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Kat8 OR MOF OR Myst1

Zahra Safaei Moghaddam, Massoud Kaykhaii, Mostafa Khajeh, Ali Reza Oveisi
In this study, a zirconium-based metal-organic framework (Zr-MOF), named UiO-66-OH, was synthesized by the solvo-thermal method and characterized by Fourier transform-infrared spectroscopy (FTIR), powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM). This Zr-MOF was then employed as a sorbent for selective extraction and preconcentration of thorium ions after their complexation with 2‑(2,4‑dihydroxyphenyl)‑3,5,7‑trihydroxychromen‑4‑one (morin) from environmental water samples prior to its spectrophotometrical determination...
January 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Zhenhua Wang, Qianwang Chen
A MOF material, Co3[Co(CN)6]2 nanoparticles has been prepared for the effective detection of ethanol in vapor phase. When exposed to ethanol vapor, the material was changed from pink to purple, which is easily observed by naked eyes directly. We propose that the ethanol response is due to ethanol molecules entering the pores of the solid, where they alter the coordination geometry, leading to conversion of their Co centers from octahedral to tetrahedral coordination. Significantly, the change is reversible, which make the material reusable without subjecting to dynamic vacuum or slightly warming...
December 30, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Dan Shao, Jinbiao Shi, Jianling Zhang, Xiuniang Tan, Tian Luo, Xiuyan Cheng, Bingxing Zhang, Buxing Han
The catalytic performance of metal-organic frameworks (MOFs) for the synthesis of cyclic carbonate from carbon dioxide and epoxides has been explored in solvent and solvent-free conditions, respectively. It was found that MOF catalysts have significantly improved catalytic activities in solvent-free CO2 cycloaddition reactions than those in solvent. The mechanism was discussed from the competition of solvent with substrate to adhere MOF catalysts during reaction process.
January 13, 2018: Chemistry, An Asian Journal
Caihong Wang, Jie Gao, Yili Cao, Hongliang Tan
Nanozymes have been extensively exploited in the construction of colorimetric sensors in the past decade. However, as lack of specific recognition element, these sensors are mostly limited in the detection of hydrogen peroxide and its related agents. In this work, a colorimetric assay for the detection of alkaline phosphatase (ALP) activity was developed by employing copper (II)-based metal-organic frameworks (Cu-MOFs) as peroxidase mimic and pyrophosphate (PPi) as recognition element. Benefiting from its intrinsic porosity, Cu-MOFs built from one-step self-assembly showed a superior catalytic activity over horseradish peroxidase...
April 3, 2018: Analytica Chimica Acta
Shu-Yin Zhu, Bing Yan
A modified MOF named UiO-66-NH2-SA was synthesized based on the covalent post synthetic attachment of the MOFs (UiO-66-NH2) and salicylaldehyde via a Schiff-base reaction. The as-prepared functionalized UiO-66-NH2-SA not only maintains its structural integrity during the PSM process, but also shows excellent luminescence and good fluorescence stability in water. It was further utilized as a novel fluorescent probe for detecting of Al3+. The fluorescence intensity of UiO-66-NH2-SA increased linearly upon increasing the concentration of Al3+ in the range of 0-500 μM with a detection limit of 6...
January 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yang-Tian Yan, Wen-Yan Zhang, Fang Zhang, Feng Cao, Rui-Feng Yang, Yao-Yu Wang, Lei Hou
Four new metal-organic frameworks (MOFs), {[Zn3(L)(OH)(H2O)5]·NMP·2H2O}n (1), {[H2N(Me)2][Zn2(L)(H2O)]·DMF·H2O}n (2), {[Co5(L)2(H2O)11]·2H2O}n (3) and {[Mn5(L)2(H2O)12]·6H2O}n (4), were assembled employing a symmetrical V-shaped rigid multicarboxylic acid ligand H5L (H5L = 2,4-di(3',5'-dicarboxylphenyl)benzoic acid) with different metal ions, resulting in versatile frameworks as well as various types of coordination modes of H5L. 1 forms a three-dimensional (3D) 4-connected sra net based on trinuclear [Zn3(μ3-OH)(μ2-COO)(μ1-COO)4] clusters, while 2 displays a 3D (4,6)-connected net based on two types of binuclear [Zn2(μ2-COO)2(μ1-COO)4] and [Zn2(μ2-COO)4] clusters...
January 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Kui Shen, Lei Zhang, Xiaodong Chen, Lingmei Liu, Daliang Zhang, Yu Han, Junying Chen, Jilan Long, Rafael Luque, Yingwei Li, Banglin Chen
We constructed highly oriented and ordered macropores within metal-organic framework (MOF) single crystals, opening up the area of three-dimensional-ordered macro-microporous materials (that is, materials containing both macro- and micropores) in single-crystalline form. Our methodology relies on the strong shaping effects of a polystyrene nanosphere monolith template and a double-solvent-induced heterogeneous nucleation approach. This process synergistically enabled the in situ growth of MOFs within ordered voids, rendering a single crystal with oriented and ordered macro-microporous structure...
January 12, 2018: Science
Martin D Rosenthal, Amir Y Kamel, Cameron M Rosenthal, Scott Brakenridge, Chasen A Croft, Frederick A Moore
Over the last decade, chronic critical illness (CCI) has emerged as an epidemic in intensive care unit (ICU) survivors worldwide. Advances in ICU technology and implementation of evidence-based care bundles have significantly decreased early deaths and have allowed patients to survive previously lethal multiple organ failure (MOF). Many MOF survivors, however, experience a persistent dysregulated immune response that is causing an increasingly predominant clinical phenotype called the persistent inflammation, immunosuppression, and catabolism syndrome (PICS)...
January 11, 2018: Nutrition in Clinical Practice
Jie Ying, Annika Herbst, Yu-Xuan Xiao, Hao Wei, Ge Tian, Zhaofei Li, Xiao-Yu Yang, Bao-Lian Su, Christoph Janiak
The metal-organic framework (MOF) MIL-101Cr was readily encapsulated by a very thin shell (around 30 nm) of hydrophobic mesoporous silica, which replicates the irregular shape of the MOF nanocrystals. Such a silica shell facilitates the diffusion of hydrophobic reactants with enhancement of the catalytic activity of the MOF and significantly improved catalytic stability of the MOF in the oxidation of indene.
January 11, 2018: Inorganic Chemistry
Qiyang Li, Xiuju Wu, Xiaoli Huang, Yangjun Deng, Nanjian Chen, Dandan Jiang, Lili Zhao, Zhihua Lin, Yonggang Zhao
A hydroxyl functionalized ligand was designed for the construction of MOF materials with aggregation-induced emission (AIE) feature, in which the fluorescence can be deliberately tailored: quenching the fluorescence to an "off" state by the decoration with heterocyclic auxiliary ligand 4,4'-bypyridine (Bpy) in the framework as quenching agent; triggering the enhanced fluorescence to an "on" state by removal of Bpy through the metal competitive coordination substitution strategy. Our study shows that the occurrence of exciton migration between the AIE linker and the conjugated auxiliary ligand Bpy cause the fluorescence quenching...
January 11, 2018: ACS Applied Materials & Interfaces
Pei Nian, Yujia Li, Xiang Zhang, Yi Cao, Hai-Ou Liu, Xiongfu Zhang
Up to now, the fabrication of well-intergrown Co-based ZIFs membranes on porous tubular supports is still a major challenge. We report here a heteroepitaxial growth for preparing well-intergrown Co-based ZIFs (ZIF-67 and ZIF-9) tubular membranes with high performance and excellent thermal stability by employing a thin layer of ZnO nanorods acting as both nucleation centers and anchor sites for the growth of MOF membranes. The results show that well-intergrown Co-ZIF-67 and Co-ZIF-9 membranes, respectively, are successfully achieved on the ZnO nanorods modified porous ceramic tubes...
January 11, 2018: ACS Applied Materials & Interfaces
Takumi Ishiwata, Ayano Michibata, Kenta Kokado, Sylvie Ferlay, Mir Wais Hosseini, Kazuki Sada
New polymer capsules (PCs) were obtained using a crystal crosslinking (CC) method on core-shell MOF crystals. The latter are based on the epitaxial growth of two isostructural coordination polymers which are then selectively crosslinked. Decomposition of the non-reticulated phase leads to new PCs, possessing a well-defined hollow cubic shape reflecting the heterostructure of the template.
January 11, 2018: Chemical Communications: Chem Comm
Kuo Yuan, Tianqun Song, Dawei Wang, Ye Zou, Jinfeng Li, Xiaotao Zhang, Zhiyong Tang, Wenping Hu
In this work, we synthesized a series of microcrystalline MnxN100-x-MOF-74 (N = Fe, Co and Ni) materials by a one-pot reaction. Powder X-ray diffraction (PXRD) patterns of MnxN100-x-MOF-74 matched well with those of single-metal MOF-74, and the scanning electron microscopy (SEM) images exhibited homogeneous nanocrystallites aggregated together. The amounts and dispersion of metals were analyzed by using inductively coupled plasma (ICP) and energy-dispersive X-ray spectroscopy (EDS), separately. MnxN100-x-MOF-74 could remain crystalline and efficiently catalyze the epoxidation of alkenes in DMF with NaHCO3 and 30% H2O2...
January 11, 2018: Nanoscale
Jian Wang, Yanhong Liu, Min Jiang, Yang Li, Lingling Xia, Pengyan Wu
A novel aldehyde-functionalized porous metal-organic framework (MOF) material has been constructed that can act as the first example of MOF-implicated sensors for discriminating Hcy from natural amino acids and even thiol-related peptides (GSH) with high sensitivity (LOD = 40 nM). The sensing mechanism is also discussed.
January 11, 2018: Chemical Communications: Chem Comm
Xu-Jia Hong, Tian-Xiong Tan, Yu-Kai Guo, Xue-Ying Tang, Jian-Yi Wang, Wei Qin, Yue-Peng Cai
A lithium-sulfur (Li-S) battery is regarded as the most promising candidate for next generation energy storage systems, because of its high theoretical specific capacity (1675 mA h g-1) and specific energy (2500 W h kg-1), as well as the abundance, low cost and environmental benignity of sulfur. However, the soluble polysulfides Li2Sx (4 ≤ x ≤ 8) produced during the discharge process can cause the so-called "shuttle effect" and lead to low coulombic efficiency and rapid capacity fading of the batteries, which seriously restrict their practical application...
January 11, 2018: Nanoscale
Haiwei Li, Xiao Feng, Dou Ma, Mengxi Zhang, Yuanyuan Zhang, Yi Liu, Jinwei Zhang, Bo Wang
Three new Al-MOFs in the formation of [Al4(OH)2(OCH3)4(OH-BDC)3]·xH2O (BIT-72), [Al4(OH)2(OCH3)4(CH3-BDC)3]·xH2O (BIT-73) and {Al4(OH)2(OCH3)4[(CH3)2-BDC]3}·xH2O (BIT-74) have been synthesized by assembling Al3+ ion with terephthalic acid ions decorated with monohydroxyl, monomethyl or dimethyl groups, respectively. All of these three MOFs exhibit high stability in boiling water and acidic conditions. Among them, BIT-72 shows the highest surface area of 1618 m2·g-1 and IAST CO2/N2 selectivity of 48, while BIT-73 and BIT-74 present moderate IAST CO2/N2 selectivity and much lower H2O capacity below P/P0 = 0...
January 11, 2018: ACS Applied Materials & Interfaces
Zhen Han, Hong Wu, Sunjoo Kim, Xiangkun Yang, Qianjin Li, He Huang, Houjian Cai, Michael G Bartlett, Aiping Dong, Hong Zeng, Peter J Brown, Xiangjiao Yang, Cheryl H Arrowsmith, Yingming Zhao, Y George Zheng
Short-chain acylation of lysine residues recently emerges as a group of reversible posttranslational modifications in mammalian cells. The diversity of acylation further broadens the landscape and complexity of the proteome. Identification of regulatory enzymes and effector proteins for lysine acylation is critical to understand functions of these novel modifications at the molecular level. Here, we report that the MYST family of lysine acetyltransferases (KATs) possesses strong propionyltransferase activity both in vitro and in cellulo...
January 10, 2018: Journal of Biological Chemistry
Bing-Bing Lu, Jin Yang, Guang-Bo Che, Wen-Yuan Pei, Jian-Fang Ma
A new highly stable copper(I)-based metal-organic framework (MOF), namely, [CuI4(SiW12O40)(L)]·6H2O·2DMF (1), was synthesized by incorporating Keggin-type polyoxometalate (POM) anions and a functionalized wheel-like resorcin[4]arene-based ligand (L) under sovothermal condition. 1 exhibits a charming 3D supramolecular architecture sandwiched by the POM anions. Noticeably, 1 has exceptional chemical stability, especially in organic solvents or aqueous solutions with a wide range of pH values. Considering the catalytically active Cu(I) sites in 1, the azide-alkyne cycloaddition (AAC) reaction was studied by employing 1 as the heterogeneous catalyst...
January 10, 2018: ACS Applied Materials & Interfaces
Bangguo Peng, Jiewu Cui, Yan Wang, Jiaqin Liu, Hongmei Zheng, Li Jin, Xinyi Zhang, Yong Zhang, Yucheng Wu
Developing suitable substrate materials is of significance in constructing electrochemical biosensors for fast and reliable quantification of molecules of chemical and biomedical interest. For practical applications, biosensors working at low negative potentials have the advantage of high selectivity and sensitivity. In this work, CeO2-x/C/rGO nanocomposites have been synthesized through the pyrolysis of metal organic frameworks with graphene oxide. The CeO2-x/C/rGO nanocomposites exhibit excellent catalytic properties towards H2O2, which is one of the uricase catalyzed intermediates at low working potentials due to the coexistence of Ce3+ and reduced graphene oxide (rGO)...
January 10, 2018: Nanoscale
Robin Babu, Jintu Francis Kurisingal, Jong-San Chang, Dae-Won Park
A pyridinium-based ionic liquid-decorated 1D MOF (IL-[In2(dpa)3(1,10-phen)2]) was developed as a bifunctional heterogeneous catalyst system for CO2-oxirane coupling reactions. An aqueous-microwave route was employed as competent with the hydrothermal pathway for the synthesis of [In2(dpa)3(1,10-phen)2] MOF, and the IL-[In2(dpa)3(1,10-phen)2] catalyst was synthesized using the covalent post functionalization method. Due to the synergetic effect of dual functional sites, including Lewis acid sites (coordinatively unsaturated indium sites) and I- ion in IL functional sites, IL-[In2(dpa)3(1,10-phen)2] displayed high catalytic activity for CO2-epoxide cycloaddition reactions under mild and solvent free conditions...
January 6, 2018: ChemSusChem
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