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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

9.4K
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...
9.4K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

659
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...
659
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

21.5K
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...
21.5K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

471
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
471
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

27.6K
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...
27.6K
Coordination Number and Geometry02:57

Coordination Number and Geometry

16.6K
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.
16.6K

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関連する実験動画

Updated: Sep 10, 2025

In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films
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In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

Published on: January 17, 2017

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三座標金におけるアオロフィリック相互作用 ((I) C-クランプのような構造を持つ複合体

Sarah Costa1, Alan L Balch1

  • 1Contribution from the Department of Chemistry, University of California, Davis, California 95616, United States.

ACS omega
|August 25, 2025
PubMed
まとめ

橋渡しディホスフィンの新しい金 (I) コンプレックスが合成された. これらの化合物は独特のc-クランプ構造とオーロフィリック相互作用を示しますが,典型的な2座標の金複合体とは異なる発光性を表しません.

科学分野:

  • 無機化学
  • 協調化学
  • 材料科学

背景:

  • 金 ((I) コンプレックスにおけるアオロフィリック相互作用は,しばしば光を引き起こす.
  • 3座標の金 ((I) 複合体は2座標の複合体と比較して探査が少ない.
  • ブリッジング・ディフォスフィンは,多核金複合体を構築するための重要なリガンドである.

研究 の 目的:

  • 新しい三座標金複合体を合成し,特徴づけること.
  • これらの複合体の構造的および光物理的性質を調査する.
  • オーロフィルの相互作用を媒介するブリッジング・ディフォスフィンの役割を探求する.

主な方法:

  • ブリッジング・ディフォスフィン (bis- ((diphenylphosphino) -メタンまたは1,2-bis- ((diphenylphosphino) -エタン) とゴールド ((I) 前駆物質を含むワンポット合成.
  • 標的複合体の単結晶を得るための結晶化.
  • 分子構造と金-金結合の長さを決定するX線微分分析.
  • 室温と低温 (90K) での光発光スペクトル検査

主要な成果:

  • 2つの新しい金 ((I) 複合体の合成: (μ-dppm) - ({Au-bipy) }2) - (PF6) 2と (μ-dppe) - ({Au-bipy) }2) - (BF4) 2.

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Au-Interaction of Slp1 Polymers and Monolayer from Lysinibacillus sphaericus JG-B53 - QCM-D, ICP-MS and AFM as Tools for Biomolecule-metal Studies
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Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of GoldIII
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Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of GoldIII

Published on: August 31, 2018

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関連する実験動画

Last Updated: Sep 10, 2025

In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films
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Au-Interaction of Slp1 Polymers and Monolayer from Lysinibacillus sphaericus JG-B53 - QCM-D, ICP-MS and AFM as Tools for Biomolecule-metal Studies
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Au-Interaction of Slp1 Polymers and Monolayer from Lysinibacillus sphaericus JG-B53 - QCM-D, ICP-MS and AFM as Tools for Biomolecule-metal Studies

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Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of GoldIII
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Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of GoldIII

Published on: August 31, 2018

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  • 複合体は,有意なオーロフィル相互作用 (Au-Au距離3.0903(6) Åおよび3.249(1) Åのc-クランプのような構造を特徴としています.
  • 両方とも,類似のゴールド (I) システムに対する期待に反して,室温または90 Kで複雑な発光を示さなかった.

    • 結論:

    • ブリッジング・ディフォスフィンは,オーロフィルの相互作用を持つ3座標のゴールド (I) センターを効果的に安定させることができる.
    • 観測されたc-クランプ構造と非発光性の性質は,これらの3座標の金複合体のユニークな性質を強調しています.
    • 発光性の欠如は,特定の調整環境とブリッジリングリガンドが光物理的行動に影響することを示唆する.