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関連する概念動画

Network Covalent Solids02:18

Network Covalent Solids

12.9K
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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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...
3.5K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.5K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.5K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

3.3K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
3.3K
Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

55.1K
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.
55.1K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.5K
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...
28.5K

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関連する実験動画

Updated: May 6, 2026

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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アジンと結合した共性有機構造体である.

Sasanka Dalapati1, Shangbin Jin, Jia Gao

  • 1Department of Materials Molecular Science, Institute for Molecular Science, National Institutes of Natural Sciences , 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Japan.

Journal of the American Chemical Society
|November 5, 2013
PubMed
まとめ

ピレン列を備えた新しい共性有機フレームワーク (COF) は,高い発光度と多孔性を示しています. これらのアジン関連COFは,2,4,6-トリニトロフェノールなどの爆発物を検出する際の特別な感度と選択性を示しています.

さらに関連する動画

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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関連する実験動画

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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科学分野:

  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー
  • 有機化学 オーガニック・ケミストリー

背景:

  • 協和有機フレームワーク (COF) は,調節可能な構造を持つ結晶性多孔ポリマーである.
  • ピレネ基の材料は,ユニークな光物理的特性で知られています.
  • センサーアプリケーションのための堅牢で機能的なCOFの開発は,依然として重要な課題です.

研究 の 目的:

  • ピレンの構成要素を使用して,新しい二次元共性有機フレームワーク (COF) を合成する.
  • 結果となるアジン結合COFの構造,多孔性,光物理的性質を調査する.
  • 化学感知アプリケーション,特に爆発物の検出のためのCOFのパフォーマンスを評価する.

主な方法:

  • ヒドラジンと1,3,6,8-テトラキス (((4-ホルミルフェニル) ピレンを溶熱凝縮する.
  • 結晶性および構造の決定のためのX線微分を用いた特徴化.
  • 表面積と多孔性を決定するためのガス吸附測定.
  • 光発光スペクトロスコピーは,光発光特性を評価する.
  • 2,4,6-トリニトロフェノール. の選択的検出のためのケモセンシング実験.

主要な成果:

  • 高度結晶の二次元アジン結合COFが成功して合成されました.
  • フレームワークは,ピレン柱の周期的な順序と1次元微孔のチャネルを展示しています.
  • COFは永続的な多孔性,高い表面積,そして優れた化学的安定性を有しています.
  • ピレンの柱状の順序は,強い発光につながります.
  • アジン単位は,水素結合相互作用の有効な部位として作用する.
  • COFは2,4,6-トリニトロフェノール (爆発物) の検出に高い感度と選択性を示した.

結論:

  • 開発されたアジン結合ピレンCOFは,先進的な材料のための有望なプラットフォームを提供します.
  • 独特の構造,発光,多孔性は,非常に敏感で選択的な化学感知を可能にします.
  • この戦略は,さまざまな用途のための多様な機能的な材料を作成するために拡張できます.