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関連する概念動画

Network Covalent Solids02:18

Network Covalent Solids

13.3K
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...
13.3K
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

48.0K
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
48.0K
Metallic Solids02:37

Metallic Solids

18.2K
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....
18.2K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.5K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
9.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.1K
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...
26.1K
Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

48.7K
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
48.7K

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関連する実験動画

Updated: Jun 2, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

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混雑したノードからの相互接続された2D共性有機フレームワーク

Elisabet De Bolòs1, Saibal Bera1, Karol Strutyński2

  • 1POLYMAT, University of the Basque Country UPV/EHU, Avenida de Tolosa 72, Donostia-San Sebastián 20018, Spain.

Journal of the American Chemical Society
|January 13, 2025
PubMed
まとめ
この要約は機械生成です。

研究者は,ステリカルに阻害されたアロマティック・ビルディングブロックを使用して,相互に繋がった2Dの共性有機フレームワーク (COF) を作成する新しい方法を開発しました. このアプローチはπスタッキングを防止し,新しいCOFアーキテクチャを可能にします.

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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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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates

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関連する実験動画

Last Updated: Jun 2, 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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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

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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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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates

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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:

  • インターペネトレーションは3D共性有機フレームワーク (COF) に共通する特徴であるが,πスタッキングにより2DCOFでは稀である.
  • 既存の2D COFは,通常,垂直に配置されたアリル基を持つモノマーから派生する.

研究 の 目的:

  • ステリカルに過密化された多循環性アロマティック炭化水素を用いた新しい2D COFの合成について報告する.
  • 2D COFの構造と電子特性を研究する.

主な方法:

  • ステリックに過密された多環芳香炭化水素単体からCOFを合成する.
  • 顕微鏡,ガス吸収,光譜,および電荷輸送測定を用いた特徴付け.

主要な成果:

  • 2DCOFの合成に成功しました ステリックに混雑したアロマティックモノマーから
  • 相互接続したアーキテクチャにより,インターレイヤの π スタッキングがないことが示されました.
  • 特徴付けは,充電輸送を含むユニークな構造と特性を確認しました.

結論:

  • ステリカルに混雑したアロマティックシステムは,機械的に相互接続された2DCOFを生成するための効果的なモノマーです.
  • この戦略は,従来とは異なるトポロジーと特性を備えたCOFの設計に新たな可能性を秘めています.
  • これらの相互接続された2D COFに π スタッキングがないことは,新しいアプリケーションの道を開きます.