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関連する概念動画

Formation of Complex Ions03:45

Formation of Complex Ions

24.8K
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...
24.8K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

852
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...
852
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

623
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
623
Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

1.1K
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...
1.1K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

1.6K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
1.6K
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

2.6K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
2.6K

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関連する実験動画

Updated: Nov 14, 2025

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry

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低価カルシウムでのダイナトゲン複合と還元

B Rösch1, T X Gentner1, J Langer1

  • 1Inorganic Chemistry, University Erlangen-Nürnberg, 91058 Erlangen, Germany.

Science (New York, N.Y.)
|March 12, 2021
PubMed
まとめ
この要約は機械生成です。

研究者は,亜窒素 (N2) 大気下で低価カルシウム (I) 複合体を調査した. 彼らは新しい複合体であるLCa(N2) CaLを分離し,望ましいカルシウム(I) 化合物の前駆体として使用しました.

さらに関連する動画

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

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Submillisecond Conformational Changes in Proteins Resolved by Photothermal Beam Deflection
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Submillisecond Conformational Changes in Proteins Resolved by Photothermal Beam Deflection

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関連する実験動画

Last Updated: Nov 14, 2025

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry

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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

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Submillisecond Conformational Changes in Proteins Resolved by Photothermal Beam Deflection
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Submillisecond Conformational Changes in Proteins Resolved by Photothermal Beam Deflection

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科学分野:

  • 無機化学
  • 有機金属化学
  • 材料科学

背景:

  • 低値主群の金属複合体は,そのユニークな反応性のために重要な関心を持っています.
  • 金属複合体による二酸化窒素 (N2) の活性化は,窒素固定に意味を持つ化学における重要な課題である.
  • 大容量のリガンドは,反応性のある低価金属の中心を安定させるためにしばしば使用されます.

研究 の 目的:

  • 低価カルシウム (I) 複合体を合成し,特徴づけること.
  • 二酸化窒素 (N2) とカルシウムとの反応性を調べる.
  • これらの複合体を他の低価カルシウム種のためのシントンとして探求する.

主な方法:

  • 二酸化窒素 (N2) の下で低価カルシウム (LCa-CaL) 複合体の合成を試みた.
  • 孤立した二酸化窒素複合体の結晶学的な特徴.
  • 調整された二酸化窒素アニオンの反応性の調査 (N2^2-).

主要な成果:

  • LCa ((N2) CaLの分離と結晶学的特徴づけ
  • ダイナトロゲン (N2^2-) アニオンは強力な2電子ドナー能力を示した.
  • LCa(N2) CaLは,目標の低価カルシウム ((I) コンプレックス,LCa-CaLのシントンとして識別された.
  • N2^2-アニオンのプロトネーションは,不均衡なダイアゼン (N2H2) を導いた.

結論:

  • LCa(N2) CaLは安定した複合体であり,低価カルシウム ((I) 化学の有価シントンとして機能する.
  • 調整された二酸化窒素アニオンは,強力な電子ドナーとして作用し,陽子化を受け,多用途の反応性を示す.
  • この研究は,二酸化窒素活性化におけるカルシウムd軌道の役割についての洞察を提供します.