Rational Design of 2D Magnetic Metal−Organic Coordination Polymers Assembled from Oxalato and Dipyridyl Spacers

2006 ◽  
Vol 6 (8) ◽  
pp. 1839-1847 ◽  
Author(s):  
Urko García-Couceiro ◽  
Oscar Castillo ◽  
Antonio Luque ◽  
Juan P. García-Terán ◽  
Garikoitz Beobide ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Rational Design ◽  
Magnetic Metal ◽  
Metal Organic

Syntheses, structures and characterization of isomorphous CoII and NiII coordination polymers based on 2-[(1H-imidazol-1-yl)methyl]-6-methyl-1H-benzimidazole and benzene-1,4-dicarboxylate

2017 ◽  
Vol 73 (8) ◽  
pp. 645-651 ◽  
Author(s):  
Qiu-Ying Huang ◽  
Yang Zhao ◽  
Xiang-Ru Meng
Keyword(s):  
Coordination Polymers ◽  
Rational Design ◽  
Three Dimensional ◽  
Spectroscopic Properties ◽  
Polymeric Chain ◽  
Design And Synthesis ◽  
Carboxylate Groups ◽  
Metal Organic ◽  
The One ◽  
Ir Spectroscopic

Careful choice of the organic ligands is one of the most important parameters in the rational design and synthesis of coordination polymers. Aromatic polycarboxylates have been widely used in the preparation of metal–organic polymers since they can utilize various coordination modes to form diverse structures and can act as hydrogen-bond acceptors and donors in the assembly of supramolecular structures. Nitrogen-heterocyclic organic compounds have also been used extensively as ligands for the construction of polymers with interesting structures. In the polymers catena-poly[[[diaquabis{2-[(1H-imidazol-1-yl)methyl]-6-methyl-1H-benzimidazole-κN 3}cobalt(II)]-μ2-benzene-1,4-dicarboxylato-κ2 O 1:O 4] dihydrate], {[Co(C8H4O4)(C12H11N4)2(H2O)2]·2H2O} n , (I), and catena-poly[[[diaquabis{2-[(1H-imidazol-1-yl)methyl]-6-methyl-1H-benzimidazole-κN 3}nickel(II)]-μ2-benzene-1,4-dicarboxylato-κ2 O 1:O 4] dihydrate], {[Ni(C8H4O4)(C12H11N4)2(H2O)2]·2H2O} n , (II), the CoII or NiII ion lies on an inversion centre and exhibits a slightly distorted octahedral coordination geometry, coordinated by two N atoms from two imidazole rings and four O atoms from two monodentate carboxylate groups and two water molecules. The dicarboxylate ligands bridge metal ions forming a polymeric chain. The 2-[(1H-imidazol-1-yl)methyl]-6-methyl-1H-benzimidazole ligands coordinate to the CoII or NiII centres in monodentate modes through an imidazole N atom and are pendant on opposite sides of the main chain. The two structures are isomorphous. In the crystal, the one-dimensional chains are further connected through O—H...O, O—H...N and N—H...O hydrogen bonds, leading to a three-dimensional supramolecular architecture. In addition, the IR spectroscopic properties, PXRD patterns, thermogravimetric behaviours and fluorescence properties of both polymers have been investigated.

scholarly journals Probing magnetic interactions in metal–organic frameworks and coordination polymers microscopically

2018 ◽  
Vol 47 (38) ◽  
pp. 13257-13280 ◽  
Author(s):  
Paul J. Saines ◽  
Nicholas C. Bristowe
Keyword(s):  
Coordination Polymers ◽  
Metal Organic Frameworks ◽  
Atomic Scale ◽  
Magnetic Interactions ◽  
Magnetic Metal ◽  
Metal Organic

This perspective paper highlights the insights obtained through experimental and computational probes of magnetic metal–organic frameworks at the atomic scale.

Construction of CuII Cluster-Based Magnetic Metal–Organic Framework Derived from a V-Shaped Aromatic Dicarboxylate Ligand

2015 ◽  
Vol 68 (3) ◽  
pp. 416 ◽  
Author(s):  
Yong-Qiang Chen ◽  
Yuan Tian ◽  
Jun Li
Keyword(s):  
Rational Design ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Magnetic Metal ◽  
Metal Organic ◽  
Coordination Framework ◽  
Systematic Synthesis

In our efforts towards rational design and systematic synthesis of cluster-based metal–organic frameworks, a new CuII coordination framework derived from the V-shaped aromatic dicarboxylate with formula [Cu4(µ4-O)(L)3]∞ (1), H2L = (4-phenyl)-2,6-bis(4-carboxyphenyl)pyridine) was synthesised under hydrothermal conditions and structurally characterised by single-crystal X-ray diffraction, powder X-ray diffraction, elemental analysis, and infrared spectroscopy. Structure analysis shows that complex 1 has a three-dimensional framework based on [Cu8] cluster with 8-connected bcu topology. Magnetic investigation suggests that anti-ferromagnetic coupling exists between CuII ions in the [Cu8] cluster.

Metal-organic Nanopharmaceuticals

2020 ◽  
Vol 8 (3) ◽  
pp. 163-190
Author(s):  
Benjamin Steinborn ◽  
Ulrich Lächelt
Keyword(s):  
Metal Ions ◽  
Coordination Polymers ◽  
Active Agent ◽  
Lewis Base ◽  
High Loading ◽  
Active Components ◽  
Base Functions ◽  
Metal Organic ◽  
Theranostic Applications ◽  
Pharmacologically Active

: Coordinative interactions between multivalent metal ions and drug derivatives with Lewis base functions give rise to nanoscale coordination polymers (NCPs) as delivery systems. As the pharmacologically active agent constitutes a main building block of the nanomaterial, the resulting drug loadings are typically very high. By additionally selecting metal ions with favorable pharmacological or physicochemical properties, the obtained NCPs are predominantly composed of active components which serve individual purposes, such as pharmacotherapy, photosensitization, multimodal imaging, chemodynamic therapy or radiosensitization. By this approach, the assembly of drug molecules into NCPs modulates pharmacokinetics, combines pharmacological drug action with specific characteristics of metal components and provides a strategy to generate tailorable multifunctional nanoparticles. This article reviews different applications and recent examples of such highly functional nanopharmaceuticals with a high ‘material economy’. : Lay Summary: Nanoparticles, that are small enough to circulate in the bloodstream and can carry cargo molecules, such as drugs, imaging or contrast agents, are attractive materials for pharmaceutical applications. A high loading capacity is a generally aspired parameter of nanopharmaceuticals to minimize patient exposure to unnecessary nanomaterial. Pharmaceutical agents containing Lewis base functions in their molecular structure can directly be assembled into metal-organic nanopharmaceuticals by coordinative interaction with metal ions. Such coordination polymers generally feature extraordinarily high loading capacities and the flexibility to encapsulate different agents for a simultaneous delivery in combination therapy or ‘theranostic’ applications.

Single crystal to single crystal transformation of spin-crossover coordination polymers from 3D frameworks to 2D layers

2021 ◽  
Vol 9 (15) ◽  
pp. 5082-5087
Author(s):  
Yu Gong ◽  
Wang-Kang Han ◽  
Hui-Shu Lu ◽  
Qing-Tao Hu ◽  
Huan Tu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Crystal ◽  
Coordination Polymers ◽  
Ligand Exchange ◽  
Spin Crossover ◽  
Metal Organic Frameworks ◽  
Crystal Transformation ◽  
Metal Organic

New Hofmann-type metal–organic frameworks display rare and complete ligand exchange induced single crystal to single crystal transformations from 3D frameworks to 2D layers, accompanied by magnetic properties transition from two-step SCO behavior to hysteretic SCO behavior.

Design and synthesis of a new magnetic metal organic framework as a versatile platform for immobilization of acidic catalysts and CO2 fixation reaction

2021 ◽  
Author(s):  
Faezeh Taghavi ◽  
Amir Khojastehnezhad ◽  
Reza Khalifeh ◽  
Maryam Rajabzadeh ◽  
Fahimeh Rezaei ◽  
...  
Keyword(s):  
Co2 Fixation ◽  
Metal Organic Framework ◽  
Environmentally Friendly ◽  
Chemical Fixation ◽  
Design And Synthesis ◽  
Acidic Catalysts ◽  
Magnetic Metal ◽  
Metal Organic ◽  
Fixation Reaction ◽  
Organic Framework

The first report of the use of an acidic magnetic metal organic framework for the chemical fixation of CO2 as an environmentally friendly reaction.

scholarly journals Enhancement of Thermostability of Aspergillus flavus Urate Oxidase by Immobilization on the Ni-Based Magnetic Metal–Organic Framework

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1759
Author(s):  
Neda Motamedi ◽  
Mahmood Barani ◽  
Azadeh Lohrasbi-Nejad ◽  
Mojtaba Mortazavi ◽  
Ali Riahi-Medvar ◽  
...  
Keyword(s):  
Aspergillus Flavus ◽  
Metal Organic Framework ◽  
Urate Oxidase ◽  
Significant Activity ◽  
Original Activity ◽  
Long Term Stability ◽  
Magnetic Metal ◽  
Metal Organic ◽  
Almost All ◽  
Organic Framework

The improvement in the enzyme activity of Aspergillus flavus urate oxidase (Uox) was attained by immobilizing it on the surface of a Ni-based magnetic metal–organic framework (NimMOF) nanomaterial; physicochemical properties of NimMOF and its application as an enzyme stabilizing support were evaluated, which revealed a significant improvement in its stability upon immobilization on NimMOF (Uox@NimMOF). It was affirmed that while the free Uox enzyme lost almost all of its activity at ~40–45 °C, the immobilized Uox@NimMOF retained around 60% of its original activity, even retaining significant activity at 70 °C. The activation energy (Ea) of the enzyme was calculated to be ~58.81 kJ mol−1 after stabilization, which is approximately half of the naked Uox enzyme. Furthermore, the external spectroscopy showed that the MOF nanomaterials can be coated by hydrophobic areas of the Uox enzyme, and the immobilized enzyme was active over a broad range of pH and temperatures, which bodes well for the thermal and long-term stability of the immobilized Uox on NimMOF.

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