Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.5K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

446
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...
446
Colors and Magnetism03:02

Colors and Magnetism

11.7K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.7K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.5K
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,...
42.5K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

514
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...
514
Formation of Complex Ions03:45

Formation of Complex Ions

23.6K
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...
23.6K

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

The Relationship between Systemic Immune Inflammatory Index, Prognostic Nutritional Index, and Postoperative Infection in Patients Undergoing Partial Hepatectomy for Liver Cancer.

Iranian journal of allergy, asthma, and immunology·2026
Same author

Scalable ampere-level CO<sub>2</sub> electroreduction to ethylene enabled by descriptor-guided oxygen affinity engineering.

Nature communications·2026
Same author

A drug‑spiked blood meal provides substantial female elimination as a pretreatment step for mosquito sex separation in the sterile insect technique.

Journal of medical entomology·2026
Same author

Diamond Formation at Superlubric Sliding Interface.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

Ultra-High Contact Electrified Current Generation and Chemical Sensing at IL-Based Immiscible Liquid-Liquid Interface.

Micromachines·2026
Same author

Effect of Mindfulness Training on the Clinical Pregnancy Rate in Women Undergoing Frozen Embryo Transfer: Study Protocol for a Single-Center, Open-Label, Randomized Controlled Trial.

International journal of women's health·2026

関連する実験動画

Updated: Jul 1, 2025

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

9.2K

ダイナミック・コッパー・サイト 再分散 ゼオライト・デフェクトにおける原子トラッピング

Stephen C Purdy1, Gregory Collinge2, Junyan Zhang1

  • 1Manufacturing Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States.

Journal of the American Chemical Society
|March 11, 2024
PubMed
まとめ

ゼオライト基の銅触媒は,単純な高温空気処理を使用してシンタリング後に再生することができます. この酸化再生プロセスは,酸化銅の集積を単一部位に効果的に分散させ,触媒の安定性と再利用性を高めます.

さらに関連する動画

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
07:24

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

Published on: May 10, 2021

6.0K
Resource Recycling of Red Soil to Synthesize Fe2O3/FAU-type Zeolite Composite Material for Heavy Metal Removal
05:52

Resource Recycling of Red Soil to Synthesize Fe2O3/FAU-type Zeolite Composite Material for Heavy Metal Removal

Published on: June 2, 2022

2.9K

関連する実験動画

Last Updated: Jul 1, 2025

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

9.2K
Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
07:24

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

Published on: May 10, 2021

6.0K
Resource Recycling of Red Soil to Synthesize Fe2O3/FAU-type Zeolite Composite Material for Heavy Metal Removal
05:52

Resource Recycling of Red Soil to Synthesize Fe2O3/FAU-type Zeolite Composite Material for Heavy Metal Removal

Published on: June 2, 2022

2.9K

科学分野:

  • 異質な触媒
  • 材料科学
  • ナノテクノロジー

背景:

  • シングルサイト銅触媒は高い活性と選択性を提供しますが,高温の低温環境でのシンタリングによる無効化に苦しんでいます.
  • 逆戻りできない構造の変化は これらの貴重な触媒の長期的使用を制限します

研究 の 目的:

  • ゼオライトベースの単一サイト銅触媒の再生戦略を策定する.
  • 様々な条件下で銅の動的構造と酸化状態の変化を調査する.
  • ゼオライトのフレームワーク内の銅の再分散と安定化のメカニズムを理解する.

主な方法:

  • ゼオライトベースの銅触媒 (Cu-Zn-Y/deAlBeta) の合成
  • 反応と加速老化の条件下での触媒試験
  • 再生のための550 °Cの空気中の酸化処理.
  • イメージング,インシトスペクトロスコピー,および触媒速度測定を用いた特徴付け.
  • アブ・イニシオ分子動力学シミュレーション

主要な成果:

  • 反応後に形成された酸化銅の集積物は,酸化処理によって単一の部位に再分散されました.
  • シングルサイト銅は酸化状態 (Cu2+からCu1+からCu0) と構造のダイナミックな変化を示した.
  • ゼオライトシラノールの巣は,再生後の単一場所の銅を閉じ込め,安定させるための重要な場所として特定されました.
  • 再生はZnとYプロモーターの存在と欠如において効果的であった.

結論:

  • 空気中の550°Cでの単純な酸化再生戦略は,シンタリング後の単一サイト銅触媒を復元することができます.
  • ゼオライトシラノールの巣は,酸化条件下で銅単位の安定化に重要な役割を果たします.
  • このアプローチにより,単一場所の銅触媒の耐久性と適用性が著しく向上します.