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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Lewis Acids and Bases02:33

Lewis Acids and Bases

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In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
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Lewis Acids and Bases02:16

Lewis Acids and Bases

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This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
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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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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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相关实验视频

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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
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通过中性,易斯酸复合物的协调

Jeremy C Mullins1, Matthew J Evans1, Joseph M Parr1

  • 1School of Chemistry, Monash University, P.O. Box 23, Melbourne, Victoria 3800, Australia.

Journal of the American Chemical Society
|December 8, 2025
PubMed
概括
此摘要是机器生成的。

这项研究合成了新型二氧化复合物,形成第一个2组金属/TMS复合物. 这些复合体表现出弱但显著的结合,其中静电相互作用占主导地位.

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科学领域:

  • 有机金属化学
  • 主要组化学
  • 协调化学

背景情况:

  • 合成了具有约束几何形状的酸二氧化物.
  • 通过X射线结晶学检测出具有分子间协调性的二维结构.

研究的目的:

  • 合成和描述第一个2组金属/TMS复合物.
  • 调查这些新型复合体中的结合相互作用.

主要方法:

  • 合成二氧化复合物
  • 用X射线和中子衍射进行结构测定.
  • 密度函数理论 (DFT) 的计算,包括ETS-NOCV和NBO分析.
  • 非共价相互作用 (NCI) 和分子中的原子量子理论 (QTAIM) 分析.

主要成果:

  • 合成了三种新的二氧化复合物 (1-3).
  • 复合体1和2采用了二维结构.
  • 第一个组2金属/TMS复合物 (4-6) 是通过用n-,n-hexane或四甲基 (TMS) 处理复合物1而形成的.
  • 结构分析证实了4-6复合物的配方.
  • DFT计算表明/TMS与碎片之间的结合较弱,与过渡金属复合物相比.
  • 发现静电相互作用是主要的结合元件 (约. 65%),其中分散的贡献很大 (约. 20%) 和轨道相互作用 (约. 这是一个很大的问题.

结论:

  • 该研究报告了第2组金属/TMS复合物的第一个例子.
  • 这些复合物的结合是静电,分散和轨道相互作用的结合.
  • 脂性协调口袋影响分散力,从/TMS向的电荷流有助于轨道相互作用.