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相关概念视频

Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

Bond Polarity
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Valence Bond Theory02:42

Valence Bond Theory

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...
Chemical Bonds02:40

Chemical Bonds


Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
Types of Chemical Bonds
An ionic bond is formed due to electrostatic attraction between cations and anions. Often, the ions are formed by the transfer of electrons from...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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

Complexation Equilibria: Factors Influencing Stability of Complexes

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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相关实验视频

Updated: Jul 6, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

在三价乙化物和兰坦化物离子复合体中的共价性比较.

Mark P Jensen1, Andrew H Bond

  • 1Chemistry Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA. mjensen@anl.gov

Journal of the American Chemical Society
|August 15, 2002
PubMed
概括

在液体-液体提取过程中,二甲二四三乙烯酸对三价性活性化物具有较高的选择性,而不是丁化物. 这种选择性来自于独特的协调化学,形成中性双酸复合体,没有内部球体水或酸盐.

科学领域:

  • 在f元素的协调化学.
  • 分离科学 分离科学
  • 放射化学 放射化学是指辐射化学.

背景情况:

  • 三价乙化物和化物离子在化学上是相似的,这给分离带来了挑战.
  • 二甲二,四,四三甲二) 酸衍生物用于液体液体提取.
  • 了解带协调是选择性分离的关键.

研究的目的:

  • 为了研究含有f元素的酸盐,单酸盐和二酸盐连接体的协调模式.
  • 阐明驱动dithiophosphinate对动因子的选择性的化学相互作用.
  • 为了比较actinide和lanthanide复合物的结构性质.

主要方法:

  • 可见吸收光谱学可见吸收光谱学
  • 测量X射线吸收细结构 (XAFS) 测量
  • 在n-多德干中研究Am(III),Cm(III),Nd(III) 和Sm(III) 复合物.

主要成果:

  • 酸盐连接体以键二极体 (M(HL2)3) 的形式协调.
  • 单基酸盐连接物通过氧和/或硫结合,作为双酸盐或单酸盐.
  • 滴酸盐连接物形成中性双酸复合物 (ML3),没有内球酸盐或水.

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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
07:49

Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy

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Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange
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Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange

Published on: June 23, 2023

相关实验视频

Last Updated: Jul 6, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
07:49

Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy

Published on: February 20, 2020

Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange
04:51

Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange

Published on: June 23, 2023

  • XAFS数据显示,类似大小的活性化物和化物离子的结构和键距离无法区分.

    • 结论:

    • 滴酸盐连接体对三价性活性化物的选择性源于其协调模式,形成中性双质复合体.
    • 尽管有结构上的相似之处,但协调的微妙差异导致了动因类选择性.
    • 这项研究提供了对选择性f元素分离机制的见解.