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https://www.readbyqxmd.com/read/28731341/a-2d-coordination-network-that-detects-nitro-explosives-in-water-catalyzes-baylis-hillman-reactions-and-undergoes-unusual-2d%C3%A2-3d-single-crystal-to-single-crystal-transformation
#1
Vivekanand Sharma, Dinesh De, Sanchari Pal, Prithwidip Saha, Parimal K Bharadwaj
The solvothermal reaction of Zn(NO3)2·6H2O and a linear dicarboxylate ligand H2L, in the presence of urotropine in N,N'-dimethylformamide (DMF), gives rise to a new porous two-dimensional (2D) coordination network, {[Zn3(L)3(urotropine)2]·2DMF·3H2O}n (1), with hxl topology. Interestingly, framework 1 exhibits excellent emission properties owing to the presence of naphthalene moiety in the linker H2L, that can be efficiently suppressed by subtle quantity of nitro explosives in aqueous medium. Furthermore, presence of urotropine molecules bound to the metal centers, 1 is found to be an excellent heterogeneous catalyst meant for atom-economical C-C bond-forming Baylis-Hillman reactions...
July 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28731218/explosives-in-the-cage-metal-organic-frameworks-for-high-energy-materials-sensing-and-desensitization
#2
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/28731077/high-performance-adsorption-and-separation-of-anionic-dyes-in-water-using-a-chemically-stable-graphene-like-metal-organic-framework
#3
Jun-Jiao Li, Chong-Chen Wang, Hui-Fen Fu, Jing-Rui Cui, Peng Xu, Jie Guo, Jian-Rong Li
A highly stable graphene-like metal-organic framework (BUC-17) was prepared and used as an adsorbent to carry out the adsorption of anionic dyes from simulated wastewater, which exhibited excellent adsorption performance, particularly towards Congo red (CR) up to 4923.7 mg g(-1) at room temperature. It was used to fix a SPE column to conduct rapid separation of anionic dyes from an organic dye matrix. A related mechanism was also proposed.
July 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28729818/a-cooperative-copper-metal-organic-framework-hydrogel-system-improves-wound-healing-in-diabetes
#4
Jisheng Xiao, Siyu Chen, Ji Yi, Hao Zhang, Guillermo A Ameer
Chronic non-healing wounds remain a major clinical challenge that would benefit from the development of advanced, regenerative dressings that promote wound closure within a clinically relevant time frame. The use of copper ions has shown promise in wound healing applications possibly by promoting angiogenesis. However, reported treatments that use copper ions require multiple applications of copper salts or oxides to the wound bed, exposing the patient to potentially toxic levels of copper ions and resulting in variable outcomes...
January 5, 2017: Advanced Functional Materials
https://www.readbyqxmd.com/read/28726925/prospects-for-207-pb-solid-state-nmr-studies-of-lead-tetrel-bonds
#5
Scott A Southern, Dylan Errulat, Jamie M Frost, Bulat Gabidullin, David L Bryce
The feasibility and value of (207)Pb solid-state NMR experiments on compounds featuring lead tetrel bonds is explored. Although the definition remains to be formalized, lead tetrel bonds may be qualitatively described as existing when there is evidence of a net attractive interaction between an electrophilic region associated with lead in a molecular entity and a nucleophilic region in another, or the same, molecular entity. Unambiguous identification of lead tetrel bonds can be challenging due to the hypervalent tendency of lead...
July 20, 2017: Faraday Discussions
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
#6
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/28725895/co-doped-zn1-xcdxs-nanocrystals-from-metal-organic-framework-precursors-porous-microstructure-and-efficient-photocatalytic-hydrogen-evolution
#7
Xiu Tang, Jia-Hui Zhao, Yu-Han Li, Zi-Ji Zhou, Kui Li, Fu-Tian Liu, Ya-Qian Lan
Nanoporous Co-doped Zn1-xCdxS were facilely fabricated via adopting ZIFs as templates, and Cd(NO3)2 and thiourea as precursors. The highly porous microstructure and uniform Co-doping of the photocatalyst afford a high H2-production rate (45.2 and 422.2 times larger than those of Zn0.5Cd0.5S and CdS), providing an effective way for the development of high performance nanoporous photocatalysts.
July 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28724289/deuterohemin-peptide-enzyme-mimic-embedded-metal-organic-frameworks-through-biomimetic-mineralization-with-efficient-atrp-catalytic-activity
#8
Wei Jiang, Xinghuo Wang, Jiawen Chen, Ying Liu, Haobo Han, Yi Ding, Quanshun Li, Jun Tang
An enzyme mimic harboring iron porphyrin (DhHP-6) embedded in zeolite imidazolate framework-8 (ZIF-8) was constructed through biomimetic mineralization approach to obtain the composite DhHP-6@ZIF-8. The composite was then used as catalyst in the ATRP of poly(ethylene glycol) methyl ether methacrylate (PEGMA500) in which poly(PEGMA500) could be synthesized with monomer conversion of 76.1% and Mn of 45,900 g/mol, stronger than free DhHP-6 as catalyst. More importantly, it could efficiently overcome the drawbacks of free DhHP-6 and achieve the easy separation of DhHP-6 from the catalytic system and the elimination of iron residues in the synthesized polymer...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28723109/fast-surface-acoustic-wave-based-sensors-to-investigate-the-kinetics-of-gas-uptake-in-ultra-microporous-frameworks
#9
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/28722297/assessing-guest-molecule-diffusion-in-heterogeneous-powder-samples-of-metal-organic-frameworks-through-pfg-nmr
#10
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/28722072/highly-efficient-cr2o7-2-removal-of-a-3d-metal-organic-framework-fabricated-by-tandem-single-crystal-to-single-crystal-transformations-from-a-1d-coordination-array
#11
Cheng-Peng Li, Hang Zhou, Si Wang, Jing Chen, Zhong-Liang Wang, Miao Du
The single-crystal to single-crystal (SC-SC) transformation from a 1D coordination chain to a 3D coordination network, which is triggered by both solvent and anion exchanges, has been revealed to suffer from a tandem mechanism as proved by isolation of the intermediate state. The resulting porous crystalline material shows a high efficiency for the capture of dichromates (207 mg g(-1)) via the SC-SC anion-exchange.
July 19, 2017: Chemical Communications: Chem Comm
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
#12
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
#13
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/28719053/microwave-assisted-synthesis-of-metal-organic-framework-mil-101-nanocrystals-as-sorbent-and-pseudostationary-phase-in-capillary-electrophoresis-for-the-separation-of-anthraquinones-in-environmental-water-samples
#14
Yue Liu, Jia Hu, Yan Li, Yun-Tao Shang, Jia-Qi Wang, Ye Zhang, Zhong-Liang Wang
In this work, a CE method was developed to separate five anthraquinones: aloe-emodin, rhein, emodin, chrysophanol and physcion. The CE method used a nano-sized metal organic framework MIL-101 (nMIL-101) as pseudostationary phase (PSP) and sorbent for dispersed particle extraction (DPE). The nMIL-101 was synthesized by microwave technique and was characterized by UV-vis, TEM, Zeta potential, X-ray diffraction spectrometry and micropore physisorption. In this method, anthraquinones were adsorbed by nMIL-101 of a fast kinetics within 10 min and then separated by CE...
July 18, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28718645/fourfold-interpenetrated-mof-ni-pybz-2-as-coating-material-in-gas-chromatographic-capillary-column-for-separation
#15
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
#16
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
#17
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
https://www.readbyqxmd.com/read/28718471/two-dimensional-metal-organic-frameworks-with-high-thermoelectric-efficiency-through-metal-ion-selection
#18
Yuping He, Catalin D Spataru, Francois Léonard, Reese E Jones, Michael E Foster, Mark D Allendorf, A Alec Talin
Two-dimensional (2D) materials have attracted much attention due to their novel properties. An exciting new class of 2D materials based on metal-organic frameworks (MOFs) has recently emerged, displaying high electrical conductivity, a rarity among organic nanoporous materials. The emergence of these materials raises intriguing questions about their fundamental electronic, optical, and thermal properties, but few studies exist in this regard. Here we present an atomistic study of the thermoelectric properties of crystalline 2D MOFs X3(HITP)2 with X = Ni, Pd or Pt, and HITP = 2,3,6,7,10,11-hexaiminotriphenylene, using both ab initio transport models and classical molecular dynamics simulations...
July 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28718291/porous-structured-ni-fe-p-nanocubes-derived-from-prussian-blue-analogue-as-electrocatalyst-for-efficient-overall-water-splitting
#19
Cuijuan Xuan, Jie Wang, Weiwei Xia, Zongkai Peng, Zexing Wu, Wen Lei, Kedong Xia, Huolin L Xin, Deli Wang
Exploring non-precious metal electrocatalysts to replace the noble metal based catalysts for full water electrocatalysis is still an ongoing challenge. In this work, porous structured ternary nickel-iron-phosphides (Ni-Fe-P) nanocubes were synthesized through one-step phosphidation of Ni-Fe based Prussian blue analogue. The Ni-Fe-P nanocubes exhibit rough and loose porous structure on the surface under suitable phosphating temperature, which is favorable for the mass transfer and oxygen diffusion during electrocatalysis process...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28715741/a-remarkable-adsorbent-for-removal-of-contaminants-of-emerging-concern-from-water-porous-carbon-derived-from-metal-azolate-framework-6
#20
Biswa Nath Bhadra, Sung Hwa Jhung
A series of metal-azolate frameworks or MAFs-MAF-4, -5, and -6-were synthesized and pyrolyzed to prepare porous carbons derived from MAFs (CDM-4, -5, -6, respectively). Not only the obtained carbons but also MAFs were characterized and applied for the adsorption of organic contaminants of emerging concern (CECs, including pharmaceuticals and personal care products) such as salicylic acid, clofibric acid, diclofenac sodium, bisphenol-A, and oxybenzone (OXB) from water. CDM-6 was found to be the most remarkable adsorbent among the tested ones (including activated carbon) for all the adsorbates...
July 8, 2017: Journal of Hazardous Materials
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