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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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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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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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Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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関連する実験動画

Updated: Jul 11, 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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同型二孔二次元共性有機フレームワーク

Boxu Feng1, Xiyu Chen2, Pu Yan3

  • 1The Soft2D Lab, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Journal of the American Chemical Society
|November 16, 2023
PubMed
まとめ

研究者は,カゴーム (kgm) トポロジーで新しい二次元 (2D) 協和有機フレームワーク (COF) を合成した. アズレン基のCOFは,記録的な低帯域のギャップとNO2ガスの検出における優れた性能を示しています.

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Last Updated: Jul 11, 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
  • 化学について
  • ナノテクノロジー

背景:

  • 階層的な多孔性を持つ二次元 (2D) の共性有機フレームワーク (COF) は有望な材料である.
  • カゴーム (kgm) トポロジーの2DCOFは,ユニークな光電子特性を提供しているが,合成することは困難である.
  • 平方格子トポロジーの競争は,kgmのCOF合成を妨げています.

研究 の 目的:

  • kgmトポロジーで二孔二次元COFを合成するための新しい幾何学的戦略を開発する.
  • これらのCOFの構造-性質の相関を調査し,特に同位体構成要素の効果に焦点を当てます.
  • これらのCOFをガスセンシングアプリケーションの電極材料として活用する可能性を調査する.

主な方法:

  • ナフタリアン基とアズレーン基の4つ腕の同位体単体を使用する新しい幾何学的な戦略を使用した.
  • kgmトポロジーで2つの同位体二孔2DCOFを合成した.
  • COFを特徴付け,NO2検出用のガスセンサーの電極材料としてアズレン基COF (COF-Az) を評価した.

主要な成果:

  • kgmトポロジーで2つの同位体二孔2DCOFを成功して合成した.
  • アズレン基COF (COF-Az) は狭い帯域のギャップ1. 37 eVを示し,報告されたイミン結合二次孔COFの中で最も低い.
  • COF- AzはNO2に対する高い選択性を示し,58. 7%の応答率 (10ppmNO2),迅速な回復 (72秒),10週間の安定性,そして80%の湿度耐性を示した.

結論:

  • この新しい幾何学的戦略は,2DのCOFの合成を可能にする.
  • アズレンの大きな二極モーメントは,イミン結合の感度を大幅に高め,ガスセンサーの性能を向上させます.
  • アズレン基の2DCOFは,構造-特性関係を研究し,先進的なガスセンサーを開発するための有望なプラットフォームを提供します.