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相关概念视频

Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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...
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...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

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相关实验视频

Updated: Jul 12, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

半桥式碳酸的电子密度. 通过实验和理论研究观察到的CO联体的转化[FeCo (((CO) ((8)) ] (((-)

Piero Macchi1, Luigi Garlaschelli, Angelo Sironi

  • 1Dipartimento di Chimica Strutturale e Stereochimica Inorganica, Università di Milano, via Venezian 21, 20133 Milan, Italy. piero@csmtbo.mi.cnr.it

Journal of the American Chemical Society
|November 21, 2002
PubMed
概括

研究人员使用X射线衍射和量子化学研究过渡金属二元中的电子密度. 他们解释了碳联体如何从终端转变为桥梁位置,揭示了关键的分子相互作用.

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In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
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Published on: February 1, 2020

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
08:40

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
11:38

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
08:40

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

科学领域:

  • 无机化学 无机化学
  • 固态化学 固态化学
  • 计算化学计算化学

背景情况:

  • 过渡金属二极体与碳联体在催化过程中至关重要.
  • 了解连接体协调是控制反应性的关键.
  • 电子密度分布决定了分子结构和结合.

研究的目的:

  • 确定过渡金属二元体中的电子密度分布,其中含有半桥式碳基.
  • 描述碳基协调从终端到桥梁的演变.
  • 为了解释在固态中观察到的形状连续.

主要方法:

  • 实验性的X射线衍射.
  • 量子化学计算 量子化学计算
  • 结构相关性类似的方法.
  • 分子中的原子量子理论 (QTAIM) 分析.

主要成果:

  • 成功确定了电子密度分布.
  • 观察并解释了一种平滑的形状连续.
  • 原子间移位指数的特征是M-M,M-CO和M- - - M的相互作用.

结论:

  • 这项研究提供了对过渡金属碳酸的电子结构的见解.
  • 直接和间接相互作用的相互作用决定了连接体协调.
  • 这项工作促进了对有机金属复合物的结合的理解.