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関連する概念動画

Network Covalent Solids02:18

Network Covalent Solids

15.8K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

29.8K
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...
29.8K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.5K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

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Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
10.9K
MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

13.2K
The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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3DケージCOF:高接続性の有機ケージノードを持つダイナミック3次元共性有機フレームワーク

Qiang Zhu1, Xue Wang1,2, Rob Clowes1

  • 1Department of Chemistry and Materials Innovation Factory, University of Liverpool, Liverpool L7 3NY, United Kingdom.

Journal of the American Chemical Society
|September 7, 2020
PubMed
まとめ

研究者らは,新しい有機ケージビルディングブロックを使用して,最初のケージベースの3D共性有機フレームワーク (COF) 3D-CageCOF-1を開発しました. このダイナミックな素材は 炭素吸収と水吸収の 可能性を示しています

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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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科学分野:

  • 材料科学
  • 超分子化学
  • ナノテクノロジー

背景:

  • 3次元 (3D) の共性有機フレームワーク (COF) は,複数の反応部位を持つ限られた多面体構成要素のために合成することが困難である.
  • 複雑な3D COFアーキテクチャを構築するためのノードとして有機ケージは有望な代替案です.

研究 の 目的:

  • 三角プリズム有機ケージノードを使用して最初のケージベースの3DCOFを合成する.
  • 構造的トポロジー,ダイナミックな行動,結果のCOFの機能的性質を調査する.

主な方法:

  • 三角プリズマノードとしての有機ケージ分子 (ケージ-6-NH2) の合成.
  • 合成されたケージ分子を用いて3DCOF (3D-CageCOF-1) の構築.
  • COFのトポロジー,孔構造,ダイナミック・スイッチングの特性

主要な成果:

  • 3D-CageCOF-1の最初のケージベースの3DCOFの合成に成功しました.
  • COFは前代未聞の2倍に交互に浸透したACSのトポロジーを示しています.
  • 小孔 (sp) と大孔 (lp) の構造の間の可逆的な切り替えが示され,低湿度で高CO2吸収と水吸収が示されています.

結論:

  • 3D COFの構造的多様性を拡大するために,有機ケージは建築ユニットとして効果的に利用できます.
  • 3D-CageCOF-1は,ガス分離と水収集のアプリケーションに重要な可能性を秘めています.
  • この研究は 複雑で機能的な多孔性材料の設計に 新たな道を開きます