Investigation of the mechanism of metal–organic frameworks preventing polysulfide shuttling from the perspective of composition and structure

2020 ◽  
Vol 8 (14) ◽  
pp. 6661-6669 ◽  
Author(s):  
Jing Han ◽  
Shu Gao ◽  
Ruxing Wang ◽  
Kangli Wang ◽  
Mao Jiang ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Chemical Adsorption ◽  
Composition And Structure ◽  
Sieve Effect ◽  
Metal Organic ◽  
Composite Separator ◽  
Physical And Chemical

The inhibition of polysulfides by a MOF composite separator with an ion sieve effect, and physical and chemical adsorption is illustrated.

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 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.

Metal-Organic Framework (MOF)-Based Drug Delivery

2020 ◽  
Vol 27 (35) ◽  
pp. 5949-5969 ◽  
Author(s):  
Jian Cao ◽  
Xuejiao Li ◽  
Hongqi Tian
Keyword(s):  
Drug Delivery ◽  
Side Effects ◽  
Metal Organic Framework ◽  
Drug Loading ◽  
Metal Organic Frameworks ◽  
Research Area ◽  
Porous Solids ◽  
Future Perspectives ◽  
Composition And Structure ◽  
Metal Organic

Background: Developing a controllable drug delivery system is imperative and important to reduce side effects and enhance the therapeutic efficacy of drugs. Metal-organic frameworks (MOFs) an emerging class of hybrid porous materials built from metal ions or clusters bridged by organic linkers have attracted increasing attention in the recent years owing to the unique physical structures possessed, and the potential for vast applications. The superior properties of MOFs, such as well-defined pore aperture, tailorable composition and structure, tunable size, versatile functionality, high agent loading, and improved biocompatibility, have made them promising candidates as drug delivery hosts. MOFs for drug delivery is of great interest and many very promising results have been found, indicating that these porous solids exhibit several advantages over existing systems. Objective: This review highlights the latest advances in the synthesis, functionalization, and applications of MOFs in drug delivery, and has classified them using drug loading strategies. Finally, challenges and future perspectives in this research area are also outlined.

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.

scholarly journals Metal–organic frameworks (MOFs) based nanofiber architectures for the removal of heavy metal ions

RSC Advances ◽  
2022 ◽  
Vol 12 (3) ◽  
pp. 1433-1450
Author(s):  
Heja Ibrahim Adil ◽  
Mohammad R. Thalji ◽  
Suhad A. Yasin ◽  
Ibtisam A. Saeed ◽  
Mohammed A. Assiri ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Metal Organic Frameworks ◽  
Chemical Properties ◽  
High Specific Surface Area ◽  
High Porosity ◽  
Metal Organic ◽  
Physical And Chemical ◽  
And Chemical Properties

Metal–organic frameworks (MOFs) are promising and effective materials for removing heavy metal ions from contaminated water owing to their high porosity, remarkable physical and chemical properties, and high specific surface area.

Metal–organic frameworks and their derivatives as electrocatalysts for the oxygen evolution reaction

2021 ◽  
Author(s):  
Jian Du ◽  
Fei Li ◽  
Licheng Sun
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Recent Progress ◽  
Metal Organic Frameworks ◽  
Composition And Structure ◽  
Metal Organic

This review summarizes the recent progress on MOFs and their derivatives used for OER electrocatalysis in terms of their morphology, composition and structure–performance relationship.

Deposition of Metal Clusters into the Functionalized Metal Organic Frameworks

2012 ◽  
Vol 496 ◽  
pp. 230-234
Author(s):  
Ying Gu ◽  
Yuan Shuai Zhu ◽  
Bao Li ◽  
Wu Lin Chen
Keyword(s):  
Density Functional Theory ◽  
First Principles ◽  
Density Functional ◽  
Metal Clusters ◽  
Metal Cluster ◽  
Metal Organic Frameworks ◽  
Density Functional Theory Calculations ◽  
Chemical Adsorption ◽  
Functional Theory ◽  
Metal Organic

Utilizing first-principles density functional theory calculations, we identify that weak adhesion of metal clusters (for example Cu and Au) on pristine MOF-5, IRMOF-3, IRMOF-3-OH and IRMOF-3-SH, which reveals that metal clusters may be unable to stably exist in the pore of MOFs. Furthermore, upon removing the hydrogen of NH2, SH and OH functional groups, the adsorption energy between metal cluster and functionalized MOFs improve, which ascribes to chemical adsorption. Meanwhile, these metal clusters become cationic as a result of the formation of metal-O, S or N adhesion bonds. Hence, our study may provide a candidate approach to deposit metal clusters into the pore of MOFs.

Structural and Electronic Modulation of Conductive MOFs for Efficient Oxygen Evolution Reaction Electrocatalysis

2021 ◽  
Author(s):  
Jiawen Li ◽  
Peng Liu ◽  
Jianxin Mao ◽  
Jianyue Yan ◽  
Wenbo Song
Keyword(s):  
Heterogeneous Catalysis ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Metal Organic Frameworks ◽  
Structure Activity ◽  
Composition And Structure ◽  
Metal Organic

Conductive metal-organic frameworks (MOFs) have been developed as a superior platform for heterogeneous catalysis. Particularly, the tunable composition and structure of conductive MOFs provides an opportunity to probe the structure-activity...

scholarly journals Metal Organic Frameworks (MOFs) as efficient carrier for targeted nanodrug delivery

2020 ◽  
pp. 1-10
Author(s):  
Ravi Karki ◽  
Dipak Adhikari ◽  
Kapil Adhikari ◽  
Nurapati Pantha
Keyword(s):  
Drug Delivery ◽  
Targeted Drug Delivery ◽  
System Development ◽  
Drug Loading ◽  
Metal Organic Frameworks ◽  
Porous Solids ◽  
Nanodrug Delivery ◽  
Composition And Structure ◽  
Wide Range ◽  
Metal Organic

A controllable and targeted drug delivery system development is imperative and important to reduce side effects and enhance the therapeutic efficacy of drugs. Metal-organic frameworks (MOFs), an emerging type of hybrid porous materials synthesized from metal ions or clusters abridged by organic linkers. They have attracted increasing attention in the recent years owing to the unique physical structures possessed, and the potential for wide range of applications. The superior properties of MOFs, such as well-defined pore aperture, tailorable composition and structure, tunable size, versatile functionality, high agent loading, and improved biocompatibility, have made them promising candidates as drug delivery hosts. MOFs for drug encapsulation and delivery is of great interest and many very promising results have been found, indicating that these porous solids exhibit several advantages over existing systems. This review highlights the recent advances in the synthesis, functionalization, and applications of MOFs in nanodrug delivery, and has classified them using drug loading strategies.

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