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関連する概念動画

Ion Exchange01:17

Ion Exchange

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 basic...
Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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.
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Structural Isomerism02:34

Structural Isomerism

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 be...

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関連する実験動画

Updated: Jun 11, 2026

Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange
04:51

Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange

Published on: June 23, 2023

ナノヘテロ構造 カチオン交換:アニオン系枠組保存

Prashant K Jain1, Lilac Amirav, Shaul Aloni

  • 1Department of Chemistry, University of California, Berkeley California 94720, USA.

Journal of the American Chemical Society
|July 3, 2010
PubMed
まとめ
この要約は機械生成です。

イオンナノ結晶は,イオン枠組を保存する過程であるカチオン交換を経験します. これにより,ナノ構造物の合成後の改造が可能になり,そのサイズ,形状,インターフェースが維持されます.

さらに関連する動画

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

Published on: February 23, 2017

関連する実験動画

Last Updated: Jun 11, 2026

Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange
04:51

Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange

Published on: June 23, 2023

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

Published on: February 23, 2017

科学分野:

  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー
  • 固体化学 固体化学

背景:

  • イオンナノ結晶は合成後,化学的に改造することができます.
  • カチオン交換は,ナノ結晶の組成を変化させながら,サイズと形状を保持することを可能にします.

研究 の 目的:

  • イオンナノ結晶のアニオン構造が,カチオン交換中に保存されていることを示す.
  • このアニオン系枠組の保全がナノヘテロ構造において維持されていることを示すために.
  • 複雑なナノ構造物の設計への影響を調査する.

主な方法:

  • イオンナノ結晶におけるイオン交換を調査した.
  • CdSe/CdSのナノヘテロ構造にカリオン交換を適用し,Cu2Se/Cu2Sの中間物質を介して交換する.
  • エクシトニクス機能,Zコントラストイメージング,エレメンタルラインスキャンを活用して,構造的,組成的変化を分析した.

主要な成果:

  • 離子交換がイオンナノ結晶のアニオン構造を保持することを確認しました.
  • ナノヘテロ構造における組成的インターフェースが,カチオン交換の過程で保たれていることを実証した.
  • 交換されたCdSe/CdSからPbSe/PbSナノ棒の種子サイズと位置の保存が観察されました.

結論:

  • アニオン枠組保存は,イオンナノ結晶のカチオン交換の重要な原則です.
  • この現象により,ナノヘテロ構造の正確な改変が可能になります.
  • それは,制御されたインターフェースを持つ複雑なナノマテリアルの設計の可能性を拡大します.