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関連する概念動画

Formation of Complex Ions03:45

Formation of Complex Ions

18.8K
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...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Structural Isomerism02:34

Structural Isomerism

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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,...
16.8K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.5K
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...
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Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
6.7K
Coordination Number and Geometry02:57

Coordination Number and Geometry

15.5K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
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(二酸化窒素) 三銅 (III) 複合体の分離

Leslie J Murray1, Walter W Weare, Jason Shearer

  • 1Department of Chemistry, Center for Catalysis, University of Florida , Gainesville, Florida 32611, United States.

Journal of the American Chemical Society
|September 20, 2014
PubMed
まとめ
この要約は機械生成です。

研究者らは,ブリッジング・ダイナトロゲン・リガンドを含むトリコッパー (((I)) 複合体を合成した. 顕微鏡および計算分析により,金属-二酸化窒素のバックボンドが最小限に示され,ユニークな電子相互作用が示唆されました.

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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A Study of the Complexation of MercuryII with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry
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A Study of the Complexation of MercuryII with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry
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科学分野:

  • 無機化学 無機化学とは
  • 有機金属化学 有機金属化学
  • 協調化化学について

背景:

  • トリス (((β-ディケチミン) サイクロファンは,協調化学における多用途リガンドである.
  • 二酸化窒素 (N2) リガンドは,その惰性性により,合成および研究が困難である.
  • N2リガンドを含む銅複合体は,触媒的な応用の可能性を秘めている.

研究 の 目的:

  • 新しいトリコッパー (((I) 複合体とブリッジング・ディナイトロゲン・リガンドを合成し,特徴づけること.
  • 銅と二酸化窒素リガンドの電子構造と結合相互作用を調査する.
  • 計算的方法を使用して金属-二酸化窒素のバックボンドの性質を探求する.

主な方法:

  • トリコッパー (((I) コンプレックスからトリス (((β-ディケチミン)) サイクロファンの前駆体から合成.
  • ラーマン光譜法 (rRaman) と窒素-15核磁気共振 ((15) N NMR) 光譜法を用いた特徴付け.
  • 密度関数理論 (DFT) 計算と分子内の原子の量子理論 (QTAIM) 分析.

主要な成果:

  • 橋渡しダイナトロゲンリガンドとトリコッパー (((I) コンプレックスが成功して合成されました.
  • 顕微鏡データ (rRaman νN-N = 1952 cm(-1), (15) NMR δ = 303.8 ppm) は,二酸化窒素リガンドの存在を確認した.
  • DFTとQTAIMの分析では,金属-二酸化窒素のバックボンドが最小で,N2 (p2π*) とCu (dπ) /Cu (dσ) 軌道からの貢献は限られていることが示された.

結論:

  • この研究では,独特のトリコッパー ((I) -ディナイトロゲン複合体の形成が報告されています.
  • 電子構造は,典型的な結合シナリオとは異なる弱い金属-二酸化窒素相互作用を明らかにします.
  • この発見は,移行金属と二酸化窒素の協調化学の理解に貢献します.