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関連する概念動画

Network Covalent Solids02:18

Network Covalent Solids

13.4K
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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Newman Projections02:06

Newman Projections

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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.8K
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...
2.8K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.0K
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,...
42.0K
Carbon Skeletons01:12

Carbon Skeletons

107.6K
Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
107.6K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.3K
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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関連する実験動画

Updated: Jun 21, 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

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五角形の孔を持つ二次元共性有機フレームワーク

Fuxiang Wen1, Kai Xu1, Yaoqian Feng1

  • 1State Key Laboratory of Silicon and Advanced Semiconductor Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, China.

Journal of the American Chemical Society
|July 9, 2024
PubMed
まとめ
この要約は機械生成です。

研究者らは,MCMのトポロジック構造を持つ新しい五角形の共価有機フレームワーク (COF) を開発した. これらの頑丈で多孔な材料は酸素還元反応を高効率で触媒化し,先進的な応用の道を開いています.

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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: Jun 21, 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

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior
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Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 化学について

背景:

  • 二次元共性有機フレームワーク (2D COF) は,孔の形によって制限され,分離および触媒のアプリケーションを阻害します.
  • 五角形の孔を持つ2D COFを構成することは,重要な合成課題です.
  • 既存の多角孔型COFは,高度な触媒プロセスの限界を完全に解決していない.

研究 の 目的:

  • 五角形の孔構造を持つ新しい2DCOFを設計し合成する.
  • 酸素還元反応におけるこれらの新しい五角形COFの触媒活性を調査する.
  • 独特の孔の幾何学を持つ機能的な2D COFを作成するための実行可能な戦略を確立する.

主な方法:

  • C4とC2の対称なブロックを用いた合理的な設計.
  • mcm トポロジカル構造を持つ2D COFの合成
  • 結晶性,多孔性,強さの特徴
  • 酸素還元反応 (ORR) の電気触媒試験

主要な成果:

  • 五角形の毛穴とMKトポロジーを持つ最初の2DCOFを成功裏に合成しました.
  • その結果,五角形のCOFは高結晶性,優れた多孔性,および堅固な安定性を示した.
  • 組み込みのポルフィリンユニットは 酸素還元反応の効率的な電気触媒を可能にしました
  • ORRで0.81Vの高い半波電位を達成し,主要なCOFベースの電気触媒と競合する.

結論:

  • 五角形の孔を持つ2D COFの構築の実現可能性を示した.
  • 機能的な五角形COFを作成するための新しい合成戦略を開発しました.
  • 先進的な電解応用,特にORRにおけるこれらの材料の可能性を強調した.