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相关概念视频

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.
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...

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相关实验视频

Updated: Jul 7, 2026

Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples
09:42

Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples

Published on: August 7, 2016

在X射线吸收光谱学和密度函数理论研究中,研究了[(H3buea) FeIII-X]n- (X = S2-, O2-, OH-):比较了氧化和硫化复合体中的结合和结合.

Abhishek Dey1, Rosalie K Hocking, Peter Larsen

  • 1Department of Chemistry, Stanford University, Stanford, California 94305, USA.

Journal of the American Chemical Society
|July 27, 2006
PubMed
概括

铁K边缘和L边缘X射线吸收光谱显示,由于离子贡献较大,Fe (III) -O键比Fe (III) -S键更强. 与硫化物复合物相比,氧化物复合物中的键显著更强.

更多相关视频

Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
07:55

Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering

Published on: April 17, 2018

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

相关实验视频

Last Updated: Jul 7, 2026

Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples
09:42

Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples

Published on: August 7, 2016

Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
07:55

Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering

Published on: April 17, 2018

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

科学领域:

  • 无机化学 无机化学
  • 材料科学 材料科学 材料科学
  • 计算化学的计算化学

背景情况:

  • 在无机化学中,了解金属-连接体相互作用至关重要.
  • 射线吸收光谱 (XAS) 提供了对电子结构和结合的洞察.
  • 密度函数理论 (DFT) 是模拟化学系统的强大工具.

研究的目的:

  • 研究铁复合体中的电子结构和与氧和硫化连接物的结合.
  • 用实验和计算方法比较Fe-O和Fe-S键的强度和性质.
  • 为了评估结对这些铁复合物的影响.

主要方法:

  • 在铁L边缘,铁K边缘和硫K边缘进行X射线吸收光谱 (XAS).
  • 密度函数理论 (DFT) 的计算.
  • 实验电子结构与理论模型的相关性.

主要成果:

  • 实验电子结构与DFT计算一致.
  • 发现Fe (III) -O键比Fe (III) -S键更强,尽管对应性较低.
  • 与硫化物联体 (-12 kcal / mol) 相比,氧联体 (-25 kcal / mol) 的结能明显高于硫联体 (-12 kcal / mol).
  • 由于Fe(IV) -O键的共价性质,与Fe(III) -O相比,与Fe(IV) -O的键的关系不那么有利.

结论:

  • 金属结合体键的强度受到离子和共价贡献的影响.
  • 在这些铁复合体中,氧联体表现出比硫化联体更强的结相互作用.
  • 电子结构和粘合特性随着铁的氧化状态发生显著变化.