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関連する概念動画

Coordination Number and Geometry02:57

Coordination Number and Geometry

18.7K
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.
18.7K
Valence Bond Theory02:42

Valence Bond Theory

11.0K
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...
11.0K
Colors and Magnetism03:02

Colors and Magnetism

13.8K
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...
13.8K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.8K
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,...
47.8K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.3K
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...
30.3K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

23.7K
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...
23.7K

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関連する実験動画

Updated: Jan 6, 2026

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry

Published on: June 8, 2022

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六角形平面型移行金属複合体

Martí Garçon1, Clare Bakewell1, George A Sackman2,3

  • 1Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, UK.

Nature
|October 11, 2019
PubMed
まとめ
この要約は機械生成です。

研究者達が報告したのは 最初の六角形平面変形金属複合体です この新しい構造は,ハイドリドとマグネシウムのリガンドを備えたパラジウムで,従来の幾何学を超えて協調化学の可能性を広げています.

さらに関連する動画

Synthesis of a Water-soluble Metal&#8211;Organic Complex Array
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Synthesis of a Water-soluble Metal–Organic Complex Array

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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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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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関連する実験動画

Last Updated: Jan 6, 2026

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
16:11

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry

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Synthesis of a Water-soluble Metal&#8211;Organic Complex Array
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Synthesis of a Water-soluble Metal–Organic Complex Array

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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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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:

  • 協調化学
  • 無機化学
  • 材料科学

背景:

  • 移行金属複合体は,触媒,合成,および生物無機化学において不可欠である.
  • 確立された理解は,分子軌道理論を通じて複雑な形状と性質を結びつける.
  • 既知の6座標幾何学 (八面形,三角形のプリズマ) は限られており,六角形の平面形は稀であり,特定の相またはクラスターに限定されている.

研究 の 目的:

  • 六角平面幾何学を持つ単純な調整複合体を分離し,構造的に特徴づける.
  • トランジションメタルの複雑な幾何学に挑戦する.
  • 移行金属複合体の新しい設計原理を探求する.

主な方法:

  • 新しい移行金属複合体の合成と分離
  • 構造的特徴は,X線微分法または類似の技術を用いて決定する.
  • 結合と電子構造の分析

主要な成果:

  • 六角形の平面構造を持つ 移行金属複合体を合成し特徴付けました
  • 複合体は,3つの水素と3つのマグネシウムベースのリガンドに調整された中央のパラジウム原子を特徴としています.
  • これは,この幾何学を示す単純な調整複合体の最初の報告例を表しています.

結論:

  • 六角平面複合体の発見は,移行金属の既知の調整幾何学を拡張する.
  • この発見は 独特の特性を持つ 移行金属複合体の設計に 新たな道を開きます
  • 触媒,材料科学,その他の化学分野への潜在的な影響