Super Strong and Tough Polybenzimidazole/Metal Ions Coordination Networks: Reinforcing Mechanism, Recyclability, and Anti‐Counterfeiting Applications

2021 ◽  
pp. 2100643
Author(s):  
Tianmeng Liu ◽  
Hong Huang ◽  
Yan Wang ◽  
Junrong Yu ◽  
Zuming Hu
Keyword(s):  
Metal Ions ◽  
Coordination Networks

scholarly journals Spiers Memorial Lecture: Coordination Networks that Switch between Nonporous and Porous Structures: An Emerging Class of Soft Porous Crystals

2021 ◽  
Author(s):  
Michael Zaworotko ◽  
Shi-Qiang Wang ◽  
Soumya Mukherjee
Keyword(s):  
Metal Ions ◽  
Memorial Lecture ◽  
Crystalline Solids ◽  
Porous Structures ◽  
Coordination Networks

Coordination networks (CNs) are a class of (usually) crystalline solids typically comprised of metal ions or cluster nodes linked into 2 or 3 dimensions by organic and/or inorganic linker ligands....

scholarly journals Metal-organic magnets with large coercivity and ordering temperatures up to 242°C

Science ◽  
2020 ◽  
Vol 370 (6516) ◽  
pp. 587-592 ◽  
Author(s):  
Panagiota Perlepe ◽  
Itziar Oyarzabal ◽  
Aaron Mailman ◽  
Morgane Yquel ◽  
Mikhail Platunov ◽  
...  
Keyword(s):  
Metal Ions ◽  
Room Temperature ◽  
Building Blocks ◽  
Inorganic Materials ◽  
Coordination Networks ◽  
Critical Temperatures ◽  
Considerable Success ◽  
Organic Magnets ◽  
Metal Organic ◽  
Constituent Elements

Magnets derived from inorganic materials (e.g., oxides, rare-earth–based, and intermetallic compounds) are key components of modern technological applications. Despite considerable success in a broad range of applications, these inorganic magnets suffer several drawbacks, including energetically expensive fabrication, limited availability of certain constituent elements, high density, and poor scope for chemical tunability. A promising design strategy for next-generation magnets relies on the versatile coordination chemistry of abundant metal ions and inexpensive organic ligands. Following this approach, we report the general, simple, and efficient synthesis of lightweight, molecule-based magnets by postsynthetic reduction of preassembled coordination networks that incorporate chromium metal ions and pyrazine building blocks. The resulting metal-organic ferrimagnets feature critical temperatures up to 242°C and a 7500-oersted room-temperature coercivity.

scholarly journals Atomically Precise Crystalline Materials Based on Kinetically Inert Metal Ions via Reticular Mechanopolymerization

2020 ◽  
Author(s):  
Wen-Yang Gao ◽  
Aishanee Sur ◽  
Chen-Hao Wang ◽  
Gregory R. Lorzing ◽  
Alexandra M. Antonio ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Metal Ions ◽  
Coordination Polymers ◽  
Solid Solutions ◽  
Mechanochemical Synthesis ◽  
Rational Approach ◽  
Structural Elements ◽  
Coordination Networks ◽  
Crystalline Materials ◽  
Metal Materials

The incorporation of kinetically inert metal ions as structural elements in crystalline coordination polymers is a synthetic challenge. While a small family of materials based on inert ions has been prepared (<i>i.e.</i> Cr(III)-based MIL-100, MIL-101, and [Ru<sub>6</sub>(btc)<sub>4</sub>Cl<sub>3</sub>]), general strategies that enable reticular synthesis have not been reported. Here we describe the mechanochemical synthesis of a reticular family of crystalline Ru<sub>2</sub>[II,III]-based materials by polymerization of molecular Ru<sub>2</sub> complexes, featuring unprotected carboxylic acid substituents, with Cu(OAc)<sub>2</sub>. The resulting crystalline heterobimetallic MOFs are solid-solutions of Ru<sub>2</sub> and Cu<sub>2</sub> sites housed within [M<sub>3</sub>L<sub>2</sub>] phases. The developed mechanochemical strategy is modular and allows for control of the primary coordination sphere of the Ru<sub>2</sub> sites. We anticipate the strategy will provide a rational approach to incorporation of kinetically inert ions in porous crystalline coordination networks, generating a class of atomically precise mixed-metal materials.

Multi-colour uranyl emission efficiently tuned by hexacyanidometallates within hybrid coordination frameworks

2019 ◽  
Vol 55 (21) ◽  
pp. 3057-3060 ◽  
Author(s):  
Szymon Chorazy ◽  
Jakub J. Zakrzewski ◽  
Mateusz Reczyński ◽  
Barbara Sieklucka
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Coordination Networks ◽  
Hybrid Coordination ◽  
Coordination Frameworks

Hexacyanidometallates of transition metal ions govern the topology and the photoluminescence of bimetallic d–f hybrid coordination networks incorporating uranyl cations.

Crystal structures, topologies and luminescent properties of three Zn(ii)/Cd(ii) coordination networks based on naphthalene-2,6-dicarboxylic acid and different bis(imidazole) linkers

RSC Advances ◽  
2015 ◽  
Vol 5 (21) ◽  
pp. 16190-16198 ◽  
Author(s):  
Zhi-Hao Yan ◽  
Wen Wang ◽  
Liangliang Zhang ◽  
Xiaowei Zhang ◽  
Lei Wang ◽  
...  
Keyword(s):  
Metal Ions ◽  
Dicarboxylic Acid ◽  
Crystal Structures ◽  
Coordination Polymers ◽  
Structural Diversity ◽  
Luminescent Properties ◽  
Coordination Networks ◽  
Bridging Ligands

Three new coordination polymers (CPs) based on H2ndc acid have been synthesized and structurally characterized. Three CPs exhibit structural diversity depending on different bis(imidazole) bridging ligands and center metal ions.

Tuning the packing, interpenetration, and porosity of two-dimensional networks by metal ions and ligand side groups

2020 ◽  
Vol 7 (18) ◽  
pp. 3424-3430
Author(s):  
Xiao-Yun Tian ◽  
Hao-Long Zhou ◽  
Xue-Wen Zhang ◽  
Chao Wang ◽  
Dong-Dong Zhou ◽  
...  
Keyword(s):  
Metal Ions ◽  
Carboxylate Ligand ◽  
Two Dimensional ◽  
Coordination Networks

A methyl-modified bent pyridyl-carboxylate ligand reacts with three metal ions to yield three sql coordination networks, showing different packing and interpenetration modes and porosities.

scholarly journals Atomically Precise Crystalline Materials Based on Kinetically Inert Metal Ions via Reticular Mechanopolymerization

2020 ◽  
Author(s):  
Wen-Yang Gao ◽  
Aishanee Sur ◽  
Chen-Hao Wang ◽  
Gregory R. Lorzing ◽  
Alexandra M. Antonio ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Metal Ions ◽  
Coordination Polymers ◽  
Solid Solutions ◽  
Mechanochemical Synthesis ◽  
Rational Approach ◽  
Structural Elements ◽  
Coordination Networks ◽  
Crystalline Materials ◽  
Metal Materials

The incorporation of kinetically inert metal ions as structural elements in crystalline coordination polymers is a synthetic challenge. While a small family of materials based on inert ions has been prepared (<i>i.e.</i> Cr(III)-based MIL-100, MIL-101, and [Ru<sub>6</sub>(btc)<sub>4</sub>Cl<sub>3</sub>]), general strategies that enable reticular synthesis have not been reported. Here we describe the mechanochemical synthesis of a reticular family of crystalline Ru<sub>2</sub>[II,III]-based materials by polymerization of molecular Ru<sub>2</sub> complexes, featuring unprotected carboxylic acid substituents, with Cu(OAc)<sub>2</sub>. The resulting crystalline heterobimetallic MOFs are solid-solutions of Ru<sub>2</sub> and Cu<sub>2</sub> sites housed within [M<sub>3</sub>L<sub>2</sub>] phases. The developed mechanochemical strategy is modular and allows for control of the primary coordination sphere of the Ru<sub>2</sub> sites. We anticipate the strategy will provide a rational approach to incorporation of kinetically inert ions in porous crystalline coordination networks, generating a class of atomically precise mixed-metal materials.

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

ELNES of Iron Compounds

1990 ◽  
Vol 48 (2) ◽  
pp. 28-29
Author(s):  
Hiroki Kurata ◽  
Kazuhiro Nagai ◽  
Seiji Isoda ◽  
Takashi Kobayashi
Keyword(s):  
Energy Loss ◽  
Metal Ions ◽  
Energy Resolution ◽  
Transition Metal Oxides ◽  
Local Symmetry ◽  
Iron Compounds ◽  
Fine Structures ◽  
Electron Energy Loss ◽  
Fe Ions ◽  
Electron Energy Loss Spectra

Electron energy loss spectra of transition metal oxides, which show various fine structures in inner shell edges, have been extensively studied. These structures and their positions are related to the oxidation state of metal ions. In this sence an influence of anions coordinated with the metal ions is very interesting. In the present work, we have investigated the energy loss near-edge structures (ELNES) of some iron compounds, i.e. oxides, chlorides, fluorides and potassium cyanides. In these compounds, Fe ions (Fe2+ or Fe3+) are octahedrally surrounded by six ligand anions and this means that the local symmetry around each iron is almost isotropic.EELS spectra were obtained using a JEM-2000FX with a Gatan Model-666 PEELS. The energy resolution was about leV which was mainly due to the energy spread of LaB6 -filament. The threshole energies of each edges were measured using a voltage scan module which was calibrated by setting the Ni L3 peak in NiO to an energy value of 853 eV.

Sign in / Sign up

Export Citation Format

Share Document