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https://www.readbyqxmd.com/read/28926222/degradation-of-paraoxon-and-the-chemical-warfare-agents-vx-tabun-and-soman-by-the-metal-organic-frameworks-uio-66-nh2-mof-808-nu-1000-and-pcn-777
#1
Martijn C de Koning, Marco van Grol, Troy Breijaert
In recent years, Zr-based metal-organic frameworks (MOFs) have been developed that facilitate catalytic degradation of toxic organophosphate agents, such as chemical warfare agents (CWAs). Because of strict regulations, experiments using live agents are not possible for most laboratories and, as a result, simulants are used in the majority of cases. Reports that employ real CWAs are scarce and do not cover the whole spectrum of agents. We here present a comparative study in which UiO-66-NH2, NU-1000, MOF-808, and PCN-777 are evaluated for their effectiveness in the degradation of paraoxon and the chemical warfare agents tabun, VX, and soman, in N-ethylmorpholine buffer (pH 10) as well as in pure water...
September 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28926054/efficient-incorporation-of-diverse-components-into-metal-organic-frameworks-via-metal-phenolic-networks
#2
Yangke Long, Ling Xiao, Qihua Cao, Xiaowen Shi, Yunan Wang
Metal phenolic networks (MPNs) were used for the first time for the construction of core@shell MOF materials. Diverse functional nanocores with different shapes and sizes could be coated with ZIF-8 shells mediated by MPNs. The obtained Fe3O4@TA-Fe(3+)@ZIF-8 powder showed a superhydrophobic nature which could efficiently absorb n-hexane from water.
September 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28926043/new-complete-assignment-of-x-ray-powder-diffraction-patterns-in-graphitic-carbon-nitride-using-discrete-fourier-transform-and-direct-experimental-evidence
#3
Bo-Wen Sun, Hong-Yu Yu, Yong-Jing Yang, Hui-Jun Li, Cheng-Yu Zhai, Dong-Jin Qian, Meng Chen
To date, there have been only a few studies focusing on the assignment of X-ray diffraction (XRD) patterns in graphitic carbon nitrides (g-C3N4) and contradictory determination for a broad peak around 12°-14° has been perplexing. In this study, assignments are carried out both theoretically and experimentally. The cell parameters for g-C3N4 are determined as a = b = 8.1 Å, c = 6.5 Å, α = β = 90°, and γ = 120°. Qualitative and semi-quantitative methods such as fast Fourier transform and residual after 1st and 2nd derivatives are used to confirm and search the hidden peaks...
September 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28925694/polyoxometalates-templated-metal-ag-carbene-frameworks-anodic-material-for-lithium-ion-batteries
#4
Jingquan Sha, Peipei Zhu, Xiya Yang, Xueni Li, Xiao Li, Mingbo Yue, Kunfeng Zhou
A POMs templated 3D Ag-carbene framework with lvt-a topology was hydrothermally synthesized. The POMs templated MCF combining the advantages of POMs, MOFs, and carbene not only shows excellent thermal and chemical stabilities but also possesses a good discharge capacity of 481 mAh·g(-1) after 100 cycles applied as anode material in LIBs.
September 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28925520/rational-design-of-bifunctional-2-fold-interpenetrated-zn-ii-metal-organic-framework-for-selective-adsorption-of-co2-and-efficient-aqueous-phase-sensing-of-2-4-6-trinitrophenol
#5
C M Nagaraja, Sandeep Dhankhar, Nayuesh Sharma, Sandeep Kumar, Dhilip Kumar
A bifunctional, microporous Zn(II) metal-organic framework, [Zn2(NH2BDC)2(dpNDI)]n (MOF1) (where, NH2BDC =2-aminoterephthalic acid, dpNDI =N,N'-di(4-pyridyl)-1,4,5,8-naphthalenediimide) has been synthesized solvothermally. MOF1 shows a 2-fold interpenetrated, 3D pillar-layered framework structure composed of two types of 1D channels with dimensions of ~3.80 x 16.9 Å2 and 7.49 x 17.01 Å2 decorated with pendent -NH2 group. Owing to the presence of basic functionalized pore surface, MOF1 exhibits selective adsorption of CO2 with high value of heat of adsorption (Qst = 46...
September 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28925254/tuning-the-endocytosis-mechanism-of-zr-based-mofs-through-linker-functionalisation
#6
Claudia Orellana-Tavra, Salame Haddad, Ross J Marshall, Isabel Abanades Lazaro, Gerard Boix, Inhar Imaz, Daniel Maspoch, Ross S Forgan, David Fairen-Jimenez
A critical bottleneck for the use of metal-organic frameworks (MOFs) as drug delivery systems has been allowing them to reach their intracellular targets without being degraded in the acidic environment of the lysosomes. Cells take up particles by endocytosis through multiple biochemical pathways, and the fate of these particles depends on these routes of entry. Here, we show the effect of functional group incorporation into a series of Zr-based MOFs on their endocytosis mechanisms, allowing us to design an effi-cient drug delivery system...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28922481/photo-induced-assembly-of-a-luminescent-tetraruthenium-square
#7
Baptiste Laramée-Milette, Francesco Nastasi, Fausto Puntoriero, Sebastiano Campagna, Garry S Hanan
Self-assembly is a powerful synthetic tool that has led to the development of one-, two- and three-dimensional architectures. From MOFs to molecular flasks, self-assembled materials have proven to be of great interest to the scientific community. Here we describe a strategy for the construction and de-construction of a supramolecular structure through unprecedented photo-induced assembly and dis-assembly. The combination of two approaches, a [n×1]-directional bonding strategy and a ligand photo-dissociation strategy, allows the photo-induced assembly of a polypyridyl Ru(II) precursor into a discrete molecular square...
September 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28920997/rapid-and-highly-sensitive-detection-of-extracellular-and-intracellular-h2s-by-an-azide-functionalized-al-iii-based-metal-organic-framework
#8
Soutick Nandi, Helge Reinsch, Sooram Banesh, Norbert Stock, Vishal Trivedi, Shyam Biswas
A new, azide-functionalized Al(iii)-based metal-organic framework (MOF) denoted as CAU-10-N3 (1, CAU = Christian-Albrechts-University) and consisting of the 5-azido-isophthalic acid (H2IPA-N3) ligand was employed as a reaction-based fluorescent turn-on probe for the detection of H2S. The activated compound (1') showed fast, selective and highly sensitive sensing properties for extracellular H2S in HEPES buffer (10 mM, pH = 7.4). The material retained its high selectivity even in the presence of possibly competing biological species...
September 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28920674/boosting-catalytic-performance-of-metal-organic-framework-by-increasing-the-defects-via-a-facile-and-green-approach
#9
Gan Ye, Dan Zhang, Xiangfu Li, Kunyue Leng, Wenjuan Zhang, Jun Ma, Yinyong Sun, Wei Xu, Shengqian Ma
The control of defects in crystalline materials has long been of significance since the defects are correlated with the performances of the materials. Yet such control remains a challenge for metal-organic frameworks (MOFs), which are usually well crystallized under hydro/solvo-thermal conditions. In this contribution, we demonstrate for the first time how to increase the defects of MOF via a facile and green approach as exemplified in the context of solvent-free synthesis of UiO-66(Zr). Such increase of defects leads to drastic enhancement of catalysis performance when compared to UiO-66(Zr) prepared from conventional hydro/solvo-thermal synthesis...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920672/assembling-hollow-cobalt-sulfide-nanocages-array-on-graphene-like-manganese-dioxide-nanosheets-for-superior-electrochemical-capacitors
#10
Hao Chen, Min Qiang Wang, Yanan Yu, Heng Liu, Shi-Yu Lu, Shu-Juan Bao, Maowen Xu
Metal-origanic frameworks (MOF)-derived hollow cobalt sulfides have attracted extensive attention due to their porous shell that provides rich redox reactions for energy storage. However, their ultra-dispersed structure and large size of MOFs precursors result in relatively low conductivity, stability, and low tap density .Therefore, the construction of an array of continuous hollow cages and tailor the inner cavity of MOF-derived materials is very effective for enhancing the electrochemical performance. Herein, we in situ assembled small Co-based zeolitic imidazolate framework (ZIF-67) on the both sides of negatively charged MnO2 nanosheets to fabricate a hierarchical sandwich-type composite with hollow cobalt sulfide nanocages/graphene-like MnO2...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920667/warm-white-light-emitting-diode-based-on-a-dye-loaded-metal-organic-framework-for-fast-white-light-communication
#11
Zhiye Wang, Zi Wang, Bangjiang Lin, Xuefu Hu, YunFeng Wei, Cankun Zhang, Bing An, Cheng Wang, Wenbin Lin
A dye@metal-organic framework (MOF) hybrid was used as a phosphor in a white light emitting diode (WLED) for fast visible-light communication (VLC). The white light was generated from a combination of blue emission of the 9,10-dibenzoate anthracene (DBA) linkers and yellow emission of the encapsulated Rhodamine B molecules. The MOF structure not only prevents dye molecules from aggregation-induced quenching, but also efficiently transfers energy to the dye for dual emission. This light-emitting material shows emission lifetimes of 1...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920665/kinetic-and-thermodynamic-control-of-structure-transformations-in-a-family-of-cobalt-ii-organic-frameworks
#12
Qiang Chen, Rui Feng, Jian Xu, Yan-Yuan Jia, Ting-Ting Wang, Ze Chang, Xian-He Bu
Dynamic metal-organic frameworks (MOFs) that respond to external stimuli have recently attracted great attention. However, the subtle control of dynamical processes as well as the illustration of the underlying mechanism, which is crucial for the targeted construction and modulation propose, is extremely challenging. Herein, we report the achievement of simultaneous kinetic and thermodynamic modulation of the structure transformation processes of a family of cobalt(II)-organic frameworks, through the rational combination of co-ligand replacement, solvent molecule substitution and ligand-based solid solution strategies...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920617/thermal-conductivity-of-a-perovskite-type-metal-organic-framework-crystal
#13
Wilarachchige D C B Gunatilleke, Kaya Wei, Zheng Niu, Lukasz Wojtas, George Nolas, Shengqian Ma
We report for the first time the investigation of thermal conductivity for a perovskite-type MOF crystal. In situ single crystal X-ray diffraction technology was employed to track the phase transition of a newly synthesized perovskite MOF. The perovskite MOF crystal exhibits a low thermal conductivity of 1.3 W (K m)(-1) in comparison to most of the bulk crystal materials at room temperature.
September 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28917904/metal-organic-framework-preparation-using-magnetic-graphene-oxide-%C3%AE-cyclodextrin-for-neonicotinoid-pesticide-adsorption-and-removal
#14
Guangyang Liu, Lingyun Li, Donghui Xu, Xiaodong Huang, Xiaomin Xu, Shuning Zheng, Yanguo Zhang, Huan Lin
A novel magnetic copper-based metal-organic framework (M-MOF) was prepared using a Fe4O3-graphene oxide (GO)-β-cyclodextrin (β-CD) nanocomposite as the magnetic core and support, and used for adsorption and removal of neonicotinoid insecticide pollutants from aqueous solution. M-MOF characterization suggested that (1)Fe4O3-GO-β-CD consisted of a thin single layer with anchored Fe3O4. The M-MOF was coated on the Fe4O3-GO-β-CD surface. The M-MOF had a large Brunauer-Emmett-Teller surface area (250.33m(2)g(-1)) and high super-paramagnetism with saturation magnetization of 10...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28916108/a-eu-iii-doped-metal-organic-framework-conjugated-with-fluorescein-labeled-single-stranded-dna-for-detection-of-cu-ii-and-sulfide
#15
Han Weng, Bing Yan
In this paper, Bio-MOF-1 is prepared as reported and then Eu(3+) is introduced into it via cation exchange method. A FAM-labeled ssDNA is chosen to fabricate with the obtained Eu(3+)@Bio-MOF-1. A luminescent hybrid material is assembled, which can exhibit the fluorescence of Eu(3+) and FAM simultaneously by adjusting the ratio of FAM-ssDNA and Eu(3+)@Bio-MOF-1. The sample is then used for the detecting of metal ions, results shows which has good selectively for Cu(2+) (LOD = 0.14 μM, 0-250 μM). The introduction of Cu(2+) can quench the fluorescence of FAM while the luminescent intensity of Eu(3+) enhancing...
October 2, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28916038/a-tri-metal-centered-metal-organic-framework-for-solid-phase-microextraction-of-environmental-contaminants-with-enhanced-extraction-efficiency
#16
Shuqin Liu, Lijun Xie, Qingkun Hu, Huangsheng Yang, Guanrui Pan, Fang Zhu, Shenghong Yang, Gangfeng Ouyang
This study presents the preparation and the characterizations of six tri-metal centered metal-organic frameworks (tM-MOFs) as solid-phase microextraction (SPME) adsorbents. Possessing different proportions of Al, Ga and In atoms in their frameworks, the tM-MOF-based SPME coatings exhibited different extraction performance towards the organic pollutants. Extraction results showed that the M4 (Al0.593Ga0.167In0.240(O2C2H4)(h2fipbb)) coating exhibited the best enrichment ability among six tM-MOFs. In addition, it showed better extraction efficiency towards the analytes than three single-metal centered MOFs coatings and a commercial polydimethylsiloxane (PDMS) coating...
September 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915482/nickel-nanoparticles-encapsulated-in-porous-carbon-and-carbon-nanotube-hybrids-from-bimetallic-metal-organic-frameworks-for-highly-efficient-adsorption-of-dyes
#17
Lina Jin, Xiaoshuang Zhao, Xinye Qian, Mingdong Dong
Nickel nanoparticles encapsulated in porous carbon/carbon nanotube hybrids (Ni/PC-CNT) were successfully prepared by a facile carbonization process using Ni/Zn-MOF as the precursor. Distinct from previous studies, Ni/Zn-MOF precursors were prepared via a direct precipitation method at room temperature for only 5min. After the carbonization, magnetic Ni nanoparticles were well embedded in the porous carbon and carbon nanotube. The obtained Ni/PC-CNT composites had a high surface area (999m(2) g(-1)), large pore volume (0...
September 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28914980/co3o4-co-ncnt-nanostructure-derived-from-a-dicyanamide-based-metal-organic-framework-as-efficient-bi-functional-electrocatalyst-for-oxygen-reduction-and-evolution-reactions
#18
Nivedita Sikdar, Bharathi Konkena, Justus Masa, Wolfgang Schuhmann, Tapas Kumar Maji
There has been growing interest in the synthesis of efficient reversible oxygen electrodes for both the oxygen reduction reaction (ORR) and the oxygen evolution reactions (OER) for their potential use in a variety of renewable energy technologies such as regenerative fuel cells and metal-air batteries. Here, we report a bi-functional electrocatalyst derived from a novel dicyanamide based nitrogen rich MOF {[Co(bpe)2(N(CN)2)](N(CN)2)(5H2O)}n [Co-MOF-1, bpe = 1,2-bis(4-pyridyl)ethane, N(CN)2- = dicyanamide] under different pyrolysis conditions...
September 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28914898/highly-sensitive-temperature-sensor-based-on-an-ultra-compact-mach-zehnder-interferometer-with-side-opened-channels
#19
Ming Deng, Leiguang Liu, Yong Zhao, Guolu Yin, Tao Zhu
We demonstrated an ultra-compact and highly sensitive temperature sensor by using an in-fiber Mach-Zehnder interferometer (MZI) with side-opened channels. The MZI was constructed by off-center splicing a thin piece of microstructured optical fiber (MOF) between two single-mode fibers. Then, two side-opened channels were drilled through the MOF along the transverse direction by using a femtosecond laser to let the liquid with a high thermo-optic coefficient enter into the air cavity of the MZI. Due to the large effective refractive index (RI) difference between the core mode and the cavity mode excited by the offset splicing point, the scale of the MOF-based MZI can be reduced to several hundred micrometers...
September 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28914295/a-novel-photo-active-cd-1-4-benzene-dicarboxylate-metal-organic-framework-templated-using-ru-ii-2-2-bipyridine-3-2-synthesis-and-photophysics-of-rwlc-5
#20
Randy W Larsen, Jacob M Mayers, Lukasz Wojtas
The development of photoactive porous materials is of significant importance for applications ranging from sustainable energy to pharmaceutical development and catalysis. A particularly attractive class of photo-active materials is the metal-organic framework (MOF)-based platform in which the photo-active elements are components of the framework itself or photo-active guests encapsulated within the MOF cavities. It has now been demonstrated that the photo-active [Ru(2,2'-bipyridine)3](2+) (RuBpy) complex can template the formation of MOFs with varying three dimensional structures...
September 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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