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関連する概念動画

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.2K
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...
1.2K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

806
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...
806
Ion Exchange01:17

Ion Exchange

1.2K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.2K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

48.8K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
48.8K
Formation of Complex Ions03:45

Formation of Complex Ions

25.8K
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...
25.8K
Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

1.3K
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...
1.3K

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関連する実験動画

Updated: Jan 19, 2026

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
11:04

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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24+のcationicホスト内のcationicゲストである.

Jean-Pascal Bourgeois1, Makoto Fujita, Masaki Kawano

  • 1Department of Applied Chemistry, School of Engineering, The University of Tokyo, CREST, Japan Science and Technology Corporation (JST), 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Journal of the American Chemical Society
|August 2, 2003
PubMed
まとめ

研究者は,自己の陽性電荷により予想に反して,カチオンのゲストをカプセル化できる新しい調整ケージを作成しました. ホスト・ゲスト化学におけるこの画期的な発見は,イチゴのような構造を明らかにし,カチオン-カチオン相互作用を容易にしています.

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Spatiotemporally Controlled Nuclear Translocation of Guests in Living Cells Using Caged Molecular Glues as Photoactivatable Tags
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Spatiotemporally Controlled Nuclear Translocation of Guests in Living Cells Using Caged Molecular Glues as Photoactivatable Tags

Published on: January 17, 2019

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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
10:39

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

Published on: August 23, 2018

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関連する実験動画

Last Updated: Jan 19, 2026

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
11:04

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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Spatiotemporally Controlled Nuclear Translocation of Guests in Living Cells Using Caged Molecular Glues as Photoactivatable Tags
10:10

Spatiotemporally Controlled Nuclear Translocation of Guests in Living Cells Using Caged Molecular Glues as Photoactivatable Tags

Published on: January 17, 2019

11.3K
Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
10:39

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

Published on: August 23, 2018

8.3K

科学分野:

  • 超分子化学 超分子化学
  • 協調化化学について
  • マテリアルサイエンス 材料科学

背景:

  • 座標ケージは,宿主-ゲスト化学の潜在的応用を持つ超分子構造である.
  • ホスト・ゲスト・システム内の電荷相互作用を理解することは,新しい機能的材料の設計に不可欠です.

研究 の 目的:

  • ディピリミジンリガンドとパラジウムを使って新しい四面体協調ケージを合成する (II).
  • 新しく準備されたケージの宿主-ゲスト化学,特にカチオンのゲストを結合する能力を調査する.

主な方法:

  • 線形二ピリミジンリガンド (L) とシス保護パラジウム (II) (M) からM12L6調整ケージの合成.
  • 籠の結合能力を決定するホスト・ゲスト化学の研究.
  • 複雑な形成と相互作用を明らかにするための構造分析.

主要な成果:

  • 新しいM12L6四面体調整ケージの合成が成功しました.
  • このケージは,前例のないホスト・ゲストの化学反応を示し,非常にポジティブなフレームワーク・チャージ (+24) にもかかわらず,カチオンのゲストを収容した.
  • オニオンのような殻構造が特定され,対オニオンの経由でカチオン-カチオン相互作用を媒介する.

結論:

  • M12L6のケージはユニークなカチオン-カチオンホスト-ゲストの相互作用を示し,これまでの理解に挑戦しています.
  • 洋のような構造モチーフは,これらの珍しい複合体を安定させるための鍵です.
  • この研究は,チャージの相互作用を合わせた超分子システムを設計するための新しい道を開きます.