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相关概念视频

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

501
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...
8.5K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.7K
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...
20.7K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

363
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...
363
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.4K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
41.4K
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

28.1K
Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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Updated: Jun 24, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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一个化玻利离子.

Christopher Major1, Alan Lough1, Douglas W Stephan1,2

  • 1Department of Chemistry, University of Toronto, 80 St George St, Toronto, ON, M5S3H6, Canada. dstephan@chem.utoronto.ca.

Dalton transactions (Cambridge, England : 2003)
|June 10, 2024
PubMed
概括
此摘要是机器生成的。

研究人员通过一种新的反应途径合成了罕见的双坐标酸,特别是盐. 这些含有庞大的有机组的化合物被分离和结构确认,进步了低协调物种的化学结构.

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Expression, Solubilization, and Purification of Eukaryotic Borate Transporters
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Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry
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科学领域:

  • 无机化学 无机化学 有机化学
  • 有机化学 有机化学
  • 合成化学 合成化学

背景情况:

  • 由于其固有的不稳定性,双坐标离子是非常罕见的.
  • 之前的研究已经探索了各种途径来稳定低坐标的物种,但可分离的阴离子形式仍然难以捉摸.

研究的目的:

  • 合成和表征新的两个坐标的离子.
  • 为了探索三化物 (BF3) 与硬质阻碍的二化的反应性.
  • 为了分离和结构阐明稳定的盐.

主要方法:

  • BF3与硬质要求高的二化二化物,[RNSiMe2CH2]2B-Li+ (R=Dipp,1-Ad) 的反应.
  • 从中间体[RNSiMe2CH2]2BF中提取化物,使用一个非协调性离子,B(C6F5)4-.
  • 由此产生的盐的结晶学表征,[(RNSiMe2CH2) 2B][B(C6F5) 4].

主要成果:

  • 成功合成了两个坐标的离子前体[RNSiMe2CH2]2BF.
  • 稳定的盐的生成和分离,[{RNSiMe2CH2) 2B][B{C6F5) 4],具有庞大的Dipp和1-Ad替代剂.
  • 单晶X射线衍射证实了分离的盐的分子结构.

结论:

  • 这项研究证明了一条可行的合成途径,以获得罕见的双坐标离子.
  • 由R组 (Dipp,1-Ad) 提供的绝缘散体对于这些盐的分离和稳定性至关重要.
  • 这项工作扩大了已知的低坐标化合物的范围,并为未来的研究提供了基础.