scholarly journals Recent Advances in the Application of Metal–Organic Frameworks for Polymerization and Oligomerization Reactions

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1441
Author(s):  
Fangyu Ren ◽  
Pengfei Ji
Keyword(s):  
Metal Organic Framework ◽  
Chemical Properties ◽  
Value Added ◽  
Structural Diversity ◽  
Future Design ◽  
Catalytic Active Site ◽  
Metal Organic ◽  
Templating Effect ◽  
Structural Aspects ◽  
And Chemical Properties

Polymers have become one of the major types of materials that are essential in our daily life. The controlled synthesis of value-added polymers with unique mechanical and chemical properties have attracted broad research interest. Metal–organic framework (MOF) is a class of porous material with immense structural diversity which offers unique advantages for catalyzing polymerization and oligomerization reactions including the uniformity of the catalytic active site, and the templating effect of the nano-sized channels. We summarized in this review the important recent progress in the field of MOF-catalyzed and MOF-templated polymerizations, to reveal the chemical principle and structural aspects of these systems and hope to inspire the future design of novel polymerization systems with improved activity and specificity.

Thiol Decorated Defective Metal-Organic Framework Embedded with Palladium Nanoparticles for Efficient Cr(VI) Reduction

2021 ◽  
Author(s):  
Sukhendu Mandal ◽  
Asha P. ◽  
R. K. Aparna ◽  
Balu P Ratheesh ◽  
Manju M Maman
Keyword(s):  
Palladium Nanoparticles ◽  
Metal Organic Framework ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Metal Organic ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Organic Framework

Engineering defective UiO-66 with functionalized modulator may create functionality with promising physical and chemical properties. Herein, we use 2-mercaptobenzoic acid (2-MBA) as a modulator for the functionalization of defective UiO-66...

Metal Organic Framework Derived Porous Carbon Materials Excels as an Excellent Platform for High-performance Packaged Supercapacitors

Nanoscale ◽  
2021 ◽  
Author(s):  
Xianyu Chu ◽  
Fanling Meng ◽  
Ting Deng ◽  
Wei Zhang
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
Metal Organic Framework ◽  
Chemical Properties ◽  
Porous Carbon Material ◽  
Metal Organic ◽  
Key Steps ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Organic Framework

Designing and synthesizing new materials with special physical and chemical properties are the key steps to assembling high performance supercapacitors. Metal organic framework (MOF) derived porous carbon material has drawn...

scholarly journals Bio-inspired general synthesis of superplastic metal-organic framework aerogels and their applications

2020 ◽  
Author(s):  
Yuntong Sun ◽  
Shuaishuai Xu ◽  
Junwu Zhu ◽  
sheng chen ◽  
Xin Wang
Keyword(s):  
Structural Integrity ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Hierarchical Architecture ◽  
Natural Seawater ◽  
Free Standing ◽  
Metal Organic ◽  
General Synthesis ◽  
And Chemical Properties

Abstract Many proposed utilizations for metal-organic frameworks (MOFs) demand their assembly into three-dimensional (3D) monolithic architectures. The capability of sustaining structural integrity during considerable deformations is important to allow a monolithic material that works reliably. Nevertheless, it remains a significant challenge to realize high superplasticity in 3D macroscopic MOF networks. Here we report the ice-template-driven assembly of MOF nanobelts to form superelastic MOF-based cellular aerogels. Inspired by the hierarchical architecture of natural cork, the resulting materials can fully and rapidly recover its initial architecture after 50% strain compression and unloading for 2000 cycles. The characteristic hierarchical structure can be extended to single (Ni-, Mn-, and Co-), binary (NiMn-, NiCo-, and CoMn-), and ternary (NiCoMn-) MOF aerogels with exceptionally structural and chemical properties. Potential application has been further demonstrated for NiMn-MOF aerogels in flexible energy conversion, which can effectively electrocatalysize hydrogen evolution in natural seawater even in the presence of considerable electrode deformations. The successful fabrication of such a class of fascinating architectures opens up enormous opportunities for exploring new application of MOFs in a free-standing, structurally adaptive, and macroscopic form

scholarly journals Metal-Organic Framework-Based Stimuli-Responsive Polymers

2021 ◽  
Vol 5 (4) ◽  
pp. 101
Author(s):  
Menglian Wei ◽  
Yu Wan ◽  
Xueji Zhang
Keyword(s):  
Metal Organic Framework ◽  
Chemical Properties ◽  
Stimuli Responsive ◽  
Guest Molecules ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers ◽  
Reversible Phase Transition ◽  
Metal Organic ◽  
External Stimuli ◽  
Organic Framework

Metal-organic framework (MOF) based stimuli-responsive polymers (coordination polymers) exhibit reversible phase-transition behavior and demonstrate attractive properties that are capable of altering physical and/or chemical properties upon exposure to external stimuli, including pH, temperature, ions, etc., in a dynamic fashion. Thus, their conformational change can be imitated by the adsorption/desorption of target analytes (guest molecules), temperature or pressure changes, and electromagnetic field manipulation. MOF-based stimuli responsive polymers have received great attention due to their advanced optical properties and variety of applications. Herein, we summarized some recent progress on MOF-based stimuli-responsive polymers (SRPs) classified by physical and chemical responsiveness, including temperature, pressure, electricity, pH, metal ions, gases, alcohol and multi-targets.

Tuning Packing, Structural Flexibility, and Porosity in 2D Metal–Organic Frameworks by Metal Node Choice

2019 ◽  
Vol 72 (10) ◽  
pp. 797 ◽  
Author(s):  
Witold M. Bloch ◽  
Christian J. Doonan ◽  
Christopher J. Sumby
Keyword(s):  
Structural Changes ◽  
Metal Organic Frameworks ◽  
Chemical Properties ◽  
Complete Removal ◽  
Structural Flexibility ◽  
X Ray Diffraction ◽  
Metal Centre ◽  
Metal Organic ◽  
Physical And Chemical ◽  
And Chemical Properties

Understanding the key features that determine structural flexibility in metal–organic frameworks (MOFs) is key to exploiting their dynamic physical and chemical properties. We have previously reported a 2D MOF material, CuL1, comprising five-coordinate metal nodes that displays exceptional CO2/N2 selectively (L1=bis(4-(4-carboxyphenyl)-1H-pyrazolyl)methane). Here we examine the effect of utilising six-coordinate metal centres (CoII and NiII) in the synthesis of isostructural MOFs from L1, namely CoL1 and NiL1. The octahedral geometry of the metal centre within the MOF analogues precludes an ideal eclipse of the 2D layers, resulting in an offset stacking, and in certain cases, the formation of 2-fold interpenetrated analogues β-CoL1 and β-NiL1. We used a combination of thermogravimetric analysis (TGA), and powder and single crystal X-ray diffraction (PXRD and SCXRD) to show that desolvation is accompanied by a structural change for NiL1, and complete removal of the coordinated H2O ligands results in a reduction in long-range order. The offset nature of the 2D layers in combination with the structural changes impedes the adsorption of meaningful quantities of gases (N2, CO2), highlighting the importance of a five-coordinate metal centre in achieving optimal pore accessibility for this family of flexible materials.

scholarly journals Highly Efficient Nanocarbon Coating Layer on the Nanostructured Copper Sulfide-Metal Organic Framework Derived Carbon for Advanced Sodium-Ion Battery Anode

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1324 ◽  
Author(s):  
Chiwon Kang ◽  
Yongwoo Lee ◽  
Ilhwan Kim ◽  
Seungmin Hyun ◽  
Tae Hoon Lee ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Copper Sulfide ◽  
Large Scale ◽  
Metal Organic Framework ◽  
Specific Capacity ◽  
Chemical Properties ◽  
Sodium Ion ◽  
Physico Chemical ◽  
Metal Organic ◽  
Organic Framework

High theoretical capacity and low-cost copper sulfide (CuxS)-based anodes have gained great attention for advanced sodium-ion batteries (SIBs). However, their practical application may be hindered due to their unstable cycling performance and problems with the dissolution of sodium sulfides (NaxS) into electrolyte. Here, we employed metal organic framework (MOF-199) as a sacrificial template to fabricate nanoporous CuxS with a large surface area embedded in the MOF-derived carbon network (CuxS-C) through a two-step process of sulfurization and carbonization via H2S gas-assisted plasma-enhanced chemical vapor deposition (PECVD) processing. Subsequently, we uniformly coated a nanocarbon layer on the Cu1.8S-C through hydrothermal and subsequent annealing processes. The physico-chemical properties of the nanocarbon layer were revealed by the analytical techniques of high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM). We acquired a higher SIB performance (capacity retention (~93%) with a specific capacity of 372 mAh/g over 110 cycles) of the nanoporous Cu1.8S-C/C core/shell anode materials than that of pure Cu1.8S-C. This encouraging SIB performance is attributed to the key roles of a nanocarbon layer coated on the Cu1.8S-C to accommodate the volume variation of the Cu1.8S-C anode structure during cycling, enhance electrical conductivity and prevent the dissolution of NaxS into the electrolyte. With these physico-chemical and electrochemical properties, we ensure that the Cu1.8S-C/C structure will be a promising anode material for large-scale and advanced SIBs.

scholarly journals Fluorinated Organic Porous Materials

2019 ◽  
Vol 01 (01) ◽  
pp. 019-029 ◽  
Author(s):  
Zhenglin Zhang ◽  
Ognjen Š. Miljanić
Keyword(s):  
Porous Materials ◽  
Organic Molecules ◽  
Metal Organic Frameworks ◽  
Molecular Crystals ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Metal Organic ◽  
Physical And Chemical ◽  
And Chemical Properties

Fluorine is in many aspects unique among the elements, and its incorporation into organic molecules can dramatically change their physical and chemical properties. This minireview will survey the existing classes of fluorinated porous materials, with a particular focus on all-organic porous materials. We will highlight our work on the preparation and study of metal–organic frameworks and porous molecular crystals derived from extensively fluorinated rigid aromatic pyrazoles and tetrazoles. Where possible, comparisons between fluorinated and nonfluorinated materials will be made.

scholarly journals Abatement of Toluene Using a Sequential Adsorption-Catalytic Oxidation Process: Comparative Study of Potential Adsorbent/Catalytic Materials

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 761
Author(s):  
Shilpa Sonar ◽  
Jean-Marc Giraudon ◽  
Savita Kaliya Perumal Veerapandian ◽  
Rim Bitar ◽  
Karen Leus ◽  
...  
Keyword(s):  
Thermal Activation ◽  
Oxidation Process ◽  
Metal Organic Framework ◽  
Chemical Properties ◽  
High Specific Surface Area ◽  
Heating Treatment ◽  
Metal Organic ◽  
Sequential Adsorption ◽  
Novel Strategy ◽  
Adsorption Desorption

A novel strategy for toluene abatement was investigated using a sequential adsorption-regeneration process. Commercial Hopcalite (CuMn2Ox, Purelyst101MD), Ceria nanorods, and UiO-66-SO3H, a metal–organic framework (MOF), were selected for this study. Toluene was first adsorbed on the material and a mild thermal activation was performed afterwards in order to oxidize toluene into CO2 and H2O. The materials were characterized by XRD, N2 adsorption-desorption analysis, H2-TPR and TGA/DSC. The best dynamic toluene adsorption capacity was observed for UiO-66-SO3H due to its hierarchical porosity and high specific surface area. However, in terms of balance between storage and catalytic properties, Hopcalite stands out from others owing to its superior textural/chemical properties promoting irreversible toluene adsorption and outstanding redox properties, allowing a high activity and CO2 selectivity in toluene oxidation. The high conversion of toluene into CO2 which easily desorbs from the surface during heating treatment shows that the sequential adsorption-catalytic thermal oxidation can encompass a classical oxidation process in terms of efficiency, CO2 yield, and energy-cost saving, providing that the bifunctional material displays a good stability in repetitive working conditions.

Engineering Isoreticular 2D Metal–Organic Frameworks with Inherent Structural Flexibility

2017 ◽  
Vol 70 (5) ◽  
pp. 566 ◽  
Author(s):  
Alexandre Burgun ◽  
Witold M. Bloch ◽  
Christian J. Doonan ◽  
Christopher J. Sumby
Keyword(s):  
Metal Organic Frameworks ◽  
Mixed Valence ◽  
Chemical Properties ◽  
Fine Tuning ◽  
Gate Opening ◽  
Sterically Demanding ◽  
Metal Organic ◽  
Structure Metrics ◽  
Physical And Chemical ◽  
And Chemical Properties

The chemical mutability of metal–organic frameworks (MOFs) is an advantageous feature that allows fine-tuning of their physical and chemical properties. Herein, we report the successful isoreticulation of a MOF with an outstanding gas selectivity for CO2 versus N2: [Cu(L1)(H2O)]·xS (CuL1), where H2L1 = bis(4-(4-carboxyphenyl)-1H-pyrazolyl)methane) and S = solvate. By modifying the steric bulk and length of the original ligand, we synthesised three new MOFs with 2D networks isoreticular to CuL1, namely [Cu(L1Me)(H2O)]·xS (CuL1Me), [Cu(L2)(H2O)]·xS (CuL2), and [Cu(L2Me)(H2O)]·xS (CuL2Me) (where H2L1Me = bis(4-(4-carboxyphenyl)-3,5-dimethyl-1H-pyrazolyl)methane, H2L2 = bis(4-(4-carboxyphenyl)-(ethyne-2,1-yl)-1H-pyrazolyl)methane, and H2L2Me = bis(4-(4-carboxyphenyl)-(ethyne-2,1-yl)-3,5-dimethyl-1H-pyrazolyl)methane). Depending on the steric hindrance and structure metrics of the organic links, staggered and eclipsed arrangements of 2D 44 net layers were obtained. The anisotropy of the pore dimensions is proportional to the linker length (L2 and L2Me), which when increased, renders these materials non-porous. However, the more sterically demanding ligand L1Me gives a material that shows gate-opening behaviour in response to a CO2 absorbate. The synthesis and structure of an unexpected mixed-valence CuII/CuI 3D MOF, Cu3[Cu(L2Me)2]2(H2O)4]·xS (Cu5(L2Me)4), containing an unusual trimeric CuII node are also reported.

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