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相关概念视频

Valence Bond Theory02:42

Valence Bond Theory

8.9K
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...
8.9K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.5K
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...
47.5K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.5K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.4K
Coordination Number and Geometry02:57

Coordination Number and Geometry

15.6K
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.
15.6K
Structural Isomerism02:34

Structural Isomerism

16.8K
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,...
16.8K

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相关实验视频

Updated: May 2, 2026

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers

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两个四-Cd(II) 替代的瓦纳多格兰酸框架.

Jian Zhou1, Jun-Wei Zhao, Qi Wei

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

Journal of the American Chemical Society
|March 20, 2014
PubMed
概括
此摘要是机器生成的。

合成了两种具有替代性的新3D瓦纳多格尔曼酸框架. 这些独特的有机-无机混合结构展示了前所未有的集群外,并揭示了中心的反铁磁合.

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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

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相关实验视频

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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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科学领域:

  • 无机化学 无机化学
  • 材料科学 材料科学 材料科学
  • 晶体工程公司 晶体工程公司

背景情况:

  • 瓦纳多格曼酸盐是一种新兴的无机材料类,具有多样化的结构和特性.
  • 开发包含过渡金属和有机连接剂的新型3D框架对于先进的材料设计至关重要.

研究的目的:

  • 为了合成和表征新的四 ((II) 替代的瓦纳多格尔曼酸框架.
  • 阐明这些新型材料的独特结构特征和建筑单元.
  • 为了研究由过渡金属中心产生的磁性特性.

主要方法:

  • 热水合成的热水合成
  • 单晶X射线 difraktion 的使用方法.
  • 红外光谱学 红外光谱学 红外光谱学
  • 基本面分析 基本面分析
  • 粉末X射线衍射 (PXRD) 的方法
  • 能量分散式X射线光谱学 (EDX)
  • 在X射线光电子光谱学 (XPS) 中.
  • 热重力测量分析 (TGA)
  • 磁性测量 磁性测量 磁性测量

主要成果:

  • 成功合成了两个同型的3D瓦纳多格曼酸框架,{(CdX) 4Ge8V(IV) 10O46(H2O) [V(III) ((H2O) 2) 4(GeO2) 4}·8H2O (X =乙烯基二胺 (en, 1) 和1,2-二氨基 (dap, 2)).
  • 这些框架具有前所未有的3D有机-无机混合结构,由大型过渡金属替代的瓦纳多格尔曼酸团外构建,由格尔曼酸四面体和罕见的V (III) 集群连接在一起.
  • 磁性研究表明,框架内的中心之间存在抗铁磁性合.

结论:

  • 这些复杂的vanadogermanate框架的成功合成扩大了已知的无机有机混合材料的图书馆.
  • 独特的结构图案和多种过渡金属氧化状态的存在为进一步的功能化和应用提供了潜力.
  • 观察到的反铁磁行为为这些新型材料中的磁相互作用提供了洞察力.