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Metal Organic Framework

Hailong Lu, Lili Zhang, Jinxia Ma, Nur Alam, Xiaofan Zhou, Yonghao Ni
Metal⁻organic framework (MOF)-based derivatives are attracting increased interest in various research fields. In this study, nano-cellulose MOF-derived carbon-doped CuO/Fe₃O₄ nanocomposites were successfully synthesized via direct calcination of magnetic Cu-BTC MOF (HKUST-1)/Fe₃O₄/cellulose microfibril (CMF) composites in air. The morphology, structure, and porous properties of carbon-doped CuO/Fe₃O₄ nanocomposites were characterized using SEM, TEM, powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometry (VSM)...
February 16, 2019: Nanomaterials
Wan-Chu Yun, Ming-Tong Yang, Kun-Yi Andrew Lin
While zirconium (Zr)-based metal organic frameworks (MOFs) are promising for conversion of levulinic acid (LA) to γ-valerolactone (GVL) through catalytic transform hydrogenation (CTH), these reported Zr MOFs for LA conversion must be synthesized in toxic dimethylformamide (DMF). From the viewpoint of sustainability, it is preferable to avoid usage of DMF-based solvents to prepare these Zr MOFs. As water is a green solvent, the aim of this study is to develop and investigate Zr MOFs, which are prepared in water, for LA conversion to GVL...
February 11, 2019: Journal of Colloid and Interface Science
Guangxu Lan, Kaiyuan Ni, Samuel S Veroneau, Xuanyu Feng, Geoffrey T Nash, Taokun Luo, Ziwan Xu, Wenbin Lin
Nanoscale metal-organic frameworks (nMOFs) have shown great potential as nanophotosensitizers for photodynamic therapy (PDT) owing to their high photosensitizer loadings, facile diffusion of reactive oxygen species (ROSs) through their porous structures, and intrinsic biodegradability. The exploration of nMOFs in PDT, however, remains limited to an oxygen-dependent type II mechanism. Here we report the design of a new nMOF, Ti-TBP, composed of Ti-oxo chain second building units (SBUs) and photosensitizing 5,10,15,20-tetra(p-benzoato)porphyrin (TBP) ligands, for hypoxia-tolerant type I PDT...
February 19, 2019: Journal of the American Chemical Society
Athanasios Koutsianos, Ewa Kazimierska, Andrew R Barron, Marco Taddei, Enrico Andreoli
Zirconium-based metal-organic frameworks (Zr-MOFs) are a subclass of MOFs known for their remarkable stability, especially in the presence of water. This makes them extremely attractive for practical applications, including CO2 capture from industrial emission sources; however, the CO2 adsorption capacity of Zr-MOFs is moderate compared to that of the best performing MOFs reported to date. Functionalization of Zr-MOFs with amino groups has been demonstrated to increase their affinity for CO2. In this work, we assessed the potential of post-synthetic defect exchange (PSDE) as an alternative approach to introduce amino functionalities at missing-cluster defective sites in formic acid modulated UiO-66...
February 19, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Lauren K Macreadie, Emily J Mensforth, Ravichandar Babarao, Kristina Konstas, Shane G Telfer, Cara M Doherty, John Tsanaktsidis, Stuart R Batten, Matthew R Hill
One prominent aspect of metal organic frameworks (MOFs) is the ability to tune the size, shape and chemical characteristics of their pores. MOF-5, with its open cubic connectivity of Zn4O clusters joined by two dimensional, terephthalate linkers, is the archetypal example: both functionalized and elongated linkers produce isoreticular frameworks that define pores with new shapes and chemical environments. The recent discovery of scalable methods to produce cubane-1,4-dicarboxylic acid (1,4-H2cdc) allows the first such opportunity to explore new applications for the most prospective reticular architectures...
February 18, 2019: Journal of the American Chemical Society
Vijay Gupta, Sanjay K Mandal
Using achiral components, a V-shaped dicarboxylic acid (H2 L) and a conformationally flexible bidentate linker (bpp), a thermally stable chiral metal organic framework {[Cd(bpp)(L)(H2 O)]·DMF} n (1), where H2 L = 4,4'-(dimethylsilanediyl)bis-benzoic acid, bpp = 1,3-bis(4-pyridyl)propane and DMF = N,N-dimethylformamide, has been solvothermally synthesized and crystallographically characterized. It consists of 1D helical chains linked at the cadmium centers resulting in an overall 2D framework. Its microporous nature was confirmed by gas-sorption measurements...
February 18, 2019: Inorganic Chemistry
Binbin Tu, Lisa Diestel, Zhao-Lin Shi, W R L Nisansala Bandara, Yi Chen, Weimin Lin, Yue-Biao Zhang, Shane G Telfer, Qiaowei Li
Positioning a diverse set of building blocks in a well-defined array allows for cooperativity amongst them and the systematic programming of functional properties. Extending this concept to porous metal-organic frameworks (MOFs) is challenging since installing multiple components in a well-ordered framework requires careful design of the lattice topology, judicious selection of building blocks, and precise control of the crystallization parameters. In this work, we report how we have met these challenges to prepare the first quinary MOF structure, FDM-8, by bottom-up self-assembly...
February 18, 2019: Angewandte Chemie
Wanjun Mu, Shenzhen Du, Xingliang Li, Qianhong Yu, Rui Hu, Hongyuan Wei, Yuchuan Yang, Shuming Peng
Efficient and irreversible capture of radioactive nuclides is an important environmental protection task when disposing of nuclear wastewater. This paper uses an "ion trapping" concept to design an efficient adsorbent based on a metal-organic framework (MOF), for removal of radioactive strontium from nuclear wastewater. Two functionalized MOFs were achieved by the introduction of sulfate or oxalate into the pore structure of MOF-808, giving MOF-808-SO4 and MOF-808-C2O4, respectively. These functionalized MOF-808 materials exhibit excellent ability to remove Sr2+ from acidic solution due to their particular trapping action, with the maximum Sr2+ adsorption capacities of 176...
February 18, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Yue Zhang, Haiyun Dong, Yuan Liu, Chunhuan Zhang, Fengqin Hu, Yong Sheng Zhao
We demonstrate efficient and stable dual-wavelength microlasers fabricated by encapsulating different organic dyes into metal-organic framework (MOF) microcrystals. The intermolecular interactions between the organic dyes are suppressed effectively by the spatial confinement effect of the MOF pores, enabling a simultaneously efficient optical gain, and therefore lasing at different wavelengths. The results represent an important step towards a function-oriented laser material design.
February 18, 2019: Chemical Communications: Chem Comm
Ilinka Mirkovic, Lei Lei, Darko Ljubic, Shiping Zhu
Herein, metal-organic framework (MOF)-5 crystals were grown on cellulose-based substrates including paper and cotton. Dopamine was used as a surface modification agent to improve the compatibility between MOF-5 crystals and the used substrates. The formed polydopamine film promoted the growth of MOF-5 crystals, which were bonded to the substrates. Besides dopamine, the structure of the substrate also played a major role in the crystal growth. In the case of paper, which had a structure with fibers closely packed to each other, MOF-5 crystals grew only on the surface of fibers (one side) and could easily fall off...
January 31, 2019: ACS Omega
Xiaoxiong Cai, Qionghao Xu, Gaomei Tu, Yanghe Fu, Fumin Zhang, Weidong Zhu
The synthesis of heterogeneous cooperative catalysts in which two or more catalytically active components are spatially separated within a single material has generated considerable research efforts. The multiple functionalities of catalysts can significantly improve the efficiency of existing organic chemical transformations. Herein, we introduce ruthenium (Ru) nanoparticles (NPs) on the surfaces of a metal-organic framework pre-encapsulated with polyoxometalate silicotungstic acid (SiW) UiO-66 (University of Oslo [UiO]) and prepared a 2...
2019: Frontiers in Chemistry
Jiafei Lyu, Xuan Zhang, Ken-Ichi Otake, Xingjie Wang, Peng Li, Zhanyong Li, Zhijie Chen, Yuanyuan Zhang, Megan C Wasson, Ying Yang, Peng Bai, Xianghai Guo, Timur Islamoglu, Omar K Farha
Tetratopic organic linkers have been extensively used in Zr-based metal-organic frameworks (MOFs) where diverse topologies have been observed. Achieving meticulous control over the topologies to tune the pore sizes and shapes of the resulting materials, however, remains a great challenge. Herein, by introducing substituents to the backbone of tetratopic linkers to affect the linker conformation, phase-pure Zr-MOFs with different topologies and porosity were successfully obtained under the same synthetic conditions...
January 28, 2019: Chemical Science
Jack D Humby, Oguarabau Benson, Gemma L Smith, Stephen P Argent, Ivan da Silva, Yongqiang Cheng, Svemir Rudić, Pascal Manuel, Mark D Frogley, Gianfelice Cinque, Lucy K Saunders, Iñigo J Vitórica-Yrezábal, George F S Whitehead, Timothy L Easun, William Lewis, Alexander J Blake, Anibal J Ramirez-Cuesta, Sihai Yang, Martin Schröder
In order to develop new porous materials for applications in gas separations such as natural gas upgrading, landfill gas processing and acetylene purification it is vital to gain understanding of host-substrate interactions at a molecular level. Herein we report a series of six isoreticular metal-organic frameworks (MOFs) for selective gas adsorption. These materials do not incorporate open metal sites and thus provide an excellent platform to investigate the effect of the incorporation of ligand functionality via amide and alkyne groups on substrate binding...
January 28, 2019: Chemical Science
Tim M Becker, Li-Chiang Lin, David Dubbeldam, Thijs J H Vlugt
On the short term, carbon capture is a viable solution to reduce human-induced CO2 emissions, which requires an energy efficient separation of CO2 . Metal-organic frameworks (MOFs) may offer opportunities for carbon capture and other industrially relevant separations. Especially, MOFs with embedded open metal sites have been shown to be promising. Molecular simulation is a useful tool to predict the performance of MOFs even before the synthesis of the material. This reduces the experimental effort, and the selection process of the most suitable MOF for a particular application can be accelerated...
October 25, 2018: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
Xinyi Tan, Chang Yu, Changtai Zhao, Huawei Huang, Xiuchao Yao, Xiaotong Han, Wei Guo, Song Cui, Hongling Huang, Jieshan Qiu
Electrochemical reduction of carbon dioxide to hydrocarbons, driven by renewable power sources, is a fascinating and clean way to remedy greenhouse gas emission as a result of over-dependence on fossil fuels and produce value-added fine chemicals. The Cu-based catalysts feature unique superiorities, nevertheless, achieving high hydrocarbons selectivity is still inhibited and remains great challenges. In this study, we report on a tailor-made multifunction-coupled Cu-metal-organic frameworks (Cu-MOF) electrocatalyst by time-resolved controllable restruction from Cu2O to Cu2O@Cu-MOF...
February 18, 2019: ACS Applied Materials & Interfaces
Kuo Yuan, Tianqun Song, Xiaoting Zhu, Baili Li, Bin Han, Lei Zheng, Jinfeng Li, Xiaotao Zhang, Wenping Hu
On account of unique characteristics, the integration of metal-organic frameworks as active materials in electronic devices attracts more and more attention. The film thickness, uniformity, area, and roughness are all fatal factors limiting the development of electrical and optoelectronic applications. However, research focused on ultrathin free-standing films is in its infancy. Herein, a new method, vapor-induced method, is designed to construct centimeter-sized Ni3 (HITP)2 films with well-controlled thickness (7, 40, and 92 nm) and conductivity (0...
February 18, 2019: Small
Wei Zhou, Dan-Dan Huang, Ya-Pan Wu, Jun Zhao, Tao Wu, Jian Zhang, Dong-Sheng Li, Chenghua Sun, Pingyun Feng, Xianhui Bu
The integration of heterometallic units and nanostructures into metal-organic frameworks (MOFs) used for the oxygen evolution reaction (OER) can enhance the electrocatalytic performance and help elucidate underlying mechanisms. We have synthesized a series of stable MOFs (CTGU-10a1-d1) based on trinuclear metal carboxylate clusters and a hexadentate carboxylate ligand with a (6,6)-connected nia net. We also present a strategy to synthesize hierarchical bimetallic MOF nanostructures (CTGU-10a2-d2). Among these, CTGU-10c2 is the best material for the OER, with an overpotential of 240 mV at a current density of 10 mA cm-2 and a Tafel slope of 58 mV dec-1 ...
February 18, 2019: Angewandte Chemie
Huan Min, Jing Wang, Yingqiu Qi, Yinlong Zhang, Xuexiang Han, Ying Xu, Junchao Xu, Yao Li, Long Chen, Keman Cheng, Guangna Liu, Na Yang, Yiye Li, Guangjun Nie
Photodynamic therapy (PDT) is a promising anticancer treatment and is clinically approved for different types of tumors. However, current PDT suffers several obstacles, including its neutralization by excess glutathione (GSH) in the tumor tissue and its strongly proangiogenic tumor response. In this work, a biomimic, multifunctional nanoparticle-based PDT agent, combining a tumor-targeted photosensitizer with GSH scavenging and antiangiogenesis therapy, is developed. A porphyrinic Zr-metal-organic framework nanoparticle is used simultaneously as the photosensitizer and the delivery vehicle of vascular endothelial growth factor receptor 2 (VEGFR2) inhibitor apatinib...
February 18, 2019: Advanced Materials
Elise M Miner, Sarah S Park, Mircea Dinca
A Cu-azolate metal-organic framework uptakes stoichiometric loadings of Group 1 and 2 metal halides, demonstrating effi-cient reversible release and reincorporation of immobilized anions within the framework. Ion pairing interactions lead to anion-dependent Li+ and Mg2+ transport in Cu4(ttpm)2·0.6CuCl2, whose high surface area affords a high density of uniformly distributed mobile metal cations and halide binding sites. The ability to systematically tune the ionic conductivity yields a solid electrolyte with a Mg2+ ion conductivity rivaling the best materials reported to date...
February 18, 2019: Journal of the American Chemical Society
Jia Li, Lianyan Jiang, Sheng Chen, Angelo Kirchon, Bao Li, Yan-Shuo Li, Hong-Cai Zhou
One of the emerging problems plaguing the chemical industry today is the efficient and cost-effective separation of C2 hydrocarbons. In order to help address this problem, we report a new material, NbU-1, constructed by the extremely cheap starting materials. The special structural characteristics of NbU-1 such as the planar, mixed-valence copper clusters and Lewis-basic adsorption channels enforce interactions with acetylene molecules that lead to the highest kinetic separation efficiency for C2H2/C2H4. Via DFT-D calculations, it is indicated that C2H2 molecules are adsorbed onto the two adjacent Cu(I) centers, but not the usual single open metal sites of Cu centers...
February 18, 2019: Journal of the American Chemical Society
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