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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.6K
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...
1.6K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.7K
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...
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...
1.3K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

25.9K
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...
25.9K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

994
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...
994
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

4.1K
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...
4.1K

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Updated: Apr 16, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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Published on: August 7, 2018

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ポリオキソメタラートとサイクロデキストリンを複合する.

Yilei Wu1, Rufei Shi1,2, Yi-Lin Wu1

  • 1†Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States.

Journal of the American Chemical Society
|March 11, 2015
PubMed
まとめ

この研究は,サイクロデクストリン (CD) 内におけるポリオキソメタラート (POM) の予期せぬ複合性を実証し,安定した有機-無機混合材料を形成しています. これらのPOM-CD複合体は,独特の構造と溶液中の保存された酸化還元特性を示し,POM機能化の道を開きます.

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Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

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Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance
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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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科学分野:

  • 超分子化学 超分子化学
  • マテリアルサイエンス 材料科学
  • 無機化学 無機化学とは

背景:

  • 水性宿主内の水性好客の複合は,典型的には困難です.
  • ポリオキソメタラート (POM) は,多様な用途を持つ多用途の無機クラスターです.
  • サイクロデクストリン (CD) は,超分子化学において確立された宿主分子である.

研究 の 目的:

  • ポリオキソメタラート ([PMo12O40](3-)) とガンマ・ベータ・サイクロデクストリン (CDs) の複合性を調査する.
  • 結果となる有機-無機混合複合体の構造と性質を特徴付ける.
  • POMsの機能化のためのホスト・ゲスト化学の可能性を調査する.

主な方法:

  • 2:1サイクロデクストリン-POM複合体の合成 ([La(H2O) 9{[PMo12O40][γ-CD]2}と[La(H2O) 9{[PMo12O40][β-CD]2}).
  • シングルクリスタルX線 difraktionを用いた構造分析.
  • NMRスペクトロスコピー,X線散射,質量スペクトロメトリーによる溶液行動調査.
  • レドックス特性を評価するための電気化学的研究.

主要な成果:

  • 固体状態で2つの安定した2:1有機-無機混合複合体の形成.
  • 単結晶X線 difraktionは,C-H··OMoの相互作用によって2つのCDに封じ込められたPOMとサンドイッチのような構造を明らかにしました.
  • 複合体は,O-H··O相互作用によって固体状態で1D柱状の超構造を形成する.
  • ナノコンフィネメント効果と水溶液中のゆっくりとした色変化の証拠.
  • 封装されたPOMは溶液中の酸化還元性特性をほとんど保持しています.

結論:

  • ヒドロフィリックPOMのヒドロホビックCD内の成功複合が実証され,以前の仮定に異議を唱えた.
  • 超分子互補性は,機能化の可能性のある明確に定義されたハイブリッド材料の形成を可能にします.
  • ホスト・ゲスト・ケミストリーは,POMの特性およびアプリケーションを変更するための穏やかなアプローチを提供します.