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関連する概念動画

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

46.4K
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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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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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...
15.6K
VSEPR Theory02:37

VSEPR Theory

12.6K
Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

10.8K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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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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トポロジーを持つ3次元共性有機フレームワーク

Zonglong Li1, Li Sheng1, Hangchao Wang1

  • 1Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.

Journal of the American Chemical Society
|December 17, 2020
PubMed
まとめ

研究者は,新しいトポロジー (ceq) を備えた3D共性有機フレームワーク (3D-COF) を開発した. この多孔な材料は,CO2,CH4,およびH2の効率的なガス吸収を示し,3D-COFのアプリケーションを拡大します.

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科学分野:

  • 材料科学
  • 化学について

背景:

  • 三次元共性有機フレームワーク (3D-COF) は,調節可能な構造を持つ高度な多孔性材料です.
  • 既存の3D-COFトポロジーは,3Dビルディングユニットとボンドの可逆性の設計における課題のために制限されています.

研究 の 目的:

  • これまでに報告されていないトポロジーで新しい3D-COFを導入します.
  • 新しい3D-COFの構造特性とガス吸収特性を探求する.

主な方法:

  • 3D-COFの合成は,D3対称の三角形のプリズム頂点と平面の三角形のリンク器を使用する.
  • BET分析のようなテクニックを用いてCOFの構造と表面積の特徴づけ.
  • CO2,CH4,H2の吸収を評価するためのガス吸収測定

主要な成果:

  • "ceq"トポロジーを持つ新しい3D-COFが成功裏に合成されました.
  • この材料は,高Brunauer-Emmett-Teller表面積の1148.6m2g−1の2倍相互浸透した構造を示した.
  • 3D-ceq-COFはCO2,CH4,H2の効率的な吸収を示した.

結論:

  • この研究は,多様な3D-COFを作成するための新しいビルディングユニットと合成戦略を提示します.
  • 新しい"ceq"トポロジーは,3D-COFの構造的可能性を拡大します.
  • 効率的なガス吸収能力は,この新しい材料の潜在的なアプリケーションを強調します.