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関連する概念動画

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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Network Covalent Solids02:18

Network Covalent Solids

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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,...
41.6K
Metallic Solids02:37

Metallic Solids

18.3K
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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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
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関連する実験動画

Updated: Jun 7, 2025

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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垂直に膨張した結晶孔状の共電性有機フレームワーク

Shuailei Xie1,2, Matthew A Addicoat3, Donglin Jiang1,2

  • 1Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City 350207, China.

Journal of the American Chemical Society
|November 15, 2024
PubMed
まとめ

研究者らは,協調結合を用いて,新しい垂直的に拡張された共性有機フレームワーク (COF) を作成した. これらの膨張したCOFは,以前アクセス不可能な空間を開き, 強化された分子相互作用とベンゼンとサイクロヘキサン混合物の効率的な分離を可能にします.

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Last Updated: Jun 7, 2025

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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科学分野:

  • 材料科学
  • 超分子化学
  • ナノテクノロジー

背景:

  • 配合性有機フレームワーク (COF) は,ゲストのアクセスを制限する π-π スタッキングにより,小さな層間距離 (3-6 Å) によって制限されます.
  • この閉じ込めは,COF層の延長された面との相互作用を妨げ,分子分離と閉じ込めの適用を制限します.
  • 現在のCOFは主にゲストの入出を z方向で許可し,x-y平面はアクセスできません.

研究 の 目的:

  • COFの層間距離を増やすための戦略を策定する.
  • 強化された分子相互作用のために COF の内部でアクセシブルなナノスペースを作成します.
  • ベンゼンやサイクロヘキサンなどの特定のゲスト分子のCOFの分離効率を向上させる.

主な方法:

  • トポロジー・ガイデッド・ポリメリゼーションによる2D共性コバルト (II) ポーフィリン層を合成した.
  • 縦に拡張されたCOFは,協調結合で結びついた二重軸柱を用いて組み立てられています.
  • フレームワークの性質と分離性能を分析するために蒸気吸収,画期的な実験,および計算的研究を活用した.

主要な成果:

  • 縦に拡張されたCOFは,π-πスタックを調整ボンドに置き換えることで成功しました.
  • 柱の長さで定義された離散のインターレイヤーを達成し,以前はアクセスできないインターレイヤーを開きます.
  • ベンゼンとサイクロヘクサンの混合物の効率的な分離が環境条件下で示されている.

結論:

  • 垂直に拡張されたCOFは,アクセシブルなインターレイヤを作成することによって,分子閉じ込めと分離のための新しいプラットフォームを提供します.
  • COFを拡張するために調整結合を使用する戦略は,暴露されたπ平面との超分子相互作用を可能にします.
  • ベンゼンとサイクロヘキサンなどの混合物を分離するための選択性を高めます.