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相关概念视频

Stereoisomerism02:52

Stereoisomerism

11.7K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.7K
Coordination Number and Geometry02:57

Coordination Number and Geometry

15.5K
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.
15.5K
Structural Isomerism02:34

Structural Isomerism

19.1K
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...
19.1K
Valence Bond Theory02:42

Valence Bond Theory

8.4K
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...
8.4K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

2.6K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
2.6K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.1K
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...
26.1K

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相关实验视频

Updated: May 29, 2025

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

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在2D霍夫曼型协调聚合物中切换多重功能通道.

Xin-Feng Li1, Nian-Tao Yao2, Zhen Shao1

  • 1State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, No.2 Linggong Road, Dalian 116024, China.

Inorganic chemistry
|February 5, 2025
PubMed
概括
此摘要是机器生成的。

使用新型霍夫曼型协调聚合物开发了刺激响应旋转交叉 (SCO) 材料. 这些材料表现出合的磁性和介电过渡,以及发光,为先进的分子设备铺平了道路.

更多相关视频

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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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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相关实验视频

Last Updated: May 29, 2025

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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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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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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科学领域:

  • 材料科学 材料科学 材料科学
  • 协调化学 协调化学
  • 超分子化学 超分子化学

背景情况:

  • 旋转交叉 (SCO) 材料为信息存储和智能设备提供了潜力.
  • 在SCO材料中集成多种功能仍然是一个重大挑战.
  • 霍夫曼类型协调聚合物 (HTCPs) 因其调节性特性而受到探索.

研究的目的:

  • 为了合成和表征基于2D Fe (II) 的新型HTCP,其中包含光配体.
  • 为了研究合成复合物的旋转交叉,介电和发光性质.
  • 探索多功能应用中SCO和发光之间的协同合.

主要方法:

  • 两维霍夫曼型协调聚合物的合成,使用特定的铁前体和光配体 (aep和avp).
  • 通过磁性和介电测量来描述旋转交叉行为.
  • 可变温度光谱学用于研究发光性质及其与SCO的相关性.

主要成果:

  • 成功合成了两种基于Fe (II) 的新型HTCP,即{Fe (aep) 2[Ag (CN) 2}·0.3DMF (1) 和{Fe (avp) 2[Ag (CN) 2} (2),这些新型HTCP是基于Fe (II) 的.
  • 这两种复合体都在216 K (1) 和255 K (2) 呈现一阶段旋转交叉过渡,具有相应的介电过渡.
  • 观察到共存的SCO和发光,由于SCO中心和光体的邻近,在2号综合体中增强了协同合.

结论:

  • 开发的HTCP证明了刺激响应SCO和发光的成功整合.
  • 观察到的合磁性和介电过渡突出显示了它们在传感应用中的潜力.
  • 这些发现使HTCPs成为设计下一代基于分子的多功能设备的多功能平台.