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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

21.6K
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...
21.6K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

699
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...
699
Ion Exchange01:17

Ion Exchange

676
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...
676
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

42.7K
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. 
42.7K
Structural Isomerism02:34

Structural Isomerism

19.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.8K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

1.1K
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...
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関連する実験動画

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Published on: December 29, 2016

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アニオン認識と検出のためのレドックス交換可能なカルコゲン結合

Robert Hein1, Andrew Docker1, Jason J Davis2

  • 1Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K.

Journal of the American Chemical Society
|May 6, 2022
PubMed
まとめ

カルコゲン結合 (ChB) の強度は,電気化学的に逆調節されます. このブレークスルーにより,新しいアニオンセンサーと分子スイッチが, ChBとリドックス活性分子との相互作用を制御することで可能になりました.

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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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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科学分野:

  • 超分子化学
  • 電気化学
  • 化学センサー

背景:

  • カルコゲン結合 (ChB) は,ハロゲン結合 (XB) に類似する強力な非共性相互作用である.
  • ChBドナーの強さを制御することは非常に重要ですが,アプリケーションには難しいです.
  • 電気化学的方法はダイナミックな制御のための有望な道を提供します.

研究 の 目的:

  • 電気化学的リドックス制御を用いた ChB 効能の可逆的大規模変調を証明する.
  • 調節可能な結合アフィニティを持つ新しいCHBベースのアニオンセンサを開発する.
  • 分子スイッチや機械における酸化還元調節されたCHBの可能性を調査する.

主な方法:

  • 新しいビス (フェロセニルテルロトリアゾール) とテルロビオロゲン受容体の合成.
  • サイクル電圧測定を用いた電気化学的特徴付け
  • 水性有機溶剤の混合物でのアニオン結合試験
  • レドックス・スイッチオン/オフアニオン認識の実証

主要な成果:

  • リバーシブルで大規模 (最大3桁の大きさ) の ChB強度が,レドックス制御によって達成された.
  • 最初の ChB媒介の電気化学アニオンセンサーを開発した.
  • アニオン結合誘発の電気化学反応が示され,いくつかのXBとHBセンサーを上回る.
  • レドックスセンターとCHBドナーサイトとの強い結合を示した.

結論:

  • 電気化学的還元制御は,CHBの相互作用を調節するための強力なツールを提供します.
  • レドックス調節されたCHBは,非常に敏感で調節可能なアニオンセンサーの開発を可能にします.
  • このアプローチは,高度な分子スイッチや機械を設計するための新しい可能性を開きます.