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Metal Organic Framework

Zheng-Hong Huang, Nan-Hong Xie, Min Zhang, Bo-Qing Xu
Pyrolyzed base-metal based metal-organic frameworks (MOFs) with FeNX coordinations are emerging as non-precious metal catalysts for electrochemical oxygen reduction reaction (ORR). However, it is surprising that non-pyrolyzed MOFs involving Fe-N coordinations have not yet been explored in that perspective. We report herein the catalytic performance of a semiconducting non-pyrolyzed iron triazolate framework (FeTa2) for ORR in alkaline electrolyte. This FeTa2 catalyst is studied as composites with different amounts of conductive Ketjenblack carbon (KB)...
October 19, 2018: ChemSusChem
Minglei Mao, Tao Gao, Singyuk Hou, Chunsheng Wang
Benefiting from a higher volumetric capacity (3833 mA h cm-3 for Mg vs. 2046 mA h cm-3 for Li) and dendrite-free Mg metal anode, reversible Mg batteries (RMBs) are a promising chemistry for applications beyond Li ion batteries. However, RMBs are still severely restricted by the absence of high performance cathodes for any practical application. In this review, we provide a critical and rigorous review of Mg battery cathode materials, mainly reported since 2013, focusing on the impact of structure and composition on magnesiation kinetics...
October 19, 2018: Chemical Society Reviews
Feng-Juan Zhao, Yan-Xi Tan, Wenjing Wang, Zhanfeng Ju, Daqiang Yuan
By adjustment of the arm lengths of two triphenylamine-based ligands, two nearly isostructural metal-organic frameworks (MOFs), namely, the reported nanoporous FIR-29 (FIR = Fujian Institute of Research) and the new microporous FJI-Y9 (FJI = Fujian Institute), are obtained, and all exhibit honeycomb lattices of hexagonal channels with Ca-COO chains connected by tris[(4-carboxyl)phenylduryl]amine (H3 TCPA) ligands and 4,4',4''-nitrilotribenzoic acid (H3 NTB) ligands, respectively. Although the Brunauer-Emmett-Teller (BET) surface area (1117 m2 g-1 ) and pore size (8...
October 19, 2018: Inorganic Chemistry
Muxin Lu, Yajuan Deng, Yi Luo, Junping Lv, Tianbao Li, Juan Xu, Shu-Wei Chen, Jinyi Wang
The development of an effective method for detecting heavy metal ions remains a serious task due to their high toxicity to public health and environments. Herein, a new electrochemical method based on a graphene aerogel (GA) and metal-organic framework (MOF) composites was developed for simultaneous detection of multiple heavy metal ions in aqueous solutions. The GA-MOF composites were synthesized via the in situ growth of the MOF UiO-66-NH2 crystal on the GA matrix. GA not only serves as the backbone for UiO-66-NH2 but also enhances the conductivity of the composites by accelerating the electron transfer in the matrix...
October 19, 2018: Analytical Chemistry
Jiuhai Wang, Yadi Fan, Youhua Tan, Xin Zhao, Yu Zhang, Changming Cheng, Mo Yang
The aberrant aggregation of amyloid-β peptide (Aβ) in the brain has been considered as the major pathological hallmark of Alzheimer's diseases (AD). Inhibition of Aβ aggregation is considered as an attractive therapeutic intervention for alleviating amyloid-associated neurotoxicity. Here, we report the near-infrared light (NIR)-induced suppression of Aβ aggregation and reduction of Aβ-induced cytotoxicity via porphyrinic metal-organic framework (MOF) PCN-224 nanoparticles. PCN-224 nanoparticles are hydrothermally synthesized by coordinating tetra-kis(4-carboxyphenyl)porphyrin (TCPP) ligands with zirconium...
October 19, 2018: ACS Applied Materials & Interfaces
Hong-Guo Hao, Yun-Feng Zhao, Di-Ming Chen, Jia-Mei Yu, Kui Tan, Sheng-Qian Ma, Yves Chabal, Zhi-Ming Zhang, Jian-Min Dou, Zi-Hui Xiao, Gregory Day, Hong-Cai Zhou, Tong-Bu Lu
The removal of C2H2 and C2H6 from C2H4 streams is of great significance for the purification of feedstock to produce polyethylene and other commodity chemicals, while the simultaneous absorption of C2H6 and C2H2 over C2H4 from a ternary mixture has never been realized. Herein, a robust metal-organic framework TJT-100 was design and synthesized, which demonstrates remarkably selective adsorption of C2H2 and C2H6 over C2H4. Breakthrough experiments show that TJT-100 can be used as an absorbent for high-performance purification of C2H4 from a ternary mixture of C2H2/C2H4/C2H6 (0...
October 19, 2018: Angewandte Chemie
Zhaobin Wang, Haolin Yin, Gregory C Fu
Carbon-carbon bonds, including those between sp3 -hybridized carbon atoms (alkyl-alkyl bonds), typically comprise much of the framework of organic molecules. In the case of sp3 -hybridized carbon, the carbon can be stereogenic and the particular stereochemistry can have implications for structure and function1-3 . As a consequence, the development of methods that simultaneously construct alkyl-alkyl bonds and control stereochemistry is important, although challenging. Here we describe a strategy for enantioselective alkyl-alkyl bond formation, in which a racemic alkyl electrophile is coupled with an olefin in the presence of a hydrosilane, through the action of a chiral nickel catalyst...
October 18, 2018: Nature
Jakob Sablowski, Julia Linnemann, Simone Hempel, Volker Hoffmann, Simon Unz, Michael Beckmann, Lars Giebeler
Superhierarchically rough films are rapidly synthesised on metal substrates via electrochemically triggered self-assembly of meso/macroporous-structured metal-organic framework (MOF) crystals. These coatings are applied to immobilise a functional oil with low surface energy to provide stable coatings repellent to a wide range of hydrophobic as well as hydrophilic fluids. Such omniphobic surfaces are highly interesting for several applications such as anti-fouling, anti-icing, and dropwise condensation, and become easily scalable with the presented bottom-up fabrication approach...
October 18, 2018: Scientific Reports
Louis Longley, Sean M Collins, Chao Zhou, Glen J Smales, Sarah E Norman, Nick J Brownbill, Christopher W Ashling, Philip A Chater, Robert Tovey, Carola-Bibiane Schönlieb, Thomas F Headen, Nicholas J Terrill, Yuanzheng Yue, Andrew J Smith, Frédéric Blanc, David A Keen, Paul A Midgley, Thomas D Bennett
The original version of this Article contained an error in Figure 1b, where the blue '(ZIF-4-Zn)0.5 (ZIF-62)0.5 blend' data curve was omitted from the enthalpy response plot. This has now been corrected in both the PDF and HTML versions of the Article.
October 18, 2018: Nature Communications
Ying Chuan Tan, Hua Chun Zeng
Interactions between metal nanoparticles (NPs) and metal-organic frameworks (MOFs) in their composite forms have proven to exhibit beneficial properties, such as enhanced catalytic performance through synergistic effects. Herein, we show that Lewis basic sites can be created within an anionic defective MOF by engineering the electronic state of the pendant carboxylate groups situated at the defect sites. This is achieved from the concerted interactions between the pendant carboxylate groups, embedded Pd NPs and charge-balancing cations (Mn+  = Ce3+ , Co2+ , Ni2+ , Cu2+ , Mg2+ , Li+ , Na+ or K+ )...
October 18, 2018: Nature Communications
Tianyu Zhu, Ye Sha, Jing Yan, Parasmani Pageni, Md Anisur Rahman, Yi Yan, Chuanbing Tang
The fields of soft polymers and macromolecular sciences have enjoyed a unique combination of metals and organic frameworks in the name of metallopolymers or organometallic polymers. When metallopolymers carry charged groups, they form a class of metal-containing polyelectrolytes or metallo-polyelectrolytes. This review identifies the unique properties and functions of metallo-polyelectrolytes compared with conventional organo-polyelectrolytes, in the hope of shedding light on the formation of functional materials with intriguing applications and potential benefits...
October 18, 2018: Nature Communications
Ruben Demuynck, Jelle Wieme, Sven M J Rogge, Karen D Dedecker, Louis Vanduyfhuys, Michel Waroquier, Veronique Van Speybroeck
Various kinds of flexibility have been observed in metal-organic frameworks, which may originate from the topology of the material or the presence of flexible ligands. The construction of free energy profiles describing the full dynamical behavior along the phase transition path is challenging since it is not trivial to identify collective variables able to identify all metastable states along the reaction path. In this work, a systematic three-step protocol to uniquely identify the dominant order parameters for structural transformations in flexible metal-organic frameworks and subsequently construct accurate free energy profiles is presented...
October 18, 2018: Journal of Chemical Theory and Computation
Ning Xu, Qinghua Zhang, Baoshan Hou, Qian Cheng, Guoan Zhang
Iron(III) ions play a vital role in living biological systems, while organic pollutants including pesticides and antibiotics pose a great threat to the ecological environment. Effective detection for these species is crucial for human health and environmental protection. In this work, we designed and synthesized a new amino-decorated bridging ligand H2 APDA and employed it to react with the environmentally friendly Mg(II) ions to construct a novel magnesium luminescent metal-organic framework (Mg-LMOF), namely [Mg2 (APDA)2 (H2 O)3 ]·5DMA·5H2 O (Mg-APDA)...
October 18, 2018: Inorganic Chemistry
Jiani Huang, Ning Li, Chunmei Zhang, Zhaowei Meng
Metal-organic frameworks (MOFs) have been applied in chemotherapeutic drug loading for cancer treatment, but challenging for cases with large and malignant lesions. To overcome these difficulties, combinational therapies of chemotherapy and photothermal therapy (PTT) with potentially high selectivity and slight aggressiveness have drawn tremendous attention to treat various tumors. However, current MOFs-based nanohybrids with photothermal agents suffer from tedious synthesis process and heterogeneous structure...
October 18, 2018: ACS Applied Materials & Interfaces
Zhengyun Wang, Ting Liu, Yang Yu, Muhammad Asif, Ning Xu, Fei Xiao, Hongfang Liu
The emergence of metal-organic frameworks (MOFs) has sparked intensive attention and opened up the possibility of "crystal engineering." However, low conductivity, slow diffusion of guest molecules, as well as powder forms always hinder the development of MOF application, especially for biosensors and bioelectronics. Herein, a coffee ring-inspired strategy toward oriented self-assembly of a biomimetic MOF film following Murray's law is proposed, which can effectively reduce the transfer resistance...
October 18, 2018: Small
Wen-Yang Gao, Ashley D Cardenal, Chen-Hao Wang, David C Powers
The potential to exert atomistic control over the structure of site-isolated catalyst sites as well as the topology and chemical environment of interstitial pore spaces has inspired efforts to apply porous metal-organic frameworks (MOFs) as catalysts for fine chemical synthesis. In analogy to enzyme-catalyzed reactions, MOF catalysts have been proposed as platforms in which substrate confinement could be used to achieve chemo- and stereoselectivities that are orthogonal to solution-phase catalysts. In order to leverage the tunable pore topology of MOFs to impact catalyst selectivity, catalysis must proceed at interstitial catalyst sites rather than at solvent-exposed interfacial sites...
October 18, 2018: Chemistry: a European Journal
Bin Qi, Xin Li, Liang Sun, Bo Chen, Hao Chen, Chenchen Wu, Haibo Zhang, Xiaohai Zhou
Supramolecular nano-assemblies with tunable morphology have attracted extensive attention in composite material manufacturing and many other fields. Herein, a new class of shape-controlled dodecaborate-based supramolecular organic frameworks (BOFs), decorated with diverse ultrafine noble metal clusters (Au, Pd, Pt, Ag), has been successfully fabricated via the tunable host-guest assembly of cucurbit[n = 5,6,7,8]uril and Cs2[closo-B12H12]. Due to the unique dodecaborate-cucurbit[n]uril chaotropic effect, a breakthrough has been made in modulating the supramolecular frameworks in the urchin-like, network-like or octahedron-like structures without tedious chemical modifications or additional additives...
October 18, 2018: Nanoscale
Enamul Haque, Yusuke Yamauchi, Victor Malgras, Kakarla Raghava Reddy, Jin Woo Yi, Md Shahriar A Hossain, Jeonghun Kim
Graphene-organic frameworks (GOFs) is a new class of graphene-based materials in which structure and properties can be designed by controlling the length and concentration of organic ligands, comparable to their tunable metal-organic frameworks (MOFs) counterpart. The structural properties (e.g., surface area, pore volume) and physico-chemical properties (e.g., electronic, thermal, and mechanical) of GOFs can be tuned based on the synthetic conditions. Such GOFs are promising as the next generation of novel materials for a wide range of potential applications such as H2 storage, electronic devices, sensors, drug carriers, etc...
October 18, 2018: Chemistry, An Asian Journal
Shuai Chen, Qixian Chen, Shuqi Dong, Jianbiao Ma, Ying-Wei Yang, Li Chen, Hui Gao
UiO-66-based metal-organic framework nanoparticles functionalized with abundant polycationic segments as polymer brushes on surface are created to load negatively charged functional entities composed of anticancer drug, doxorubicin (DOX), and aggregation-induced emissive luminogen, a tetraphenylethene (TPE) derivative, followed by further modification with cucurbit[7]uril (CB[7]) as a supramolecular glue with the aim of pursuing a pH-responsive release function of the loaded functional components. The subsequent investigations verified the constructed formulation capable of promoting the stability and cellular uptake of the nanoparticles...
October 17, 2018: Macromolecular Bioscience
Sabrina Fischer, Jérôme Roeser, Terri Lin, Ryan H DeBlock, Jonathan Lau, Bruce S Dunn, Frank Hoffmann, Michael Fröba, Arne Thomas, Sarah H Tolbert
We demonstrate the synthesis of the first anionic aluminum metal-organic framework (MOFs) constructed from tetrahedral AlO4 sites. Al-Td-MOF-1 was obtained in a simple two-step synthesis by condensation of 1,4-dihydroxybenzene and lithium aluminum hydride into an amorphous aluminate framework before applying a solvothermal treatment under basic conditions to obtain the crystalline Al-Td-MOF-1 with a chemical composition of Li[Al(C6H4O2)2]. The overall Al-Td-MOF-1 structure consists of one-dimensional chains of alternating edge-sharing AlO4 and LiO4 tetrahedral sites describing unidirectional pore channels with a square window aperture of ~ 5 x 5 Å2, best described topologically as a uninodal 6-coordinated snp rod net...
October 17, 2018: Angewandte Chemie
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