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Metallic Solids02:37

Metallic Solids

18.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

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Metal Organic Framework Cubosomes.

Chen Li1,2, Yi Pan1, Tianyu Xiao1

  • 1School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.

Angewandte Chemie (International Ed. in English)
|January 17, 2023
PubMed
Summary
This summary is machine-generated.

Researchers created ordered metal-organic frameworks (MOFs) using polymer cubosomes as templates. These MOF cubosomes exhibit excellent catalytic activity as bioreactors, showcasing a novel MOF synthesis strategy.

Keywords:
Bicontinuous StructureBlock CopolymerCubosomeMetal Organic FrameworkProteolysis

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Ordered bicontinuous structures are crucial for advanced materials.
  • Metal-organic frameworks (MOFs) offer tunable properties for various applications.
  • Templating methods are essential for controlling MOF morphology and structure.

Purpose of the Study:

  • To develop a general strategy for synthesizing ordered bicontinuous MOFs.
  • To utilize polymer cubosomes (PCs) as templates for MOF synthesis.
  • To investigate the catalytic potential of the synthesized MOF cubosomes as bioreactors.

Main Methods:

  • Employing polymer cubosomes with Im m symmetry as templates.
  • Infiltrating MOF precursors into the PC channels.
  • Coordinating MOF precursors and removing the template to form MOF cubosomes.
  • Analyzing MOF formation kinetics using the Avrami equation.
  • Evaluating the catalytic activity of ZIF-8 cubosomes with trypsin enzyme.

Main Results:

  • Successfully synthesized MOF cubosomes with Pm m topology and 60-65 nm mesopore diameters.
  • Observed a novel MOF growth process involving seed formation, growth, and fusion.
  • Determined MOF growth kinetics following the Avrami equation with n=3 and k=1.33×10⁻⁴, indicating fast 3D heterogeneous growth.
  • Demonstrated high enzyme loading and catalytic activity of ZIF-8 cubosomes in proteolysis.

Conclusions:

  • A versatile strategy for creating ordered MOF cubosomes using PC templates was established.
  • The synthesized MOF cubosomes exhibit promising characteristics for bioreactor applications.
  • The study provides insights into MOF growth mechanisms and kinetics.