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関連する概念動画

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

21.1K
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...
21.1K
Valence Bond Theory02:42

Valence Bond Theory

8.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.8K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.9K
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...
26.9K
Coordination Number and Geometry02:57

Coordination Number and Geometry

16.2K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
16.2K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

570
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
570
Colors and Magnetism03:02

Colors and Magnetism

12.0K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.0K

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関連する実験動画

Updated: Jul 26, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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ダイナミック・メタル・リガンド・コーディネーション・ブースト CO2 電子還元

Xiangdong Kong1, Jiankang Zhao1, Zifan Xu1

  • 1Hefei National Research Center for Physical Sciences at the Microscale, CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.

Journal of the American Chemical Society
|June 14, 2023
PubMed
まとめ

二酸化炭素を一酸化炭素に変換する ダイナミックな銀の触媒を開発しました この突破は静的な触媒の限界を克服し 高効率のCO2変換を可能にします

さらに関連する動画

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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関連する実験動画

Last Updated: Jul 26, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Published on: April 10, 2018

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
08:40

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

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科学分野:

  • 材料科学
  • 電気化学
  • キャタリシス

背景:

  • 異質な触媒の性能は,静的活性部位とアドソルバートの線形スケーリング関係によって制限されます.
  • 効率的な二酸化炭素 (CO2ER) を一酸化炭素 (CO) に変換することは,持続可能な化学にとって極めて重要です.

研究 の 目的:

  • ダイナミックで反転可能なインターフェイス構造を異質な触媒で設計する.
  • CO2の電還元を強化するために,アドソーバートの線形スケーリング関係を克服する.

主な方法:

  • トリアゾール改変銀結晶 (Ag結晶-トリアゾール) の合成
  • インターフェイス構造を分析するための表面科学測定.
  • 反応メカニズムを理解するための理論的な計算 (例えば,DFT).
  • 二酸化炭素の電気還元のための電気化学試験

主要な成果:

  • アドソーブされたトリアゾールとトリアゾリルの間の動的変換は,金属-リガンド結合によってAg{111}で実証された.
  • CO に対して98%のファラダイク効率と,CO に対して−802.5 mA cm−2の部分電流密度を達成した.
  • CO2 プロトネーションバリアを減らし,速度決定のステップを変更するダイナミックな金属-リガンドの調整を示した.

結論:

  • ダイナミックなインターフェイス構造を持つAg結晶トリアゾールは,アドソルバートの線形スケーリング関係を効果的に断ち切ります.
  • このアプローチは,高度な異質な触媒を設計するための新しい戦略を提供します.
  • 効率的なCO2削減のためのインターフェイスエンジニアリングに関する原子レベルの洞察を提供します.