOF), upon irradiation with ultraviolet (UV) light at 365 ± 10 nm, underwent trans-to-cis isomerization of its azobenzene pendants to furnish the cis-isomer content of 21% ((Azo)MOF(21%)) in 30 min at the photostationary state and underwent backward isomerization into (Azo)MOF(1%) upon either irradiation with visible light (420-480 nm) or heating. When the cis-isomer content increased, the diffusion rate and amount of CO2 adsorbed into the nanochannels of (Azo)MOF decreased considerably...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28634613/breathing-induced-new-phase-transition-in-an-mil-53-al-nh2-metal-organic-framework-under-high-methane-pressures
#7
Linius Bolinois, Tanay Kundu, Xuerui Wang, Yuxiang Wang, Zhigang Hu, Kenny Koh, Dan Zhao
The high pressure methane sorption tests on a flexible metal-organic framework [MIL-53(Al)-NH2] reveal a new phase transition to a large pore (lp) phase above 45 bar. The mixed-ligand strategy and pressure cycling tests are suggested to reduce the pressure requirement of such a phase transition for applications in natural gas storage.
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28634605/functionalised-cyclodextrin-based-metal-organic-frameworks
#8
K J Hartlieb, A W Peters, T C Wang, P Deria, O K Farha, J T Hupp, J F Stoddart
CD-MOF, an extended framework incorporating the C8 symmetric cyclic oligosaccharide, γ-cyclodextrin (γ-CD), is based on the coordination of alkali metal cations to alternating α-1,4-linked d-glucopyranosyl units on the primary and secondary faces of the γ-CD tori. Here, we report the synthesis and characterisation of an amino-functionalised CD-MOF that is isostructural with pristine CD-MOF and adsorbs CO2 permanently.
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28634602/recent-advances-in-the-computational-chemistry-of-soft-porous-crystals
#9
Guillaume Fraux, François-Xavier Coudert
Here we highlight recent progress in the field of computational chemistry of nanoporous materials, focusing on methods and studies that address the extraordinary dynamic nature of these systems: the high flexibility of their frameworks, the large-scale structural changes upon external physical or chemical stimulation, and the presence of defects and disorder. The wide variety of behavior demonstrated in soft porous crystals, including the topical class of metal-organic frameworks, opens new challenges for computational chemistry methods at all scales...
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28632386/synthesis-of-hierarchically-structured-hybrid-materials-by-controlled-self-assembly-of-metal-organic-framework-with-mesoporous-silica-for-co2-adsorption
#10
Chong Chen, Bingxue Li, Lijin Zhou, Zefeng Xia, Nengjie Feng, Jing Ding, Lei Wang, Hui Wan, Guofeng Guan
The HKUST-1@SBA-15 composites with hierarchical pore structure were constructed by in situ self-assembly of metal-organic framework (MOF) with mesoporous silica. The structure directing role of SBA-15 had an obvious impact on the growth of MOF crystals, which in turn affected the morphologies and structural properties of the composites. The pristine HKUST-1 and the composites with different contents of SBA-15 were characterized by XRD, N2 adsorption-desorption, SEM, TEM, FT-IR, TG, XPS, and CO2-TPD techniques...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28631795/assembly-of-dicobalt-and-cobalt-aluminum-oxide-clusters-on-metal-organic-framework-and-nanocast-silica-supports
#11
Sai Puneet Desai, Camille D Malonzo, Thomas Webber, Jiaxin Duan, Anthony B Thompson, Stephen J Tereniak, Matthew R DeStefano, Cassandra T Buru, Zhanyong Li, R Lee Penn, Omar K Farha, Joseph T Hupp, Andreas Stein, Connie C Lu
NU-1000, a mesoporous metal-organic framework (MOF) featuring hexazirconium oxide nodes and 3 nm wide channels, was infiltrated with a reactive dicobalt complex to install dicobalt active sites onto the MOF nodes. The anchoring of the dicobalt complex onto NU-1000 occurred with a nearly ideal stoichiometry of one bimetallic complex per node and with the cobalt evenly distributed throughout the MOF particle. To access thermally robust multimetallic sites on an all-inorganic support, the modified NU-1000 materials containing either the dicobalt complex, or an analogous cobalt-aluminum species, were nanocast with silica...
June 20, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28628252/microstructural-engineering-and-architectural-design-of-metal-organic-framework-membranes
#12
REVIEW
Yi Liu, Yujie Ban, Weishen Yang
In the past decade, a huge development in rational design, synthesis, and application of molecular sieve membranes, which typically included zeolites, metal-organic frameworks (MOFs), and graphene oxides, has been witnessed. Owing to high flexibility in both pore apertures and functionality, MOFs in the form of membranes have offered unprecedented opportunities for energy-efficient gas separations. Reports on the fabrication of well-intergrown MOF membranes first appeared in 2009. Since then there has been tremendous growth in this area along with an exponential increase of MOF-membrane-related publications...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28628246/heterogeneous-catalysis-in-zeolites-mesoporous-silica-and-metal-organic-frameworks
#13
REVIEW
Jie Liang, Zibin Liang, Ruqiang Zou, Yanli Zhao
Crystalline porous materials are important in the development of catalytic systems with high scientific and industrial impact. Zeolites, ordered mesoporous silica, and metal-organic frameworks (MOFs) are three types of porous materials that can be used as heterogeneous catalysts. This review focuses on a comparison of the catalytic activities of zeolites, mesoporous silica, and MOFs. In the first part of the review, the distinctive properties of these porous materials relevant to catalysis are discussed, and the corresponding catalytic reactions are highlighted...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28628180/enhancing-the-biofuel-upgrade-performance-for-pd-nanoparticles-via-increasing-the-support-hydrophilicity-of-metal-organic-frameworks
#14
Qi Sun, Meng Chen, Briana Aguila, Nicholas Nguyen, Shengqian Ma
In this work, the influence of the hydrophilic/hydrophobic nature of metal-organic framework (MOF) materials on the catalytic performance of supported Pd nanoparticles for biofuel upgrade was studied. We show that the introduction of hydrophilic groups on a MOF can greatly enhance the performance of the resultant catalyst. Specifically, Pd nanoparticles supported on MIL-101-SO3Na with superhydrophilicity (Pd/MIL-101-SO3Na) far outperforms pristine MIL-101 and the benchmark catalyst Pd/C in the hydrodeoxygenation reaction of vanillin, a model component of pyrolysis oil derived from the lignin fraction...
June 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28627874/impact-of-postsynthetic-modification-on-the-electrical-and-magnetic-properties-of-materials
#15
K S Asha, Niyaz Ahmed, Ramesh Nath, Denis Kuznetsov, Sukhendu Mandal
Postsynthetic modification is a promising tool for introducing multifunctional properties in metal-organic frameworks (MOFs). The effects of postsynthetic metal addition/exchange in a barium-based MOF have been well examined toward their magnetic and electrical properties. The rattling motion of the extraframework organic cation is responsible for the ferroelectric behavior. The strong magnetic frustration in Tb@1 is found to arise from the nearly triangular arrangement of Tb(3+) ions in its secondary building unit along the chain direction...
June 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28627873/ni-and-nio-nanoparticles-decorated-metal-organic-framework-nanosheets-facile-synthesis-and-high-performance-nonenzymatic-glucose-detection-in-human-serum
#16
Yun Shu, Yan Yan, Jingyuan Chen, Qin Xu, Huan Pang, Xiaoya Hu
Ni-MOF (metal-organic framework)/Ni/NiO/carbon frame nanocomposite was formed by combing Ni, NiO nanoparticles, C frame with Ni-MOF using an efficient one-step calcination method. The morphology and structure of Ni-MOF/Ni/NiO/C nanocomposite were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and energy disperse spectroscopy (EDS) mapping. Ni-MOF/Ni/NiO/C nanocomposites were immobilized onto glassy carbon electrodes (GCEs) with Nafion film to construct high performance nonenzymatic glucose and H2O2 electrochemical sensors...
June 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28627766/recent-applications-of-metal-organic-frameworks-in-sample-pretreatment
#17
Yonghua Wang, Min Rui, Guanghua Lu
Metal-organic frameworks are promising materials in diverse analytical applications especially in sample pretreatment by virtue of their diverse structure topology, tunable pore size, permanent nanoscale porosity, high surface area and good thermostability. According to hydrostability, metal-organic frameworks are divided into moisture-sensitive and water-stable types. In the actual application, both kinds of metal organic frameworks are usually engineered into hybrid composites containing magnetite, silicon dioxide, graphene or directly carbonized to metal-organic-frameworks-derived carbon...
June 19, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28627553/evans-showell-type-polyoxometalate-constructing-novel-3d-inorganic-architectures-with-alkaline-earth-metal-linkers-syntheses-structures-and-catalytic-properties
#18
Yujiao Hou, Haiyan An, Baojun Ding, Yanqin Li
Four new architectures containing [Co2Mo10H4O38](6-) polyoxoanions, (C2N2H10)2[Sr(H2O)5][Co2Mo10H4O38]·2H2O 1, (C2N2H10)2[Ba(H2O)3][Co2Mo10H4O38]·3H2O 2, (C3N2H12)2[Sr(H2O)5][Co2Mo10H4O38]·3H2O 3 and (C3N2H12)[Ba(H2O)4][Ba(H2O)4][Co2Mo10H4O38]·2H2O 4 (C2N2H10 = ethylenediamine; C3N2H12 = 1,3-propanediamine) have been synthesized and characterized by elemental analysis, IR spectroscopy, solid diffuse reflective spectroscopy, TG analysis, powder X-ray diffraction and single crystal X-ray diffraction. Compounds 1 and 2 obtained in the presence of ethylenediamine, are made of Evans-Showell-type anions [Co2Mo10H4O38](6-), linked by Sr(2+) or Ba(2+) cations to form 3D frameworks...
June 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28627549/self-assembly-of-silver-i-based-high-energy-metal-organic-frameworks-he-mofs-at-ambient-temperature-and-pressure-synthesis-structure-and-superior-explosive-performance
#19
Cheng Shen, Yang Liu, Zhong-Qin Zhu, Yuan-Gang Xu, Ming Lu
Two new high-energy metal-organic frameworks (HE-MOFs), {Ag2(DNMAF)(H2O)2}n (1) and {Ag2(DNMAF)}n (2) were prepared using potassium 4,4'-bis(dinitromethyl)-3,3'-azofurazanate (K2DNMAF) in a self-assembly strategy. Compound 1 exhibits a 3D HE-MOF structure with coordinated water molecules. Compound 2 exhibits compact solvent-free 3D HE-MOFs. Both compounds show good thermostability (decomposition temperature (Td) of 211 and 218 °C) and superior detonation velocities (D) of 9673 m s(-1) and 10 242 m s(-1), detonation pressures (P) of 50...
June 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28627532/phenanthroline-based-metal-organic-frameworks-for-fe-catalyzed-csp-3-h-amination
#20
Nathan C Thacker, Pengfei Ji, Zekai Lin, Ania Urban, Wenbin Lin
We report here the synthesis of a robust and highly porous Fe-phenanthroline-based metal-organic framework (MOF) and its application in catalyzing challenging inter- and intramolecular C-H amination reactions. For the intermolecular amination reactions, a FeBr2-metalated MOF selectively functionalized secondary benzylic and allylic C-H bonds. The intramolecular amination reactions utilizing organic azides as the nitrene source required the reduction of the FeBr2-metalated MOF with NaBHEt3 to generate the active catalyst...
June 19, 2017: Faraday Discussions
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