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metal-organic framework

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https://www.readbyqxmd.com/read/28550280/doping-of-metal-organic-frameworks-towards-resistive-sensing
#1
Hidetsugu Shiozawa, Bernhard C Bayer, Herwig Peterlik, Jannik C Meyer, Wolfgang Lang, Thomas Pichler
Coordination polymerization leads to various metal-organic frameworks (MOFs) with unique physical properties and chemical functionalities. One of the challenges towards their applications as porous materials is to make MOFs optimally conductive to be used as electronic components. Here, it is demonstrated that Co-MOF-74, a honeycomb nano-framework with one-dimensionally arranged cobalt atoms, advances its physical properties by accommodating tetracyanochinodimethan (TCNQ), an acceptor molecule. Strong intermolecular charge transfer reduces the optical band gap down to 1...
May 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28549314/application-of-novel-metal-organic-framework-mil-53-fe-and-its-magnetic-hybrid-for-removal-of-pharmaceutical-pollutant-doxycycline-from-aqueous-solutions
#2
Shakiba Naeimi, Hossein Faghihian
As a pharmaceutical pollutant, doxycycline causes contamination when enters into the environment. In this research MIL-53(Fe), and its magnetic hybrid MIL-53(Fe)/Fe3O4 were synthesized and employed for removal of doxycycline from aqueous solutions. The adsorbents were characterized by XRD, SEM, BET, FTIR, EDAX, VSM and TG-DTG technique. The effect of different variables such as DOC concentration, pH, contacting time, and adsorbent dose on the removal efficiency was studied and under optimized conditions the adsorption capacity of 322mgg(-1) was obtained...
May 11, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28549217/surface-enhanced-raman-scattering-active-gold-nanoparticles-with-enzyme-mimicking-activities-for-measuring-glucose-and-lactate-in-living-tissues
#3
Yihui Hu, Hanjun Cheng, Xiaozhi Zhao, Jiangjiexing Wu, Faheem Muhammad, Shichao Lin, Jian He, Liqi Zhou, Chengping Zhang, Yu Deng, Peng Wang, Zhengyang Zhou, Shuming Nie, Hui Wei
Gold nanoparticles (AuNPs) with simultaneous plasmonic and biocatalytic properties provide a promising approach to developing versatile bioassays. However, the combination of AuNPs' intrinsic enzyme mimicking properties with their surface-enhanced Ra-man scattering (SERS) activities has yet to be explored. Here we designed a peroxidase mimicking nanozyme by in situ growing AuNPs into a highly porous and thermally stable metal-organic framework (MOF) called MIL-101. The obtained AuNPs@MIL-101 nanozymes acted as the peroxidase mimics to oxidize Raman inactive reporter leucomalachite green (LMG) into the active malachite green (MG) with hydrogen peroxide, and simultaneously as the SERS substrates to enhance the Raman signals of the as-produced MG...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28548822/iron-containing-metal-organic-frameworks-structure-synthesis-and-applications-in-environmental-remediation
#4
Xiaocheng Liu, Yaoyu Zhou, Jiachao Zhang, Lin Tang, Lin Luo, Guangming Zeng
Metal-organic Frameworks (MOFs) with Fe content are gradually developing into an independent branch in environmental remediation, requiring economical, effective, low toxic strategies to the complete procedure. In this review, the recent advancements in the structure, synthesis and environmental application focusing on the mechanism are presented. The unique structure of novel design proposed specific characteristics of different iron containing MOFs with potential innovation. Synthesis of typical MILs, NH2-MILs and MILs based materials reveal the basis and defect of the current method, indicating the optimal means for the actual requirements...
May 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28548484/controlled-release-of-naringin-in-metal-organic-frameworks-mofs-loaded-mineralized-collagen-coating-to-simultaneously-enhance-osseointegration-and-antibacterial-activity
#5
Mengfei Yu, Dongqi You, Junjun Zhuang, Suya Lin, Lingqing Dong, Shengtao Weng, Bin Zhang, Kui Cheng, Wen-Jian Weng, Huiming Wang
Two important goals in orthopedic implants research are to promote osseointegration and prevent infection. However, much of previous efforts have been paid on the design of coatings either to enhance osseointegration while ignoring antibacterial activity or vice versa, to prevent infection while ignoring bone integration. Here, we designed a multifunctional mineralized collagen coating on titanium with the aid of metal-organic frameworks (MOFs) nanocrystals to control the release of naringin, a Chinese herbal medicine which could promote osseointegration and prevent bacterial infection...
May 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28544389/bimetal-organic-framework-derivation-of-ball-cactus-like-ni-sn-p-c-cnt-as-long-cycle-anode-for-lithium-ion-battery
#6
Ruoling Dai, Weiwei Sun, Li-Ping Lv, Minghong Wu, Hao Liu, Guoxiu Wang, Yong Wang
Metal phosphides are a new class of potential high-capacity anodes for lithium ion batteries, but their short cycle life is the critical problem to hinder its practical application. A unique ball-cactus-like microsphere of carbon coated NiP2 /Ni3 Sn4 with deep-rooted carbon nanotubes (Ni-Sn-P@C-CNT) is demonstrated in this work to solve this problem. Bimetal-organic-frameworks (BMOFs, Ni-Sn-BTC, BTC refers to 1,3,5-benzenetricarboxylic acid) are formed by a two-step uniform microwave-assisted irradiation approach and used as the precursor to grow Ni-Sn@C-CNT, Ni-Sn-P@C-CNT, yolk-shell Ni-Sn@C, and Ni-Sn-P@C...
May 22, 2017: Small
https://www.readbyqxmd.com/read/28543992/surface-modification-of-two-dimensional-metal-organic-layers-creates-biomimetic-catalytic-microenvironments-for-selective-oxidation
#7
Wenjie Shi, Lingyun Cao, Hua Zhang, Xin Zhou, Bing An, Zekai Lin, Ruihan Dai, Jianfeng Li, Cheng Wang, Wenbin Lin
Microenvironments in enzymes play crucial roles in controlling the activities and selectivities of reaction centers. Herein we report the tuning of the catalytic microenvironments of metal-organic layers (MOLs), a two-dimensional version of metal-organic frameworks (MOFs) with thickness down to a monolayer, to control product selectivities. By modifying the secondary building units (SBUs) of MOLs with monocarboxylic acids such as gluconic acid, we successfully changed the hydrophobicity/hydrophilicity around the active sites and fine-tuned the selectivity in photocatalytic oxidation of tetrahydrofuran (THF) to exclusively afford butyrolactone (BTL), likely via prolonging residence time of reaction intermediates in the hydrophilic microenvironment of catalytic centers...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28541696/reversible-redox-activity-in-multicomponent-metal-organic-frameworks-constructed-from-trinuclear-copper-pyrazolate-building-blocks
#8
Binbin Tu, Qingqing Pang, Huoshu Xu, Xiaomin Li, Yulin Wang, Zhen Ma, Linhong Weng, Qiaowei Li
Inorganic functionalization of metal-organic frameworks (MOFs), such as incorporating multiple inorganic building blocks with distinct metals into one structure and further modulating the metal charges, endows the porous materials with significant properties towards their applications in catalysis. In this report, by exploring the role of 4-pyrazolecarboxylic acid (H2PyC) in the formation of trinuclear copper pyrazolate as a metalloligand in situ, four new MOFs with multiple components in order were constructed through one-pot synthesis...
May 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28541694/metal-organic-frameworks-for-heterogeneous-basic-catalysis
#9
Li Zhu, Xiao-Qin Liu, Hai-Long Jiang, Lin-Bing Sun
Great attention has been given to metal-organic frameworks (MOFs)-derived solid bases because of their attractive structure and catalytic performance in various organic reactions. The extraordinary skeleton structure of MOFs provides many possibilities for incorporation of diverse basic functionalities, which is unachievable for conventional solid bases. The past decade has witnessed remarkable advances in this vibrant research area; however, MOFs for heterogeneous basic catalysis have never been reviewed until now...
May 25, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28541686/general-oriented-formation-of-carbon-nanotubes-from-metal-organic-frameworks
#10
Jiashen Meng, Chaojiang Niu, Linhan Xu, Jiantao Li, Xiong Liu, Xuanpeng Wang, Yuzhu Wu, Xiaoming Xu, Wenyi Chen, Qi Li, Zi-Zhong Zhu, Dongyuan Zhao, Liqiang Mai
Carbon nanotubes (CNTs) are of great interest for many potential applications because of their extraordinary electronic, mechanical and structural properties. However, issues of chaotic staking, high cost and high energy dissipation in the synthesis of CNTs remain to be resolved. Here we develop a facile, general and high-yield strategy for the oriented formation of CNTs from metal-organic frameworks (MOFs) through a low-temperature (as low as 430 °C) pyrolysis process. The selected MOF crystals act as a single precursor for both nanocatalysts and carbon sources...
May 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28541301/construction-of-hierarchically-porous-metal-organic-frameworks-through-linker-labilization
#11
Shuai Yuan, Lanfang Zou, Jun-Sheng Qin, Jialuo Li, Lan Huang, Liang Feng, Xuan Wang, Mathieu Bosch, Ali Alsalme, Tahir Cagin, Hong-Cai Zhou
A major goal of metal-organic framework (MOF) research is the expansion of pore size and volume. Although many approaches have been attempted to increase the pore size of MOF materials, it is still a challenge to construct MOFs with precisely customized pore apertures for specific applications. Herein, we present a new method, namely linker labilization, to increase the MOF porosity and pore size, giving rise to hierarchical-pore architectures. Microporous MOFs with robust metal nodes and pro-labile linkers were initially synthesized...
May 25, 2017: Nature Communications
https://www.readbyqxmd.com/read/28541029/homochiral-mof-as-circular-dichroism-sensor-for-enantioselective-recognition-on-nature-and-chirality-of-unmodified-amino-acids
#12
Yan-Wu Zhao, Yan Wang, Xian-Ming Zhang
Self-assembly of zinc salt with rationally designed chiral ligand, (1R,2R)-2-(pyridine-4-yl carbamoyl) cyclohexanecarboxylic acid (RR-PCCH) generated 2D homochiral metal-organic framework [Zn(RR-PCCHC)2] (HMOF-1) that is composed of DNA-like right-handed double-helix structure. HMOF-1 shows high solvent and thermal stability and is also stable in neutral, weak acidic and weak basic aqueous solution. Emulsified HMOF-1 shows strong inherent circular dichroism (CD) signal in aqueous solution, which can show regular intensity change by induction of amino acids...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28540729/dye-bio-mof-1-composite-as-a-dual-emitting-platform-for-enhanced-detection-of-a-wide-range-of-explosive-molecules
#13
Chen Wang, Li Tian, Wei Zhu, Shiqiang Wang, Peng Wang, Yun Liang, Wanlin Zhang, Hongwei Zhao, Guangtao Li
By incorporating a cationic dye within metal-organic framework (MOF) through ion-exchange process, a responsive dye@bio-MOF-1 composite has been synthesized, serving as a dual-emitting platform for enhanced detection of different kinds of nitro-explosives, especially the nitroalkanes, nitramines and nitrate esters. The dye@bio-MOF-1 composite was constructed with free amines on their well-defined cavities, which is essential for the capture of explosives into their confined nanospace. It was observed that the encapsulation of explosives into the constructed dye@bio-MOF-1 composite could dramatically alter the luminescent properties of the dyes as well as the MOF skeletons owing to the size exclusivity and confinement-induced effect...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28540551/zif-8-derived-nitrogen-doped-porous-carbon-as-metal-free-catalyst-of-peroxymonosulfate-activation
#14
Wenjie Ma, Yunchen Du, Na Wang, Peng Miao
Nitrogen-doped porous carbon (NPC) is synthesized through a direct pyrolysis of zeolitic imidazolate framework (ZIF)-8 under N2 flow followed by acid washing process. It is found that NPC-800 pyrolyzed at 800 °C can inherit the perfect rhombic dodecahedron morphology of ZIF-8 crystals and achieve the considerable nitrogen-doping content of 15.20%. When NPC-800 is applied as the heterogeneous catalyst in peroxymonosulfate (PMS) activation for the degradation of Rhodamine B (RhB) and phenol, NPC-800 will exhibit its better performance than some conventional transition metal-based oxides and common carbon materials...
May 24, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28538098/two-dimensional-metal-organic-framework-nanosheets-as-an-enzyme-inhibitor-modulation-of-the-%C3%AE-chymotrypsin-activity
#15
Ming Xu, Shuai Yuan, Xin-Yu Chen, Yu-Jie Chang, Gregory Steven Day, Zhi-Yuan Gu, Hong-Cai Zhou
Two-dimensional metal-organic framework (MOF) nanosheets are utilized as effective enzyme inhibitors, providing an in-spiring means to enhance the control of cellular processes as well as improve our understanding of the surface chemistry between MOFs and enzymes. In this paper, we demonstrated that the activity of α-Chymotrypsin (ChT) can be effectively inhibited with 96.9% inhibition by the 2-D Cu(bpy)2(OTf)2 nanosheets, while the other Zn2(bim)4 nanosheets show no significant inhibition effect towards ChT...
May 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28537723/multivariate-metal-organic-frameworks-as-multifunctional-heterogeneous-asymmetric-catalysts-for-a-broad-of-sequential-reactions
#16
Qingchun Xia, Zijian Li, Chunxia Tan, Yan Liu, Wei Gong, Yong Cui
The search for versatile heterogeneous catalysts with multiple active sites for a broad of asymmetric transformations has long been of great interest, but it remains a formidable synthetic challenge. Here we demonstrate that multivariate metal-organic frameworks (MTV-MOFs) can be used as an excellent platform to engineer heterogeneous catalysts featuring multiple and cooperative active sites. An isostructural series of twofold interpenetrated MTV-MOFs that contain up to three different chiral metallosalen catalysts were constructed and used as efficient and recyclable heterogeneous catalysts for a variety of asymmetric sequential alkene epoxidation/epoxide ring-opening reactions...
May 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28537718/homochiral-metal-organic-frameworks-with-tunable-nanoscale-channel-array-and-their-enantioseparation-performance-against-chiral-diols
#17
Chao Zhuo, Yuehong Wen, Shengmin Hu, Tianlu Sheng, Ruibiao Fu, Zhenzhen Xue, Hao Zhang, Haoran Li, Jigang Yuan, Xi Chen, Xintao Wu
Enantioseparation is an integral process in the pharmaceutical industry, considering the ever-increasing demand for chiral medicine products. As a new material, porous metal-organic frameworks (MOFs) have shown their potential application in this field because their structures are easy to adjust and control. Though chiral recognition between racemic substrates and frameworks has made preliminary progress, discussions of their size-matching effects are rare. Herein with the help of channel-tunable homochiral MOFs (HMOFs), diols of different sizes have been separated in good enantiomeric excess (ee%)...
May 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28537402/an-efficient-blue-emissive-metal-organic-framework-mof-for-lanthanide-encapsulated-multicolor-and-stimuli-responsive-luminescence
#18
Wei Huang, Feifei Pan, Yang Liu, Shuaidan Huang, Yujie Li, Juan Yong, Yao Li, Alexander M Kirillov, Dayu Wu
A novel blue-emitting Zn(II) MOF featuring parallel 2D+2D interpenetrated layers and tubelike channels was generated and shown to efficiently accommodate lanthanide(III) cations (Ln(3+) = Eu(3+), Tb(3+), or a mixture of Eu(3+)/Tb(3+)), resulting in the Ln(3+)-encapsulated functional materials with a tunable emission color, including red, green, and nearly pure white light. Furthermore, the thermal-responsive luminescence was investigated for the lanthanide-codoped MOF to exhibit the chromic transition from white at room temperature to blue around liquid nitrogen temperature...
May 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28537384/cysteine-functionalized-metal-organic-framework-facile-synthesis-and-high-efficient-enrichment-of-n-linked-glycopeptides-in-cell-lysate
#19
Wen Ma, Linnan Xu, Xianjiang Li, Sensen Shen, Mei Wu, Yu Bai, Huwei Liu
Cysteine-functionalized metal-organic framework (MOF) was synthesized via a common and facile two-step method of in situ loading of Au nanoparticles on amino-derived MOF followed by L-Cysteine immobilization. Owing to the large specific surface area and ultrahigh hydrophilicity of this nanocomposite, excellent performance was observed in the enrichment of N-linked glycopeptides in both model glycoprotein and HeLa cell lysate. By using this nanocomposite, 16 and 31 glycopeptides were efficiently extracted from digest of horseradish peroxidase (HRP) and human serum immunoglobulin G (IgG), respectively...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537382/in-situ-monitoring-of-the-mechanosynthesis-of-the-archetypal-metal-organic-framework-hkust-1-effect-of-liquid-additives-on-the-milling-reactivity
#20
Tomislav Stolar, Lisa Batzdorf, Stipe Lukin, Dijana Žilić, Cristina Motillo, Tomislav Friščić, Franziska Emmerling, Ivan Halasz, Krunoslav Užarević
We have applied in situ monitoring of mechanochemical reactions by high-energy synchrotron powder X-ray diffraction to study the role of liquid additives on the mechanochemical synthesis of the archetypal metal-organic framework (MOF) HKUST-1, which was one of the first and is still among the most widely investigated MOF materials to be synthesized by solvent-free procedures. It is shown here how the kinetics and mechanisms of the mechanochemical synthesis of HKUST-1 can be influenced by milling conditions and additives, yielding on occasion two new and previously undetected intermediate phases containing a mononuclear copper core, and that finally rearrange to form the HKUST-1 architecture...
May 24, 2017: Inorganic Chemistry
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