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Formation of Complex Ions03:45

Formation of Complex Ions

18.8K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

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Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...
1.6K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.7K
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...
1.7K
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

4.8K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
2.7K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.3K
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Updated: May 2, 2026

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

Published on: April 10, 2018

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過剰なカチオン変異 *CO 中間構成とCuの製品選択性 酸性電気化学 CO2還元反応

Suhwan Yoo1,2, Sejin Park1, Jihoon Son3

  • 1Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea.

Journal of the American Chemical Society
|April 2, 2025
PubMed
まとめ
この要約は機械生成です。

Cs+のような過剰なカチオンは,銅のCO吸収を変化させ,C2+製品よりも水素の進化を好むことにより,電気化学的CO2減少 (CO2RR) を妨げることができます. ポリマー結合剤はCO2RRの性能を回復する.

さらに関連する動画

Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

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関連する実験動画

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Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Published on: September 7, 2019

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科学分野:

  • 電気化学
  • 表面科学
  • カタリシス

背景:

  • 電気化学によるCO2削減 (CO2RR) は,持続可能な化学にとって極めて重要です.
  • カチオン濃度は,酸性環境におけるCO2RRの選択性に影響することが知られている.

研究 の 目的:

  • 過剰なカチオンがCO吸収構成とCO2RR製品の分布にどのように影響するかを調査する.
  • CO2RRの選択性におけるカチオン誘発による変化の背後にあるメカニズムを解明する.

主な方法:

  • CO吸収を監視するために,表面強化された弱体化された総反射率の赤外線吸収スペクトロスコーピー (ATR-SEIRAS) を使用する.
  • 密度関数理論 (DFT) のシミュレーションで,カチオン-COの相互作用を理解する.
  • カチオン濃度やポリマー結合物質の 電気化学実験

主要な成果:

  • Cs+濃度の増加は,Cu表面でのCO吸収を頂上からブリッジ構成にシフトさせます.
  • 高濃度のCs+は水素進化反応 (HER) を促進し,C−C結合を抑制する.
  • Cu表面のポリマー結合剤は,カチオン干渉を防止することによって,CO2RRの選択性を回復します.

結論:

  • カチオン濃度は,CO吸附中介物質とCO2RR経路に大きな影響を及ぼします.
  • Cs+によるCOブリッジの安定化は,C-C結合を阻害し,HERを好む.
  • ポリマー結合剤による触媒表面の改変は,有害なカチオン効果を軽減し,CO2RRを高める戦略を提供します.