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相关概念视频

Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Coordination Number and Geometry02:57

Coordination Number and Geometry

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.
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
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...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

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相关实验视频

Updated: Jun 25, 2026

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
08:15

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

Published on: February 11, 2012

由[GdMo(12) O(42) ](9-) 离子和九个协调的Gd(III) 离子组成的新型三维框架的热水组合.

Chuan-De Wu1, Can-Zhong Lu, Hong-Hui Zhuang

  • 1The State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.

Journal of the American Chemical Society
|April 11, 2002
PubMed
概括
此摘要是机器生成的。

研究人员在异构聚合物化学中使用加多 (Gd) 合成了一种新的3D框架. 这种偏磁性兰坦化物为Silverton型离子引入了独特的磁性和结构复杂性.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

An Aptamer-based Sensor for Unchelated Gadolinium(III)
05:15

An Aptamer-based Sensor for Unchelated Gadolinium(III)

Published on: January 9, 2017

相关实验视频

Last Updated: Jun 25, 2026

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
08:15

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

Published on: February 11, 2012

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

An Aptamer-based Sensor for Unchelated Gadolinium(III)
05:15

An Aptamer-based Sensor for Unchelated Gadolinium(III)

Published on: January 9, 2017

科学领域:

  • 无机化学 无机化学 有机化学
  • 材料科学 材料科学 材料科学
  • 固态化学 固态化学

背景情况:

  • 异多聚聚酸盐是复杂的无机离子,具有多样化的结构和应用.
  • 兰化物离子,特别是像加多 (Gd) 这样的偏磁性离子,具有独特的磁性和协调性质.
  • 西尔弗顿型结构是一种特定的多氧甲酸框架.

研究的目的:

  • 合成和描述一种新型的三维框架,将一个偏磁性兰坦化物 (Gd) 纳入一个西尔弗顿型异多重聚合物.
  • 为了研究Gd(III) 在异多聚聚合基结构中的协调行为.
  • 为了探索产生的材料的磁性特性.

主要方法:

  • 使用热水合成来制造晶体材料.
  • 使用X射线衍射来确定三维框架结构.
  • 使用磁感应度测量和电子磁共振 (EPR) 光谱来研究磁性行为.

主要成果:

  • 一个新的3D框架, [Gd(H(2) O) ((3))) ((3)) [GdMo(12) O(42) ]·3H(2) O,已成功合成.
  • 该结构由9个协调的Gd(III) 阴离子连接在一起的Silverton型离子组成.
  • 参磁性Gd(III) 阴离子首次被引入到西尔弗顿型阴离子中心.
  • 磁性易受性表明弱反铁磁性行为,归因于O-Mo-O单位转换,由EPR证实.

结论:

  • 将偏磁性Gd(III) 纳入Silverton类型的异多聚聚聚酸框架,产生了一个新的3D结构.
  • 这项研究表明,胺离子成功地集成到聚氧甲酸盐化学中,扩大了结构多样性.
  • 观察到的弱反铁磁性行为为材料内的电子相互作用提供了洞察力.