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関連する概念動画

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.1K
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...
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Organic Compounds03:02

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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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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Molecular Models02:00

Molecular Models

41.1K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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What is Organic Chemistry?02:17

What is Organic Chemistry?

81.5K
Organic chemistry is the study of compounds of carbon called organic compounds. Organic compounds either originate from living organisms or are synthesized by chemists. A defining trait of these compounds is the presence of carbon as the principal element, which is bonded to other carbon atoms and other elements such as hydrogen, oxygen, nitrogen, and sulfur. The existence of a wide array of organic molecules is a consequence of carbon atoms’ ability to form up to four strong bonds to...
81.5K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

45.0K
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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Updated: Sep 27, 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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再構築された共性有機枠組

Weiwei Zhang1, Linjiang Chen1,2, Sheng Dai1

  • 1Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, China.

Nature
|April 7, 2022
PubMed
まとめ
この要約は機械生成です。

研究者らは,フレームワークの再構築を使用して高結晶性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. この技術は,COFの安定性と多孔性を高め,光触媒などのアプリケーションでの性能を改善します.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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関連する実験動画

Last Updated: Sep 27, 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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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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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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科学分野:

  • 材料科学
  • 有機化学
  • ナノテクノロジー

背景:

  • 配合性有機フレームワーク (COF) は調節性特性を有しますが,フレーム形成反応の逆転性が低いため,高い結晶性および安定性を達成することは困難です.
  • リバーシブル化学を用いた既存の方法は,安定性が損なわれ,応用が限られているCOFを生成する.
  • 頑丈で高結晶のCOFは,特に触媒とエネルギー変換における高度なアプリケーションに望ましい.

研究 の 目的:

  • 堅固で高結晶のイミンCOFを合成するための一般的でスケーラブルなプロトコルを開発する.
  • COFの特性を高めるための新しいフレームワークの再構築戦略を調査する.
  • 光触媒の応用における再構築されたCOFの性能の向上を実証する.

主な方法:

  • リバーシブルコヴァレンントテザーを用いたモノメアの前編成を含む新しい合成プロトコル.
  • フレームワークの再構築を達成するためにモノメアの前組織化後の限定ポリメリゼーション.
  • COF製剤の真空合成方法について

主要な成果:

  • フレームワークの再構築経路で堅固で高結晶のイミンCOFを成功裏に準備しました.
  • 標準的な方法と比較して,再構築されたCOFの結晶性および多孔性を大幅に改善しました.
  • 再構築されたCOFで電荷キャリアの輸送が改善され,高光触媒水素進化率 (最大27.98 mmol h−1 g−1) が示された.

結論:

  • ナノコンフィネメントによる再構築戦略は,高品質のCOFを生産するための一般的でスケーラブルな方法を提供します.
  • 再構築されたCOFの結晶性および多孔性は,光触媒の水素進化において優れた性能をもたらします.
  • このアプローチは,有機物質の構造と機能の正確な制御に向けた重要なステップです.