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関連する概念動画

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.0K
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...
31.0K
Bonding in Metals02:32

Bonding in Metals

53.0K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
53.0K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.7K
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,...
48.7K
Metallic Solids02:37

Metallic Solids

21.0K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
21.0K
Ionic Crystal Structures02:42

Ionic Crystal Structures

18.1K
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...
18.1K
Alkali Metals03:06

Alkali Metals

25.0K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
25.0K

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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オーダーメイドのマクロ・マイクロポラス金属・オーガニック・フレームの単結晶

Kui Shen1, Lei Zhang1, Xiaodong Chen1

  • 1School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.

Science (New York, N.Y.)
|January 13, 2018
PubMed
まとめ
この要約は機械生成です。

研究者は,オーダーされたマクロとマイクロポーを持つ新しい単結晶金属有機フレームワーク (MOF) を作成しました. これらの階層的なMOFは,質量拡散が強化され,大容量の分子の優れた触媒につながります.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 化学工学

背景:

  • 従来の金属有機フレームワーク (MOF) は,しばしば階層的な孔構造を欠き,大量の分子を含む反応における効率を制限する.
  • 単結晶MOF内で秩序あるマクロおよびマイクロポリス性を達成することは,材料科学における重要な課題でした.

研究 の 目的:

  • MOF単一結晶内の高度に指向し,秩序付けられたマクロポールを構築するための方法を開発する.
  • 単一結晶の3次元オーダーされたマクロ-微孔質の材料の新しいクラスを作成します.
  • 大分子反応におけるこれらの新しい階層的なMOFの触媒性能を調査する.

主な方法:

  • 強力な形状効果を誘導するためにポリステルナノスフィアのモノリットのテンプレートを使用しました.
  • 制御されたMOF成長のために,二重溶媒誘導の異質な核化アプローチを使用した.
  • オーダーされた空隙の中でMOFのインシット成長を達成し,階層的な多孔性を持つ単一結晶を形成します.

主要な成果:

  • MOF単一結晶内で高度に指向された並べられたマクロポールを成功裏に構築した.
  • マクロとマイクロポーの両方の単結晶材料の形成 (階層的多孔性) を実証した.
  • 従来のZIF-8と比較して,階層的なMOFの質量拡散特性が大幅に改善された.

結論:

  • 開発された方法論は,ユニークな単結晶のマクロ-マイクロポラスMOFの合成を可能にします.
  • 階層的な毛穴構造と単結晶性により,大分子反応の優れた触媒活性と再利用性が得られます.
  • この研究は,触媒やその他の用途のための高度な多孔性の材料の設計に新しい道を開きます.