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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Bonding in Metals02:32

Bonding in Metals

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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”. 
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Metallic Solids02:37

Metallic Solids

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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....
20.7K
Alkali Metals03:06

Alkali Metals

24.8K
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
24.8K
Properties of Transition Metals02:58

Properties of Transition Metals

29.9K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.9K
Levels of Organization01:09

Levels of Organization

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Biological organization is the classification of biological structures, ranging from atoms at the bottom of the hierarchy to the Earth's biosphere. Each level of the hierarchy represents an increase in complexity that builds upon the previous level.
Molecules Are Composed of Atoms, and Biomolecules Are Assembled from Molecules:
The most basic levels include atoms, molecules, and biomolecules. Atoms, the smallest unit of ordinary matter, are composed of a nucleus and electrons. Molecules...
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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トレースCO2捕獲のためのバイオインスピレーションメタル・オーガニック・フレームワーク

Caitlin E Bien1, Kai K Chen2, Szu-Chia Chien3

  • 1Department of Chemistry and Biochemistry , The Ohio State University , Columbus , Ohio 43210 , United States.

Journal of the American Chemical Society
|September 27, 2018
PubMed
まとめ

この研究では,二酸化炭素 (CO2) を効率的に捕獲するために改造された新しい金属有機フレームワーク (MOF) が詳細に示されています. 亜鉛水酸化基を備えたこの材料は,温和な温度下でも優れたCO2の吸収と再生能力を有しています.

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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
  • 無機化学
  • ナノテクノロジー

背景:

  • メタル・オーガニック・フレームワーク (MOF) は,ガス捕獲のための調整可能な特性を提供します.
  • 炭酸水素酵素は,非常に効率的なCO2触媒である.
  • 効率的なCO2キャプチャ材料の開発は環境修復に不可欠です.

研究 の 目的:

  • 炭酸水素を模倣した活性部位を持つ新しいMOFを合成する
  • 微量の二酸化炭素 (CO2) を捕獲するためのMOFの性能を調査する.
  • 変更されたMOF内のCO2固定のメカニズムを探求する.

主な方法:

  • リガンド交換によるZnベンゾトリアゾラートMOFの合成後の改変.
  • 核愛性Zn-OH群を生成する熱活性化.
  • IRスペクトロスコーピーと密度関数理論 (DFT) の計算を用いた特徴付け.

主要な成果:

  • 改造されたMOF, [Zn(ZnOH) 4(bibta) 3が成功して合成されました.
  • MOFは微量のCO2を吸収するのに優れた性能を示した.
  • 温和な再生温度を達成した.
  • DFT計算とIRスペクトロスコピーは,Zn-OH/Zn-O2COHと水素結合を含むCO2固定メカニズムを明らかにした.

結論:

  • 合成後のMOFは,微量のCO2を吸収するのに高い効率を示しています.
  • 素材は温和な条件下で再生可能である.
  • 集束間の水素結合は,CO2の固定メカニズムで重要な役割を果たし,キャプチャの性能を向上させます.