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.

TiO2-pillared clays with well-ordered porous structure and excellent photocatalytic activity

RSC Advances ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 8210-8215 ◽  
Author(s):  
Jae-Hun Yang ◽  
Huiyan Piao ◽  
Ajayan Vinu ◽  
Ahmed A. Elzatahry ◽  
Seung-Min Paek ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Metal Ions ◽  
Porous Structure ◽  
Divalent Metal ◽  
Pillared Clays ◽  
Porous Structures ◽  
Divalent Metal Ions ◽  
Octahedral Sites ◽  
Excellent Photocatalytic Activity ◽  
Ordered Porous

TiO2-pillared clays with well-ordered porous structures are successfully prepared via incorporating TiO2 nanosol particles into the clays, where empty octahedral sites are partially modified with divalent metal ions such as Mg2+ and Fe2+.

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.

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