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https://www.readbyqxmd.com/read/28230984/2d-conductive-iron-quinoid-magnets-ordering-up-to-tc-105-k-via-heterogenous-redox-chemistry
#1
Jordan A DeGayner, Ie-Rang Jeon, Lei Sun, Mircea Dinca, T David Harris
We report the magnetism and conductivity for a redox isomeric pair of iron-quinoid metal-organic frameworks (MOFs). The oxidized isomer, (Me2NH2)2[Fe2L3]·2H2O·6DMF (LH2 = 2,5-dichloro-3,6-dihydroxo-1,4-benzoquinone) was previously shown to magnetically order below 80 K in its solvated form, with the ordering temperature decreasing to 26 K upon desolvation. Here, we demonstrate this compound to exhibit electrical conductivity values up to σ = 1.4(7) × 10(-2) S/cm (Ea = 0.26(1) cm(-1)) and 1.0(3) × 10(-3) S/cm (Ea = 0...
February 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28230916/design-principles-for-covalent-organic-frameworks-as-efficient-electrocatalysts-in-clean-energy-conversion-and-green-oxidizer-production
#2
Chun-Yu Lin, Lipeng Zhang, Zhenghang Zhao, Zhenhai Xia
Covalent organic frameworks (COFs), an emerging class of framework materials linked by covalent bonds, hold potential for various applications such as efficient electrocatalysts, photovoltaics, and sensors. To rationally design COF-based electrocatalysts for oxygen reduction and evolution reactions in fuel cells and metal-air batteries, activity descriptors, derived from orbital energy and bonding structures, are identified with the first-principle calculations for the COFs, which correlate COF structures with their catalytic activities...
February 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28229152/an-anionic-metal-organic-framework-with-ternary-building-units-for-rapid-and-selective-adsorption-of-dyes
#3
Shuo Yao, Tong Xu, Nian Zhao, Lirong Zhang, Qisheng Huo, Yunling Liu
A novel metal-organic framework, [(CH3)2NH2]2[Cu3O(SO4)3Cu2L2(DMF)(H2O)]·9DMF (JLU-Liu39) H2L = pyridine-3,5-bis(phenyl-4-carboxylic acid), has been successfully synthesized under solvothermal conditions. Structure analysis indicates that the framework of JLU-Liu39 is constructed by ternary building units which include a rare hexa-nuclear [Cu6O2(SO4)6] cluster, a classical [Cu2(CO2)4] paddlewheel, and a 3-connected hetero-N, O donor ligand. The whole 3D framework possesses a (3,4,4)-connected fjh topology and a large window size of 25...
February 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28225602/exploring-the-detection-of-metal-ions-by-tailoring-the-coordination-mode-of-v-shaped-thienylpyridyl-ligand-in-three-mofs
#4
Li-Juan Han, Wei Yan, Shu-Guang Chen, Zhen-Zhen Shi, He-Gen Zheng
By employing a rational design approach, we synthesized three luminescent metal-organic frameworks (MOFs) 1-3 affording different coordination modes of V-shaped thienylpyridyl ligand. Their application in detecting metal ions was explored, and the mechanism was inferred. And the result exhibits that MOF 3 is a dual-responsive luminescent probe for Fe(3+) and Al(3+) ions.
February 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28224149/two-new-metal-organic-frameworks-based-on-tetrazole-heterocyclic-ligands-accompanied-by-in-situ-ligand-formation
#5
Qin Li, Mei-Hui Yu, Jian Xu, Ai-Lin Li, Tong-Liang Hu, Xian-He Bu
Based on the same in situ formed ligand, two new MOFs, namely {[Zn2(HL)2]·0.5DMF·H2O}n (1) and {[Cd2(HL)2]·1.5H2O}n (2) (H3L = 5-[(2H-tetrazol-5-yl)amino]isophthalic acid), have been solvothermally synthesized and structurally characterized by elemental analysis, IR, PXRD, and single-crystal X-ray diffraction. During the self-assembly process, the original ligand H2ATBDC (5-(5-amino-1H-tetrazol-1-yl)-1,3-benzenedicarboxylic acid) undergoes the Dimroth rearrangement to form a new ligand H3L, consequently contributing to the construction of the two new MOFs...
February 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28223705/porous-materials-lining-up-metal-organic-frameworks
#6
Neil R Champness
No abstract text is available yet for this article.
February 22, 2017: Nature Materials
https://www.readbyqxmd.com/read/28221797/acid-gas-adsorption-on-metal-organic-framework-nanosheets-as-a-model-of-an-all-surface-material
#7
Joshua D Howe, Yang Liu, Luis Flores, David A Dixon, David S Sholl
To establish a model of metal-organic framework (MOF) surfaces and build an understanding of surface-specific ligand adsorption phenomena in MOFs, we present a computational study exploring multiple models of a series of MOF-2 nanosheet materials, "M-BDCs", with M = Zn, Cu, and Co and BDC = benzene-1,4-dicarboxylate. We study and assess the appropriateness of a series of models ranging from small clusters (18 atoms) to fully periodic sheet models. We additionally study the interactions of these models with acid gases and energy-relevant small molecules (CO, CO2, H2O, SO2, NO2, and H2S)...
February 21, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28220694/selective-fluorogenic-sensing-of-as-iii-using-aptamer-capped-nanomaterials
#8
Mar Oroval, Carmen Coll, Andrea Bernardos, María Dolores Marcos, Ramon Martinez-Manez, Dmitry G Shchukin, Felix Sancenón
Organic-inorganic hybrid nanomaterials offer extremely valuable tools for monitoring many types of analytes in in solution. Within this framework, aptamer-based nanomaterials for heavy metal detection are still very scarce. Herein, a novel sensing nanoprobe for the selective and sensitive detection of As(III) based on the combination of aptamers with mesoporous silica nanoparticles has been developed. The efficiency of the sensor is demonstrated in environmental conditions, showing a great potential in As(III) monitoring assays...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28218922/unravelling-surface-and-interfacial-structures-of-a-metal-organic-framework-by-transmission-electron-microscopy
#9
Yihan Zhu, Jim Ciston, Bin Zheng, Xiaohe Miao, Cory Czarnik, Yichang Pan, Rachid Sougrat, Zhiping Lai, Chia-En Hsiung, Kexin Yao, Ingo Pinnau, Ming Pan, Yu Han
Metal-organic frameworks (MOFs) are crystalline porous materials with designable topology, porosity and functionality, having promising applications in gas storage and separation, ion conduction and catalysis. It is challenging to observe MOFs with transmission electron microscopy (TEM) due to the extreme instability of MOFs upon electron beam irradiation. Here, we use a direct-detection electron-counting camera to acquire TEM images of the MOF ZIF-8 with an ultralow dose of 4.1 electrons per square ångström to retain the structural integrity...
February 20, 2017: Nature Materials
https://www.readbyqxmd.com/read/28218536/polar-ketone-functionalized-metal-organic-framework-showing-a-high-co2-adsorption-performance
#10
Genfeng Feng, Yuxin Peng, Wei Liu, Feifan Chang, Yafei Dai, Wei Huang
The incorporation of various functionalities into porous metal-organic frameworks (MOFs) represents an efficacious strategy to improving their gas adsorption properties. In this work, a carbonylated tetracarboxylic acid ligand (5,5'-carbonyldiisophthalic acid) was synthesized, and a ketone-functionalized MOF with exposed metal sites based on this ligand was formed successfully. Structural analysis reveals that the new MOF possesses channels decorated by the carbonyl groups and rhombicuboctahedral cages, with open Cu(II) sites pointing toward the cage center...
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28218528/a-water-stable-anionic-metal-organic-framework-constructed-from-columnar-zinc-adeninate-units-for-highly-selective-light-hydrocarbon-separation-and-efficient-separation-of-organic-dyes
#11
Hui-Fang Ma, Qing-Yan Liu, Yu-Ling Wang, Shun-Gao Yin
A metal-organic framework (MOF), {(Me2NH2)2[Zn6(μ4-O)(ad)4(BPDC)4]}n (JXNU-4; ad(-) = adeninate), with an anionic three-dimensional (3D) framework constructed from one-dimensional (1D) columnar [Zn6(ad)4(μ4-O)]n secondary building units (SBUs) and 4,4'-biphenyldicarboxylate (BPDC(2-)) ligand, was prepared. The anionic 3D framework has 1D square channels with an aperture of about 9.8 Å and exhibits a carboxylate-O-decorated pore environment. The microporous nature of JXNU-4 was established by the N2 adsorption data, which gives Langmuir and Brumauer-Emmett-Teller surface areas of 1800 and 1250 m(2) g(-1), respectively...
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28218491/a-new-class-of-lasing-materials-intrinsic-stimulated-emission-from-nonlinear-optically-active-metal-organic-frameworks
#12
Raghavender Medishetty, Venkatram Nalla, Lydia Nemec, Sebastian Henke, David Mayer, Handong Sun, Karsten Reuter, Roland A Fischer
Blue-color stimulated emission with low threshold power is observed from In- and Zn-MOFs, which feature a highly fluorescent chromophore densely packed and rigidly linked to the metal-ion centers in the solid state. The density-of-states and transition dipole moments are calculated and the stimulated emission phenomenon is correlated with these properties.
February 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28217998/a-mixed-cluster-approach-for-building-a-highly-porous-cobalt-ii-isonicotinic-acid-framework-gas-sorption-properties-and-computational-analyses
#13
Di-Ming Chen, Nan-Nan Zhang, Chun-Sen Liu, Zhi-Hao Jiang, Xing-Dong Wang, Miao Du
A unique channel-type metal-organic framework (MOF) built up from mixed square-planar Co4(μ2-OH)4(μ4-OH) and cuboidal Co4(μ3-OH)4 clusters with an isonicotinic acid ligand has been successfully fabricated that demonstrates the highest specific surface area and high H2 uptake capacities among all of the cobalt(II) isonicotinic acid frameworks reported so far.
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28214103/tracking-the-evolution-and-differences-between-guest-induced-phases-of-ga-mil-53-via-ultra-wideline-69-71-ga-solid-state-nmr-spectroscopy
#14
Yue Zhang, Bryan E G Lucier, Victor V Terskikh, Renlong Zheng, Yining Huang
Ga-MIL-53 is a metal-organic framework (MOF) that exhibits a "breathing effect," in which the pore size and overall MOF topology can be influenced by temperature, pressure, and host-guest interactions. The phase control afforded by this flexible framework renders Ga-MIL-53 a promising material for guest storage and sensing applications. In this work, the structure and behavior of four Ga-MIL-53 phases (as, ht, enp and lt), along with CO2 adsorbed within Ga-MIL-53 at various loading levels, has been investigated using (69/71)Ga solid-state NMR (SSNMR) experiments at 21...
January 31, 2017: Solid State Nuclear Magnetic Resonance
https://www.readbyqxmd.com/read/28213709/high-efficiency-removal-of-triclosan-by-structure-directing-agent-modified-mesoporous-mil-53-al
#15
Rongni Dou, Junya Zhang, Yuancai Chen, Siyuan Feng
In order to expand the potential applications of metal-organic frameworks (MOFs), structure directing agents modified mesoporous MIL-53(Al) (MIL-53(Al)-1) was investigated to adsorb triclosan (TCS) with two different initial concentrations. MIL-53(Al)-1 with high mesoporosity and total pore volume exhibited higher adsorption capacity and 4.4 times faster adsorption of TCS at low concentration (1 mg L(-1)) than that of microporous MIL-53(Al). Also, mesoporous as well as microporous MIL-53(Al) showed significant higher adsorption capacity and two orders of magnitude greater fast uptake of TCS than two kinds of mesoporous-activated carbon...
February 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28213257/a-zeolitic-imidazolate-framework-based-nanoporous-carbon-as-a-novel-fiber-coating-for-solid-phase-microextraction-of-pyrethroid-pesticides
#16
Shuaihua Zhang, Qian Yang, Xiumin Yang, Wenchang Wang, Zhi Li, Lihong Zhang, Chun Wang, Zhi Wang
A high-surface-area nanoporous carbon (NPC) has been successfully synthesized by using the metal-organic framework ZIF-90 as both the template and precursor together with furfuryl alcohol as a secondary carbon source. The prepared ZIF-90 templated NPC (ZIF-90-NPC) was then coated onto a stainless steel wire by a simple physical adhesion approach to prepare solid-phase microextraction (SPME) fiber. By coupling the ZIF-90-NPC coated fiber-based SPME with gas chromatography-microelectron capture detection (GC-μECD), the developed method gave a large enhancement factor (984-2869), low limit of detection (0...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213213/titanium-iv-ion-modified-covalent-organic-frameworks-for-specific-enrichment-of-phosphopeptides
#17
Heping Wang, Fenglong Jiao, Fangyuan Gao, Yayao Lv, Qiong Wu, Yan Zhao, Yehua Shen, Yangjun Zhang, Xiaohong Qian
To date, plenty of new alternative materials for phosphopeptides enrichment prior to mass spectrometry (MS) analysis appear, especially immobilized metal ion affinity chromatography (IMAC) materials. The variable combinations with different metal ions, chelating ligands and solid supports offer full of optionality for IMAC. However, further improvement was predicted by the tedious and complex synthetic process. In this work, a novel covalent organic framework (COF)-based IMAC material (denoted TpPa-2-Ti(4+)) was prepared simply by direct immobilizing Ti (IV) into TpPa-2 COFs without any extra chelating ligands...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28212011/a-fluorescent-anionic-mof-with-zn4-trz-2-chain-for-highly-selective-visual-sensing-of-contaminants-cr-iii-ion-and-tnp
#18
Xiao-Xia Jia, Ru-Xin Yao, Fu-Qiang Zhang, Xian-Ming Zhang
Heavy-metal ions and nitroaromatic substances are highly toxic and harmful to human health and the ecological environment. It is an urgent issue to selectively detect and capture these toxic substances. By introducing the triazole ligand to the π-conjugated aromatic carboxylate system and borrowing the organic template open framework idea, a stable fluorescent framework [Me2NH2]4[Zn6(qptc)3(trz)4]·6H2O (1) (H4qptc = terphenyl-2,5,2'5'-tetracarboxylic acid, trz = 1,2,4-triazole) has been successfully synthesized, which features Zn4(trz)2 chain-based 3D anionic structure with channels filled by [Me2NH2](+) cations...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28212009/2-2-bipyridyl-embedded-cycloparaphenylenes-as-a-general-strategy-to-investigate-nanohoop-based-coordination-complexes
#19
Jeff Van Raden, Shayan Louie, Lev N Zakharov, Ramesh Jasti
Owing to their unique cyclic architectures, tunable electronic properties, and supramolecular chemistries, cycloparaphenylenes (CPPs) have the potential to act as a new class of ligands for coordination cages, metal-organic frameworks (MOFs), as well as small-molecule transition-metal complexes. However, currently there is no general strategy to coordinate the cyclic framework to a variety of metal centers. We report here a general and scalable synthetic strategy to embed 2,2'-bipyridine units into the backbone of CPPs...
February 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28211689/a-stable-porphyrin-based-porous-mog-metal-organic-framework-as-an-efficient-solvent-free-catalyst-for-c-c-bond-formation
#20
Wei Jiang, Jin Yang, Ying-Ying Liu, Shu-Yan Song, Jian-Fang Ma
We herein report the porous 4-fold interpenetrated mog (moganite) metal-organic framework (MOF) [Cd3(tipp)(bpdc)2]·DMA·9H2O (1·Cd; H2tipp = 5,10,15,20-tetrakis(4-(imidazol-1-yl)phenyl)porphyrin, H2bpdc = biphenyl-4,4'-dicarboxylic acid, DMA = N,N'-dimethylacetamide). The incorporation of Cd and carboxylate oxygen affords 1·Cd rich Lewis acid and basic sites. This MOF 1·Cd was then applied as an efficient heterogeneous catalyst for the important cyanosilylation of aldehydes and Knoevenagel condensation reactions...
February 17, 2017: Inorganic Chemistry
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