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相关概念视频

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.
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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.
Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
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...

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相关实验视频

Updated: Jun 7, 2026

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
11:04

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Published on: September 7, 2019

一个阳离子,四角铜(II) 超氧化物复合体.

Patrick J Donoghue1, Aalo K Gupta, David W Boyce

  • 1Department of Chemistry, Supercomputing Institute, and Center for Metals in Biocatalysis, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, USA.

Journal of the American Chemical Society
|October 28, 2010
PubMed
概括
此摘要是机器生成的。

研究人员发现了一种新的铜 (II) -超氧化物复合物. 这种复杂的,具有阻碍的pyridinedicarboxamide连接体,在反应中表现出独特的基本特性,为氧化催化中间体提供了新的见解.

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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

科学领域:

  • 生物有机化学 生物有机化学
  • 协调化学 协调化学
  • 催化剂是一种催化剂.

背景情况:

  • 铜氧物种是各种氧化催化反应中的关键中间体.
  • 了解这些中间体的结构和反应性是设计高效催化剂的关键.
  • 之前的研究已经探索了铜-超氧化物复合体,但它们的精确作用和行为仍然是积极调查的领域.

研究的目的:

  • 为了识别和描述一种新的铜 (II) -超氧化物复合物.
  • 为了阐明这个复杂的结构和电子特性.
  • 为了研究它的反应性,特别是与已知的超氧化铜物种相比.

主要方法:

  • 一个铜 (II) - 超氧化物复合物的合成,由一个被固体阻碍的pyridinedicarboxamide连接体支持.
  • 使用UV-vis,NMR,EPR和共振拉曼光谱的光谱学表征.
  • 密度函数理论 (DFT) 的计算,以提出复杂的结构.
  • 反应性研究涉及与铜 (I) 前体和的反应.

主要成果:

  • 确定一个稳定的Cu(II) - 超氧化物复合物,并提出一个四角形的,末端的超氧化物结构.
  • 光谱数据 (UV-vis,NMR,EPR,共振拉曼) 和DFT计算支持了拟议的结构.
  • 该复合物与[{tmpa}Cu{CH3CN}]OTf反应,形成一个转-1,2-氧铜{II}物种.
  • 在与的反应中,该复合物作为基体起作用,与其他已知的Cu (II) - 超氧化物复合物不同,这些复合物作为电友作用.

结论:

  • 一种新的Cu (II) - 超氧化物复合物已成功合成和表征.
  • 这些发现为氧化催化过程中铜氧中间体的性质提供了宝贵的见解.
  • 这个复合物的独特的基本反应性为催化应用和机械学研究开辟了新的途径.