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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

45.1K
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,...
45.1K
Carbon Skeletons01:12

Carbon Skeletons

111.1K
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...
111.1K
Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
15.7K
Ionic Crystal Structures02:42

Ionic Crystal Structures

15.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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関連する実験動画

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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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二次元共性有機フレームワークの集積構造

Chengjun Kang1, Zhaoqiang Zhang1, Adam K Usadi2

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585, Singapore.

Journal of the American Chemical Society
|February 14, 2022
PubMed
まとめ

2D 協和有機フレームワーク (COF) で結晶相を定量化することは困難です. この研究では,これまで検出されなかったオフセットスタッキングを含むCOFの詳細な集積構造を明らかにするために,13C固体核磁気共振 (13C SSNMR) を使用しています.

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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
  • 固体化学
  • 超分子化学

背景:

  • コバレンティック・オーガニック・フレームワーク (COF) は,多様な結晶構造を示し,幅広い用途を可能にします.
  • 多結晶2DCOF粉末の結晶相を定量化することは依然として大きな課題です.
  • 2D COFの集積構造を理解することは,その性能を最適化するために極めて重要です.

研究 の 目的:

  • 2次元共性有機フレームワーク (COF) の集積構造を調査する.
  • 13C固体核磁共振 (13C SSNMR) のCOF集積の特徴化における有用性を調査する.
  • COFの特性に対する様々な積み重ねの仕様とその影響を区別する.

主な方法:

  • 固体核磁気共鳴法 (13C SSNMR) を利用した.
  • 乾燥状態とソルバット状態の両方で4つの異なる2DCOFサンプルを分析した.
  • 異なるCOF層のスタッキング構成で相関するスペクトル変化.

主要な成果:

  • 13C SSNMRが2D COFの異なる集合構造を効果的に区別できることを実証した.
  • 他のアグリゲーションタイプと量的に異なるAAスタッキング.
  • 2D COFで以前に報告されていないオフセットスタッキング構造が特定され,X線方法では検出できません.
  • 乾燥したCOFと溶解したCOFの区別された構造を観察した.

結論:

  • 13C SSNMRは2D COFの集積構造を定量的に分析するための強力なツールです.
  • この研究は,短距離のオーダーオフセット構造を含むCOFのスタッキングに関する新しい洞察を示しています.
  • 発見は2D COF構造の理解を深め,改善された材料設計とアプリケーションの道を開きます.