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関連する概念動画

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 - 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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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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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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Organic Compounds

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All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
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Noncovalent Attractions in Biomolecules02:35

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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.
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Updated: Dec 12, 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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エステル結合結晶共性有機フレームワーク

Chenfei Zhao1, Hao Lyu1, Zhe Ji1

  • 1Department of Chemistry, Kavli Energy Nanoscience Institute, and Berkeley Global Science Institute, University of California-Berkeley, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|August 14, 2020
PubMed
まとめ
この要約は機械生成です。

研究者はエステル結合を用いて結晶性,多孔性共性有機フレームワーク (COF) を合成した. この画期的な発見は 網状化学を拡張し 毛穴のある用途に 新しい材料を提供しました

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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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科学分野:

  • 材料科学
  • 有機化学
  • クリスタルグラフィー

背景:

  • 協和有機フレームワーク (COF) は,結晶性多孔ポリマーである.
  • 既存のCOFはしばしばエステル以外の結合を用いる.
  • 大規模で秩序ある構造をCOFで実現することは大きな課題です.

研究 の 目的:

  • 新しいエステル結合結晶共性有機フレームワーク (COF) の合成と特徴づけ
  • COFの合成のためのトランスエステル化反応の可能性を調査する.
  • 網状化学の範囲をエステル結合COFに拡大する.

主な方法:

  • ディトピク-2-ピリジニル芳香カルボキシラートとトライまたはテトラトピクフェノール間のトランスエステル化反応.
  • エステル結合COFの結晶化
  • X線微分と表面積解析を用いた構造的特徴付け

主要な成果:

  • エステル結合の結晶性多孔性COF (COF-119からCOF-122まで) の成功合成
  • COFは2092 m2/gまでの高表面積で kgmとhcbのトポロジーで得られた.
  • COF-122は,金属-有機フレームワークに匹敵する,拡張された結晶のエッジを示した.

結論:

  • この研究は,結晶エステル結合COFの最初の合成を示しています.
  • この発見は,網状化学の原理の適用範囲を広げている.
  • 開発されたCOFは構造的に一般的なポリエステルと関連しており,新しい材料設計の道を開いています.