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相关概念视频

Formation of Complex Ions03:45

Formation of Complex Ions

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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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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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

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

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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,...
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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一个单金属双体复合体

Madeleine C Levis1, Monte L Helm1,2, John F C Turner1

  • 1Department of Chemistry, University of Sussex, Brighton, UK.

Chemistry (Weinheim an der Bergstrasse, Germany)
|May 10, 2024
PubMed
概括
此摘要是机器生成的。

研究人员合成和表征了第一个bis ((cyaphido) 复合体,转-[Ru ((dppe) 2(CP) 2]. 这项工作证明了在复合体中多个cyapido配体的稳定性和合成可访问性.

关键词:
协调化学 协调化学化是一种化物.化物化物 化物鲁是的元素之一.结构的结构结构的结构.

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科学领域:

  • 有机金属化学 有机金属化学
  • 协调化学 协调化学
  • 酸盐化学 酸盐化学

背景情况:

  • 酸连接体 (CP) 是新型含的酸连接体 (CN) 的类似物.
  • 锡亚菲多连接体的协调化学和电子特性尚未得到充分理解.
  • 之前的研究主要集中在单基亚菲多复合物上.

研究的目的:

  • 合成和表征第一个bis ((cyaphido) 复合体.
  • 为了研究具有多个cyapido连接体的复合物的合成可访问性和稳定性.
  • 为了比较ciaphido和cyano配体的电子特性.

主要方法:

  • 通过Me3SiCP的协调和脱离,从[Ru(dppe) 2CP]+中合成转化[Ru(dppe) 2CP的合成.
  • 从相同的阳离子和NaCN中合成异构体模拟物trans-[Ru(dppe) 2(CN) ((CP) ].
  • 使用X射线晶体学和光谱学方法合成的复合物的结构特征.

主要成果:

  • 第一个双 (cyaphido) 复合体,转-[Ru(dppe) 2(CP) 2,已成功合成和表征.
  • 这项研究表明了携带多个cyapido连接体的鲁复合物的合成可行性和稳定性.
  • 直接比较显示,与蓝配体相比,赛亚菲多配体表现出增强的π-酸度和更高的π-捐赠者特征.

结论:

  • 双 (Bis(cyaphido) 复合体是合成可获得的和稳定的.
  • 与其同类电子同类物 - - 色体相比,色体具有独特的电子特性.
  • 这项工作扩大了有机金属化学的范围,涉及含的配体.