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https://www.readbyqxmd.com/read/28742330/computational-screening-of-bimetal-functionalized-zr6o8-mof-nodes-for-methane-c-h-bond-activation
#1
Dale R Pahls, Manuel A Ortuño, Peter H Winegar, Christopher J Cramer, Laura Gagliardi
Zr-based metal-organic frameworks (MOFs) are promising supports for copper-based catalysts able to activate methane. Homo- and heterobimetal-functionalized NU-1000 MOF nodes were selected to computationally screen the effect of ancillary metals for C-H bond activation, allowing us to correlate activation free energies with chemical descriptors.
July 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28742326/tellurium-impregnated-porous-cobalt-doped-carbon-polyhedra-as-superior-cathode-for-lithium-tellurium-batteries
#2
Jiarui He, Weiqiang Lv, Yuanfu Chen, Kechun Wen, Chen Xu, Wanli Zhang, Yanrong Li, Wu Qin, Weidong He
Lithium-tellurium (Li-Te) batteries are attractive for energy storage owing to a high theoretical volumetric capacity of 2621 mAh cm-3. In this work, highly nanoporous cobalt and nitrogen co-doped carbon polyhedra (C-Co-N) derived from metal-organic framework (MOF) is synthesized and employed as tellurium host for Li-Te batteries. The Te@C-Co-N cathode with a high Te loading of 77.2 wt% exhibits record-breaking electrochemical performances including an ultrahigh initial capacity of 2615.2 mAh cm-3 approaching the theoretical capacity of Te (2621 mAh cm-3), a superior cycling stability with a high capacity retention of 93...
July 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28740978/synthesis-and-photo-electro-catalytic-properties-of-a-3d-pomof-material-based-on-an-interpenetrated-copper-coordination-polymer-linked-by-in-situ-dual-ligands-and-dawson-type-phosphotungstates
#3
Ling-Yu Fan, Kai Yu, Jing-Hua Lv, He Zhang, Zhan-Hua Su, Lu Wang, Chun-Mei Wang, Bai-Bin Zhou
A novel 3D polyoxometalate metal organic framework (POMOF), [{CuCu (H2O)5(pzc)10(pz)6}{P2W18O62}2]·4H2O (1) (Hpzc = pyrazine-2-carboxylic acid, pz = pyrazine) has been hydrothermally synthesized and characterized by IR, TG, XRD, UV-vis and elemental analyses. In compound 1, the pzc and pz ligands are generated through in situ transformation from pyrazine-2,3-dicarboxylic acid (pzdc) to remove one or two CO2 molecules. The ligands with four coordination modes connect nine crystallographically independent Cu atoms to form a super-big circle unit...
July 25, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28738638/mixed-matrix-membranes-incorporated-with-ln-mof-for-selective-and-sensitive-detection-of-nitrofuran-antibiotics-based-on-inner-filter-effect
#4
Feng Zhang, Hua Yao, Yifan Zhao, Xing Li, Gaowei Zhang, Yangyi Yang
The detection of antibiotics is critical and challenging due to the pervasive use of antibiotics had inevitably brought some negative impacts on ecosystem and human health. Herein, we reported an anti-interfere ability enhanced luminescent sensor of lanthanide metal-organic framework (Ln-MOF) filled mixed matrix membranes (MMMs), which combining the processibility of poly(methyl methacrylate) (PMMA) polymer with Ln-MOF of {[Tb2(AIP)2(H2O)10]·(AIP)·4H2O}n (Tb-AIP, where AIP is 5-aminoisophthalate) fillers...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738619/simultaneous-and-sensitive-electrochemical-detection-of-dihydroxybenzene-isomers-with-uio-66-metal-organic-framework-mesoporous-carbon
#5
Min Deng, Shourui Lin, Xiangjie Bo, Liping Guo
The zirconium-based MOF (UiO-66)/mesoporous carbon (MC) composite was synthesized using conventional hydrothermal method for the first time. The surface morphology and structure of UiO-66/MC composite were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). A novel electrochemical sensor based on UiO-66/MC was constructed for simultaneous and sensitive determination of dihydroxybenzene isomers (DBIs) of hydroquinone (HQ), catechol (CT) and resorcinol (RS)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28737939/several-gd-m-heterometal-organic-frameworks-with-gdn-as-nodes-tunable-structures-and-magnetocaloric-effect
#6
Peng-Fei Shi, Chun-Shuai Cao, Chu-Ming Wang, Bin Zhao
Tunable structures and magnetocaloric effect (MCE) of seven MOFs with [Gdn] as nodes are explored. The [Gdn] node is realized from mononuclear [Gd] to binuclear paddle-wheel [Gd2], tetranuclear tetrahedral [Gd4], and pentanuclear trigonal bipyramidal [Gd5]. Meanwhile, the magnetic entropy changes from 19.4 to 46.0 J·kg(-1)·K(-1). The results reveal that the effect of magnetic density on MCE plays a dominant role for Gd(3+)-based compounds, and high spin ground state of Mn(2+) (S = 5/2) is more favorable to achieve high MCE than that with Zn(2+), Co(2+), and Ni(2+) (Co(2+), S = 3/2; Ni(2+), S = 1)...
July 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28737373/construction-of-a-multi-cage-based-mof-with-a-unique-network-for-e%C3%AF-cient-co2-capture
#7
Mei-Hui Yu, Ping Zhang, Rui Feng, Zhao-Quan Yao, Yi-Chen Yu, Tong-Liang Hu, Xian-He Bu
As a kind of MOFs, cage-based MOFs usually carry large voids and small windows, which are advantageous to the storage of small molecules that remain kinetically trapped inside the cages (confinement effect). By adjusting the size of windows via reticular synthesis, the cage-based MOFs can selectively capture and separate the suitable size molecules. Here, considering angle-directed and face-directed strategies, a novel multi-cage-based MOF NUM-3 with a new (3,4,5)-connected topology was successfully constructed in the mixed-ligands assembly...
July 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28733715/clinical-performance-of-an-updated-trabecular-bone-score-tbs-algorithm-in-men-and-women-the-manitoba-bmd-cohort
#8
G I Schacter, W D Leslie, S R Majumdar, S N Morin, L M Lix, D Hans
This is the first study to directly compare the original and recently updated versions of the trabecular bone score (TBS) algorithm. We confirmed improved performance of the new algorithm, especially among men. INTRODUCTION: Lumbar spine trabecular bone score (TBS) predicts major osteoporotic fractures (MOFs) and hip fractures (HFs) independent of bone density. The original TBS algorithm (version 1; [TBS-v1]) was optimized for women of average body size. Limitations were identified when used in men or extremes of body mass index (BMI)...
July 21, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28733014/removal-of-congo-red-dye-from-aqueous-solution-with-nickel-based-metal-organic-framework-graphene-oxide-composites-prepared-by-ultrasonic-wave-assisted-ball-milling
#9
Shuaiqi Zhao, Ding Chen, Fuhua Wei, Nini Chen, Zhao Liang, Yun Luo
Metal-organic frameworks (MOFs) were successfully synthesized by ultrasonic wave-assisted ball milling. In the absence of organic solvent, the coupling effect of ultrasonic wave and mechanical force played an significant role in the synthesis of MOFs. Adsorption of Congo red (CR) was studied in view of adsorption kinetic, isotherm and thermodynamics. The adsorbent was carried out using X-ray diffraction (XRD), thermogravimetric analysis (TGA), N2 adsorption-desorption isotherms, Raman spectroscopy and scanning electron microscope (SEM) methods...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28731218/explosives-in-the-cage-metal-organic-frameworks-for-high-energy-materials-sensing-and-desensitization
#10
REVIEW
Shan Wang, Qianyou Wang, Xiao Feng, Bo Wang, Li Yang
An overview of the current status of coordination polymers and metal-organic frameworks (MOFs) pertaining to the field of energetic materials is provided. The explosive applications of MOFs are discussed from two aspects: one for detection of explosives, and the other for explosive desensitization. By virtue of their adjustable pore/cage sizes, high surface area, tunable functional sites, and rich host-guest chemistry, MOFs have emerged as promising candidates for both explosive sensing and desensitization...
July 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28726378/ptnps-as-scaffolds-to-regulate-interenzyme-distance-for-construction-of-efficient-enzyme-cascade-amplification-for-ultrasensitive-electrochemical-detection-of-mmp-2
#11
Beibei Kou, Yaqin Chai, Yali Yuan, Ruo Yuan
The high catalytic efficiency of enzyme cascade reaction mainly depends on optimal interenzyme distance regulated by the special scaffolds. In this work, the rigid PtNPs with different sizes were employed as scaffolds to regulate interenzyme distance for efficient enzyme cascade amplification to construct electrochemical biosensor for sensitive detection of matrix metalloproteinases-2 (MMP-2), which overcame the drawbacks of instable construction and sophisticated preparation induced by conventional scaffolds such as metal-organic frameworks (MOFs), DNA nanostructures...
July 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28723109/fast-surface-acoustic-wave-based-sensors-to-investigate-the-kinetics-of-gas-uptake-in-ultra-microporous-frameworks
#12
Benjamin Paschke, Achim Wixforth, Dmytro Denysenko, Dirk Volkmer
Observation of the kinetics and measurement of the activation energies for gas diffusion in porous materials requires very fast and sensitive sensors. In this work, thin films of metal-organic frameworks (MOFs) with different pore sizes are grown on a surface acoustic wave (SAW) substrate, resulting in very sensitive and specific sensor systems for the detection of various gases at very short time scales. Using specially designed SAW delay lines for the detection, up to 200-nm-wide cubic MOF crystals were grown directly from a solution on the sensitive sensor chip area...
June 23, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722405/the-effective-approach-to-promote-proton-conductivity-of-mofs-by-exposure-to-aqua-ammonia-vapor
#13
Xi Liang, Bin Li, Minghao Wang, Jing Wang, Ruilan Liu, Gang Li
We explored proton conductivities of two 3D Co(II) MOFs, {[Co3(m-ClPhIDC)2(H2O)6]·2H2O}n (m-ClPhH3IDC = 2-(m-chlorophenyl)-imidazole-4,5-dicarboxylic acid) (1) and {[Co3(p-ClPhHIDC)3(H2O)3]·6H2O}n (p-ClPhH3IDC = 2-(p-chlorophenyl)-imidazole-4,5-dicarboxylic acid) (2) under water and aqua-ammonia vapors, respectively. The experimental results revealed that the proton conductivities of 1 and 2 at aqua-ammonia vapor were 2.89 × 10-2 S·cm-1 and 4.25 × 10-2 S·cm-1, respectively, and approximately two orders of magnitude greater than those of them at water vapor...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28722297/assessing-guest-molecule-diffusion-in-heterogeneous-powder-samples-of-metal-organic-frameworks-through-pfg-nmr
#14
Roland Thoma, Jörg Kärger, Nader de Sousa Amadeu, Sandra Nießing, Christoph Janiak
Investigation of guest diffusion in porous metal-organic frameworks (MOFs) is of major importance since many porosity-related properties of MOFs are influenced by diffusion effects. The diffusion of dimethylsulfoxide (DMSO) in the metal-organic framework (MOF) MIL-53-NH2(Al) was investigated through pulsed-field-gradient (PFG) NMR spectroscopy. The microporous material was synthesized in small crystallites (under 500 nm), which agglomerated in a large range of particle sizes, giving a morphologically very heterogeneous sample...
July 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28721438/serum-adiponectin-predicts-fracture-risk-in-individuals-with-type-2-diabetes-the-fukuoka-diabetes-registry
#15
Yuji Komorita, Masanori Iwase, Hiroki Fujii, Toshiaki Ohkuma, Hitoshi Ide, Tamaki Jodai-Kitamura, Akiko Sumi, Masahito Yoshinari, Udai Nakamura, Dongchon Kang, Takanari Kitazono
AIMS/HYPOTHESIS: Serum adiponectin has been reported to impact upon fracture risk in the general population. Although type 2 diabetes is associated with increased fracture risk, it is unclear whether serum adiponectin predicts fractures in individuals with type 2 diabetes. The aim of the study was to prospectively investigate the relationship between serum adiponectin and fracture risk in individuals with type 2 diabetes. METHODS: In this study, data was obtained from The Fukuoka Diabetes Registry, a multicentre prospective study designed to investigate the influence of modern treatments on the prognoses of patients with diabetes mellitus...
July 18, 2017: Diabetologia
https://www.readbyqxmd.com/read/28719671/environmentally-benign-dry-gel-conversions-of-zr-based-uio-metal-organic-frameworks-with-high-yield-and-the-possibility-of-solvent-re-use
#16
Serkan Gökpinar, Tatyana Diment, Christoph Janiak
Herein we report an alternative synthesis method for Zr-based UiO metal-organic frameworks (MOFs), namely dry-gel conversion (DGC). It was possible to synthesize nano- to microsized UiO-66, UiO-66-NH2 and UiO-67 with high crystallinity, high surface area and increased yield using only one-sixth or less of the solvent volume compared to the solution synthesis on the same scale. Additionally, it is shown that solvent re-use is possible over at least five synthesis runs making the DGC method an ecological and extremely solvent-economical route to obtain Zr-based UiO-MOFs with reproducible results...
July 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28719190/chiral-mo8o26-4-polyoxoanion-induced-three-dimensional-architectures-with-homochiral-eight-fold-interpenetrated-metal-organic-frameworks
#17
Mengjie Zhou, Dawei Yan, Yayu Dong, Xingxiang He, Yan Xu
A pair of novel chiral compounds based on homochiral 8-fold interpenetrated metal-organic frameworks (MOFs) and chiral polyoxometalates (POMs), formulated as d-[Cu(4,4'-bipy)1.5]4[Mo8O26] (d-1) and l-[Cu(4,4'-bipy)1.5]4[Mo8O26] (l-1) (4,4'-bipy = 4,4'-bipyridine), have been successfully synthesized and characterized by single crystal X-ray diffraction, infrared, thermogravimetric analysis, elemental analysis, and solid circular dichroism spectra. Structural analysis indicates that two compounds are enantiomers...
July 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28718645/fourfold-interpenetrated-mof-ni-pybz-2-as-coating-material-in-gas-chromatographic-capillary-column-for-separation
#18
Yan Zhang, Li Wang, Ru-Xin Yao, Xian-Ming Zhang
A fourfold interpenetrated diamond-like topological metal-organic framework (MOF), Ni(pybz)2 [pybz = 4-(4-pyridyl)benzoate] was successfully synthesized and fully characterized. This MOF can serve as coating material in gas chromatographic capillary column for the separation of some low boiling point essential oils. The prepared columns have good recognition ability and excellent selectivity toward a series of organic compounds, including alcohols, aldehydes, ketones, carboxylic acid, ethers, ester, and amines...
July 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28718644/general-and-direct-method-for-preparing-oligonucleotide-functionalized-metal-organic-framework-nanoparticles
#19
Shunzhi Wang, C Michael McGuirk, Michael B Ross, Shuya Wang, Pengcheng Chen, Hang Xing, Yuan Liu, Chad A Mirkin
Metal-organic frameworks (MOFs) are a class of modular, crystalline, and porous materials that hold promise for storage and transport of chemical cargoes. Though MOFs have been studied in bulk forms, ways of deliberately manipulating the external surface functionality of MOF nanoparticles are less developed. A generalizable approach to modify their surfaces would allow one to impart chemical functionality onto the particle surface that is independent of the bulk MOF structure. Moreover, the use of a chemically programmable ligand, such as DNA, would allow for the manipulation of interparticle interactions...
July 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28718631/a-copper-ii-paddlewheel-metal-organic-framework-with-exceptional-hydrolytic-stability-and-selective-adsorption-and-detection-ability-of-aniline-in-water
#20
Ya Chen, Bin Wang, Xiaoqing Wang, Lin-Hua Xie, Jinping Li, Yabo Xie, Jian-Rong Jeff Li
Copper(II) paddlewheel based metal-organic frameworks (CP-MOFs) represent a unique subclass of MOFs with highly predictable porous structures, facile syntheses, and functional open metal sites. However, lack of high hydrolytic stability is an obstacle for CP-MOFs in many practical applications. In this work, we report a new CP-MOF, [Cu4(tdhb)] (BUT-155), which is constructed from a judiciously designed carboxylate ligand with high coordination connectivity (octatopic), abundant hydrophobic substituents (six methyl groups), and substituent constrained geometry (tetrahedral backbone), tdhb8- (H8tdhb = 3,3',5,5'-tetra(3,5-dicarboxyphenyl)-2,2',4,4',6,6'-hexamethylbiphenyl))...
July 18, 2017: ACS Applied Materials & Interfaces
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